✨ Core Features

PublishedJan 14, 2026

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Langfuse Is Doubling Down On Open Source

Langfuse Cloud · Self Host · Demo

Docs · Report Bug · Feature Request · Changelog · Roadmap ·

Langfuse uses GitHub Discussions for Support and Feature Requests.
We're hiring. Join us in product engineering and technical go-to-market roles.

Langfuse is an open source LLM engineering platform. It helps teams collaboratively develop, monitor, evaluate, and debug AI applications. Langfuse can be self-hosted in minutes and is battle-tested.

✨ Core Features

LLM Application Observability: Instrument your app and start ingesting traces to Langfuse, thereby tracking LLM calls and other relevant logic in your app such as retrieval, embedding, or agent actions. Inspect and debug complex logs and user sessions. Try the interactive demo to see this in action.
Prompt Management helps you centrally manage, version control, and collaboratively iterate on your prompts. Thanks to strong caching on server and client side, you can iterate on prompts without adding latency to your application.
Evaluations are key to the LLM application development workflow, and Langfuse adapts to your needs. It supports LLM-as-a-judge, user feedback collection, manual labeling, and custom evaluation pipelines via APIs/SDKs.
Datasets enable test sets and benchmarks for evaluating your LLM application. They support continuous improvement, pre-deployment testing, structured experiments, flexible evaluation, and seamless integration with frameworks like LangChain and LlamaIndex.
LLM Playground is a tool for testing and iterating on your prompts and model configurations, shortening the feedback loop and accelerating development. When you see a bad result in tracing, you can directly jump to the playground to iterate on it.
Comprehensive API: Langfuse is frequently used to power bespoke LLMOps workflows while using the building blocks provided by Langfuse via the API. OpenAPI spec, Postman collection, and typed SDKs for Python, JS/TS are available.

📦 Deploy Langfuse

Langfuse Cloud

Managed deployment by the Langfuse team, generous free-tier, no credit card required.

Self-Host Langfuse

Run Langfuse on your own infrastructure:

Local (docker compose): Run Langfuse on your own machine in 5 minutes using Docker Compose.

# Get a copy of the latest Langfuse repository
git clone https://github.com/langfuse/langfuse.git
cd langfuse

# Run the langfuse docker compose
docker compose up

VM: Run Langfuse on a single Virtual Machine using Docker Compose.
Kubernetes (Helm): Run Langfuse on a Kubernetes cluster using Helm. This is the preferred production deployment.
Terraform Templates: AWS, Azure, GCP

See self-hosting documentation to learn more about architecture and configuration options.

🔌 Integrations

Main Integrations:

Integration	Supports	Description
SDK	Python, JS/TS	Manual instrumentation using the SDKs for full flexibility.
OpenAI	Python, JS/TS	Automated instrumentation using drop-in replacement of OpenAI SDK.
Langchain	Python, JS/TS	Automated instrumentation by passing callback handler to Langchain application.
LlamaIndex	Python	Automated instrumentation via LlamaIndex callback system.
Haystack	Python	Automated instrumentation via Haystack content tracing system.
LiteLLM	Python, JS/TS (proxy only)	Use any LLM as a drop in replacement for GPT. Use Azure, OpenAI, Cohere, Anthropic, Ollama, VLLM, Sagemaker, HuggingFace, Replicate (100+ LLMs).
Vercel AI SDK	JS/TS	TypeScript toolkit designed to help developers build AI-powered applications with React, Next.js, Vue, Svelte, Node.js.
Mastra	JS/TS	Open source framework for building AI agents and multi-agent systems.
API		Directly call the public API. OpenAPI spec available.

Packages integrated with Langfuse:

Name	Type	Description
Instructor	Library	Library to get structured LLM outputs (JSON, Pydantic)
DSPy	Library	Framework that systematically optimizes language model prompts and weights
Mirascope	Library	Python toolkit for building LLM applications.
Ollama	Model (local)	Easily run open source LLMs on your own machine.
Amazon Bedrock	Model	Run foundation and fine-tuned models on AWS.
AutoGen	Agent Framework	Open source LLM platform for building distributed agents.
Flowise	Chat/Agent UI	JS/TS no-code builder for customized LLM flows.
Langflow	Chat/Agent UI	Python-based UI for LangChain, designed with react-flow to provide an effortless way to experiment and prototype flows.
Dify	Chat/Agent UI	Open source LLM app development platform with no-code builder.
OpenWebUI	Chat/Agent UI	Self-hosted LLM Chat web ui supporting various LLM runners including self-hosted and local models.
Promptfoo	Tool	Open source LLM testing platform.
LobeChat	Chat/Agent UI	Open source chatbot platform.
Vapi	Platform	Open source voice AI platform.
Inferable	Agents	Open source LLM platform for building distributed agents.
Gradio	Chat/Agent UI	Open source Python library to build web interfaces like Chat UI.
Goose	Agents	Open source LLM platform for building distributed agents.
smolagents	Agents	Open source AI agents framework.
CrewAI	Agents	Multi agent framework for agent collaboration and tool use.

🚀 Quickstart

Instrument your app and start ingesting traces to Langfuse, thereby tracking LLM calls and other relevant logic in your app such as retrieval, embedding, or agent actions. Inspect and debug complex logs and user sessions.

1️⃣ Create new project

Create Langfuse account or self-host
Create a new project
Create new API credentials in the project settings

2️⃣ Log your first LLM call

The @observe() decorator makes it easy to trace any Python LLM application. In this quickstart we also use the Langfuse OpenAI integration to automatically capture all model parameters.

[!TIP] Not using OpenAI? Visit our documentation to learn how to log other models and frameworks.

pip install langfuse openai

LANGFUSE_SECRET_KEY="sk-lf-..."
LANGFUSE_PUBLIC_KEY="pk-lf-..."
LANGFUSE_BASE_URL="https://cloud.langfuse.com" # 🇪🇺 EU region
# LANGFUSE_BASE_URL="https://us.cloud.langfuse.com" # 🇺🇸 US region

from langfuse import observe
from langfuse.openai import openai # OpenAI integration

@observe()
def story():
    return openai.chat.completions.create(
        model="gpt-4o",
        messages=[{"role": "user", "content": "What is Langfuse?"}],
    ).choices[0].message.content

@observe()
def main():
    return story()

main()

3️⃣ See traces in Langfuse

See your language model calls and other application logic in Langfuse.

Public example trace in Langfuse

[!TIP]

Learn more about tracing in Langfuse or play with the interactive demo.

⭐️ Star Us

star-langfuse-on-github

💭 Support

Finding an answer to your question:

Our documentation is the best place to start looking for answers. It is comprehensive, and we invest significant time into maintaining it. You can also suggest edits to the docs via GitHub.
Langfuse FAQs where the most common questions are answered.
Use "Ask AI" to get instant answers to your questions.

Support Channels:

Ask any question in our public Q&A on GitHub Discussions. Please include as much detail as possible (e.g. code snippets, screenshots, background information) to help us understand your question.
Request a feature on GitHub Discussions.
Report a Bug on GitHub Issues.
For time-sensitive queries, ping us via the in-app chat widget.

🤝 Contributing

Your contributions are welcome!

Vote on Ideas in GitHub Discussions.
Raise and comment on Issues.
Open a PR - see CONTRIBUTING.md for details on how to setup a development environment.

🥇 License

This repository is MIT licensed, except for the ee folders. See LICENSE and docs for more details.

⭐️ Star History

❤️ Open Source Projects Using Langfuse

Top open-source Python projects that use Langfuse, ranked by stars (Source):

Repository	Stars
langflow-ai / langflow	116251
open-webui / open-webui	109642
abi / screenshot-to-code	70877
lobehub / lobe-chat	65454
infiniflow / ragflow	64118
firecrawl / firecrawl	56713
run-llama / llama_index	44203
FlowiseAI / Flowise	43547
QuivrHQ / quivr	38415
microsoft / ai-agents-for-beginners	38012
chatchat-space / Langchain-Chatchat	36071
mindsdb / mindsdb	35669
BerriAI / litellm	28726
onlook-dev / onlook	22447
NixOS / nixpkgs	21748
kortix-ai / suna	17976
anthropics / courses	17057
mastra-ai / mastra	16484
langfuse / langfuse	16054
Canner / WrenAI	11868
promptfoo / promptfoo	8350
The-Pocket / PocketFlow	8313
OpenPipe / ART	7093
topoteretes / cognee	7011
awslabs / agent-squad	6785
BasedHardware / omi	6231
hatchet-dev / hatchet	6019
zenml-io / zenml	4873
refly-ai / refly	4654
coleam00 / ottomator-agents	4165
JoshuaC215 / agent-service-toolkit	3557
colanode / colanode	3517
VoltAgent / voltagent	3210
bragai / bRAG-langchain	3010
pingcap / autoflow	2651
sourcebot-dev / sourcebot	2570
open-webui / pipelines	2055
YFGaia / dify-plus	1734
TheSpaghettiDetective / obico-server	1687
MLSysOps / MLE-agent	1387
TIGER-AI-Lab / TheoremExplainAgent	1385
trailofbits / buttercup	1223
wassim249 / fastapi-langgraph-agent-production-ready-template	1200
alishobeiri / thread	1098
dmayboroda / minima	1010
zstar1003 / ragflow-plus	993
openops-cloud / openops	939
dynamiq-ai / dynamiq	927
xataio / agent	857
plastic-labs / tutor-gpt	845
trendy-design / llmchat	829
hotovo / aider-desk	781
opslane / opslane	719
wrtnlabs / autoview	688
andysingal / llm-course	643
theopenconversationkit / tock	587
sentient-engineering / agent-q	487
NicholasGoh / fastapi-mcp-langgraph-template	481
i-am-alice / 3rd-devs	472
AIDotNet / koala-ai	470
phospho-app / text-analytics-legacy	439
inferablehq / inferable	403
duoyang666 / ai_novel	397
strands-agents / samples	385
FranciscoMoretti / sparka	380
RobotecAI / rai	373
ElectricCodeGuy / SupabaseAuthWithSSR	370
LibreChat-AI / librechat.ai	339
souzatharsis / tamingLLMs	323
aws-samples / aws-ai-ml-workshop-kr	295
weizxfree / KnowFlow	285
zenml-io / zenml-projects	276
wxai-space / LightAgent	275
Ozamatash / deep-research-mcp	269
sql-agi / DB-GPT	241
guyernest / advanced-rag	238
bklieger-groq / mathtutor-on-groq	233
plastic-labs / honcho	224
OVINC-CN / OpenWebUI	202
zhutoutoutousan / worldquant-miner	202
iceener / ai	186
giselles-ai / giselle	181
ai-shifu / ai-shifu	181
aws-samples / sample-serverless-mcp-servers	175
celerforge / freenote	171
babelcloud / LLM-RGB	164
8090-inc / xrx-sample-apps	163
deepset-ai / haystack-core-integrations	163
codecentric / c4-genai-suite	152
XSpoonAi / spoon-core	150
chatchat-space / LangGraph-Chatchat	144
langfuse / langfuse-docs	139
piyushgarg-dev / genai-cohort	135
i-dot-ai / redbox	132
bmd1905 / ChatOpsLLM	127
Fintech-Dreamer / FinSynth	121
kenshiro-o / nagato-ai	119

🔒 Security & Privacy

We take data security and privacy seriously. Please refer to our Security and Privacy page for more information.

Telemetry

By default, Langfuse automatically reports basic usage statistics of self-hosted instances to a centralized server (PostHog).

This helps us to:

Understand how Langfuse is used and improve the most relevant features.
Track overall usage for internal and external (e.g. fundraising) reporting.

None of the data is shared with third parties and does not include any sensitive information. We want to be super transparent about this and you can find the exact data we collect here.

You can opt-out by setting TELEMETRY_ENABLED=false.

Contents

Prompt Playground

7 Variables

Fill Variables

AWS

GCP

SDK

API

LICENSE

ART

Preview

<img width="4856" height="1000" alt="github-banner" src="https://github.com/user-attachments/assets/6f435ef3-1194-4e26-87af-aa13826bbb5f" />

<div align="center">
   <div>
      <h3>
        <a href="https://langfuse.com/blog/2025-06-04-open-sourcing-langfuse-product">
            <strong>Langfuse Is Doubling Down On Open Source</strong>
         </a> <br> <br>
         <a href="https://cloud.langfuse.com">
            <strong>Langfuse Cloud</strong>
         </a> · 
         <a href="https://langfuse.com/docs/deployment/self-host">
            <strong>Self Host</strong>
         </a> · 
         <a href="https://langfuse.com/demo">
            <strong>Demo</strong>
         </a>
      </h3>
   </div>

   <div>
      <a href="https://langfuse.com/docs"><strong>Docs</strong></a> ·
      <a href="https://langfuse.com/issues"><strong>Report Bug</strong></a> ·
      <a href="https://langfuse.com/ideas"><strong>Feature Request</strong></a> ·
      <a href="https://langfuse.com/changelog"><strong>Changelog</strong></a> ·
      <a href="https://langfuse.com/roadmap"><strong>Roadmap</strong></a> ·
   </div>
   <br/>
   <span>Langfuse uses <a href="https://github.com/orgs/langfuse/discussions"><strong>GitHub Discussions</strong></a>  for Support and Feature Requests.</span>
   <br/>
   <span><b>We're hiring.</b> <a href="https://langfuse.com/careers"><strong>Join us</strong></a> in product engineering and technical go-to-market roles.</span>
   <br/>
   <br/>
   <div>
   </div>
</div>

<p align="center">
   <a href="https://github.com/langfuse/langfuse/blob/main/LICENSE">
   <img src="https://img.shields.io/badge/License-MIT-E11311.svg" alt="MIT License">
   </a>
   <a href="https://www.ycombinator.com/companies/langfuse"><img src="https://img.shields.io/badge/Y%20Combinator-W23-orange" alt="Y Combinator W23"></a>
   <a href="https://hub.docker.com/u/langfuse" target="_blank">
   <img alt="Docker Pulls" src="https://img.shields.io/docker/pulls/langfuse/langfuse?labelColor=%20%23FDB062&logo=Docker&labelColor=%20%23528bff"></a>
   <a href="https://pypi.python.org/pypi/langfuse"><img src="https://img.shields.io/pypi/dm/langfuse?logo=python&logoColor=white&label=pypi%20langfuse&color=blue" alt="langfuse Python package on PyPi"></a>
   <a href="https://www.npmjs.com/package/langfuse"><img src="https://img.shields.io/npm/dm/langfuse?logo=npm&logoColor=white&label=npm%20langfuse&color=blue" alt="langfuse npm package"></a>
   <br/>
   <a href="https://discord.com/invite/7NXusRtqYU" target="_blank">
   <img src="https://img.shields.io/discord/1111061815649124414?logo=discord&labelColor=%20%235462eb&logoColor=%20%23f5f5f5&color=%20%235462eb"
      alt="chat on Discord"></a>
   <a href="https://twitter.com/intent/follow?screen_name=langfuse" target="_blank">
   <img src="https://img.shields.io/twitter/follow/langfuse?logo=X&color=%20%23f5f5f5"
      alt="follow on X(Twitter)"></a>
   <a href="https://www.linkedin.com/company/langfuse/" target="_blank">
   <img src="https://custom-icon-badges.demolab.com/badge/LinkedIn-0A66C2?logo=linkedin-white&logoColor=fff"
      alt="follow on LinkedIn"></a>
   <a href="https://github.com/langfuse/langfuse/graphs/commit-activity" target="_blank">
   <img alt="Commits last month" src="https://img.shields.io/github/commit-activity/m/langfuse/langfuse?labelColor=%20%2332b583&color=%20%2312b76a"></a>
   <a href="https://github.com/langfuse/langfuse/" target="_blank">
   <img alt="Issues closed" src="https://img.shields.io/github/issues-search?query=repo%3Alangfuse%2Flangfuse%20is%3Aclosed&label=issues%20closed&labelColor=%20%237d89b0&color=%20%235d6b98"></a>
   <a href="https://github.com/langfuse/langfuse/discussions/" target="_blank">
   <img alt="Discussion posts" src="https://img.shields.io/github/discussions/langfuse/langfuse?labelColor=%20%239b8afb&color=%20%237a5af8"></a>
   <a href="https://deepwiki.com/langfuse/langfuse" target="_blank">
   <img alt="Ask DeepWiki" src="https://deepwiki.com/badge.svg"></a>
</p>

<p align="center">
  <a href="./README.md"><img alt="README in English" src="https://img.shields.io/badge/English-d9d9d9"></a>
  <a href="./README.cn.md"><img alt="简体中文版自述文件" src="https://img.shields.io/badge/简体中文-d9d9d9"></a>
  <a href="./README.ja.md"><img alt="日本語のREADME" src="https://img.shields.io/badge/日本語-d9d9d9"></a>
  <a href="./README.kr.md"><img alt="README in Korean" src="https://img.shields.io/badge/한국어-d9d9d9"></a>
</p>

Langfuse is an **open source LLM engineering** platform. It helps teams collaboratively
**develop, monitor, evaluate,** and **debug** AI applications. Langfuse can be **self-hosted in minutes** and is **battle-tested**.

[![Langfuse Overview Video](https://github.com/user-attachments/assets/925d71db-6331-445e-8f3e-727ee95d1c9f)](https://langfuse.com/watch-demo)



## ✨ Core Features

<img width="4856" height="1944" alt="Langfuse Overview" src="https://github.com/user-attachments/assets/5dac68ef-d546-49fb-b06f-cfafc19282e3" />

- [LLM Application Observability](https://langfuse.com/docs/tracing): Instrument your app and start ingesting traces to Langfuse, thereby tracking LLM calls and other relevant logic in your app such as retrieval, embedding, or agent actions. Inspect and debug complex logs and user sessions. Try the interactive [demo](https://langfuse.com/docs/demo) to see this in action.

- [Prompt Management](https://langfuse.com/docs/prompt-management/get-started) helps you centrally manage, version control, and collaboratively iterate on your prompts. Thanks to strong caching on server and client side, you can iterate on prompts without adding latency to your application.

- [Evaluations](https://langfuse.com/docs/evaluation/overview) are key to the LLM application development workflow, and Langfuse adapts to your needs. It supports LLM-as-a-judge, user feedback collection, manual labeling, and custom evaluation pipelines via APIs/SDKs.

- [Datasets](https://langfuse.com/docs/evaluation/dataset-runs/datasets) enable test sets and benchmarks for evaluating your LLM application. They support continuous improvement, pre-deployment testing, structured experiments, flexible evaluation, and seamless integration with frameworks like LangChain and LlamaIndex.

- [LLM Playground](https://langfuse.com/docs/playground) is a tool for testing and iterating on your prompts and model configurations, shortening the feedback loop and accelerating development. When you see a bad result in tracing, you can directly jump to the playground to iterate on it.

- [Comprehensive API](https://langfuse.com/docs/api): Langfuse is frequently used to power bespoke LLMOps workflows while using the building blocks provided by Langfuse via the API. OpenAPI spec, Postman collection, and typed SDKs for Python, JS/TS are available.

## 📦 Deploy Langfuse

<img width="4856" height="1322" alt="Langfuse Deployment Options" src="https://github.com/user-attachments/assets/98f020c7-7a20-4264-a201-65c41a52a5d5" />

### Langfuse Cloud

Managed deployment by the Langfuse team, generous free-tier, no credit card required.

<div align="center">
    <a href="https://cloud.langfuse.com" target="_blank">
        <img alt="Static Badge" src="https://img.shields.io/badge/»%20Sign%20up%20for%20Langfuse%20Cloud-8A2BE2?&color=orange">
    </a>
</div>

### Self-Host Langfuse

Run Langfuse on your own infrastructure:

- [Local (docker compose)](https://langfuse.com/self-hosting/local): Run Langfuse on your own machine in 5 minutes using Docker Compose.

  ```bash
  # Get a copy of the latest Langfuse repository
  git clone https://github.com/langfuse/langfuse.git
  cd langfuse

  # Run the langfuse docker compose
  docker compose up
  ```

- [VM](https://langfuse.com/self-hosting/docker-compose): Run Langfuse on a single Virtual Machine using Docker Compose.
- [Kubernetes (Helm)](https://langfuse.com/self-hosting/kubernetes-helm): Run Langfuse on a Kubernetes cluster using Helm. This is the preferred production deployment.
- Terraform Templates: [AWS](https://langfuse.com/self-hosting/aws), [Azure](https://langfuse.com/self-hosting/azure), [GCP](https://langfuse.com/self-hosting/gcp)

See [self-hosting documentation](https://langfuse.com/self-hosting) to learn more about architecture and configuration options.

## 🔌 Integrations

<img width="4856" height="1322" alt="github-integrations" src="https://github.com/user-attachments/assets/e41ea0fb-742d-41ce-bf94-1d4fb95750cd" />

### Main Integrations:

| Integration                                                                  | Supports                   | Description                                                                                                                                      |
| ---------------------------------------------------------------------------- | -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------ |
| [SDK](https://langfuse.com/docs/sdk)                                         | Python, JS/TS              | Manual instrumentation using the SDKs for full flexibility.                                                                                      |
| [OpenAI](https://langfuse.com/integrations/model-providers/openai-py)        | Python, JS/TS              | Automated instrumentation using drop-in replacement of OpenAI SDK.                                                                               |
| [Langchain](https://langfuse.com/docs/integrations/langchain)                | Python, JS/TS              | Automated instrumentation by passing callback handler to Langchain application.                                                                  |
| [LlamaIndex](https://langfuse.com/docs/integrations/llama-index/get-started) | Python                     | Automated instrumentation via LlamaIndex callback system.                                                                                        |
| [Haystack](https://langfuse.com/docs/integrations/haystack)                  | Python                     | Automated instrumentation via Haystack content tracing system.                                                                                   |
| [LiteLLM](https://langfuse.com/docs/integrations/litellm)                    | Python, JS/TS (proxy only) | Use any LLM as a drop in replacement for GPT. Use Azure, OpenAI, Cohere, Anthropic, Ollama, VLLM, Sagemaker, HuggingFace, Replicate (100+ LLMs). |
| [Vercel AI SDK](https://langfuse.com/docs/integrations/vercel-ai-sdk)        | JS/TS                      | TypeScript toolkit designed to help developers build AI-powered applications with React, Next.js, Vue, Svelte, Node.js.                          |
| [Mastra](https://langfuse.com/docs/integrations/mastra)                      | JS/TS                      | Open source framework for building AI agents and multi-agent systems.                                                                             |
| [API](https://langfuse.com/docs/api)                                         |                            | Directly call the public API. OpenAPI spec available.                                                                                            |

### Packages integrated with Langfuse:

| Name                                                                    | Type               | Description                                                                                                             |
| ----------------------------------------------------------------------- | ------------------ | ----------------------------------------------------------------------------------------------------------------------- |
| [Instructor](https://langfuse.com/docs/integrations/instructor)         | Library            | Library to get structured LLM outputs (JSON, Pydantic)                                                                  |
| [DSPy](https://langfuse.com/docs/integrations/dspy)                     | Library            | Framework that systematically optimizes language model prompts and weights                                              |
| [Mirascope](https://langfuse.com/docs/integrations/mirascope)           | Library            | Python toolkit for building LLM applications.                                                                           |
| [Ollama](https://langfuse.com/docs/integrations/ollama)                 | Model (local)      | Easily run open source LLMs on your own machine.                                                                        |
| [Amazon Bedrock](https://langfuse.com/docs/integrations/amazon-bedrock) | Model              | Run foundation and fine-tuned models on AWS.                                                                            |
| [AutoGen](https://langfuse.com/docs/integrations/autogen)               | Agent Framework    | Open source LLM platform for building distributed agents.                                                               |
| [Flowise](https://langfuse.com/docs/integrations/flowise)               | Chat/Agent&nbsp;UI | JS/TS no-code builder for customized LLM flows.                                                                         |
| [Langflow](https://langfuse.com/docs/integrations/langflow)             | Chat/Agent&nbsp;UI | Python-based UI for LangChain, designed with react-flow to provide an effortless way to experiment and prototype flows. |
| [Dify](https://langfuse.com/docs/integrations/dify)                     | Chat/Agent&nbsp;UI | Open source LLM app development platform with no-code builder.                                                          |
| [OpenWebUI](https://langfuse.com/docs/integrations/openwebui)           | Chat/Agent&nbsp;UI | Self-hosted LLM Chat web ui supporting various LLM runners including self-hosted and local models.                      |
| [Promptfoo](https://langfuse.com/docs/integrations/promptfoo)           | Tool               | Open source LLM testing platform.                                                                                       |
| [LobeChat](https://langfuse.com/docs/integrations/lobechat)             | Chat/Agent&nbsp;UI | Open source chatbot platform.                                                                                           |
| [Vapi](https://langfuse.com/docs/integrations/vapi)                     | Platform           | Open source voice AI platform.                                                                                          |
| [Inferable](https://langfuse.com/docs/integrations/other/inferable)     | Agents             | Open source LLM platform for building distributed agents.                                                               |
| [Gradio](https://langfuse.com/docs/integrations/other/gradio)           | Chat/Agent&nbsp;UI | Open source Python library to build web interfaces like Chat UI.                                                        |
| [Goose](https://langfuse.com/docs/integrations/goose)                   | Agents             | Open source LLM platform for building distributed agents.                                                               |
| [smolagents](https://langfuse.com/docs/integrations/smolagents)         | Agents             | Open source AI agents framework.                                                                                        |
| [CrewAI](https://langfuse.com/docs/integrations/crewai)                 | Agents             | Multi agent framework for agent collaboration and tool use.                                                             |

## 🚀 Quickstart

Instrument your app and start ingesting traces to Langfuse, thereby tracking LLM calls and other relevant logic in your app such as retrieval, embedding, or agent actions. Inspect and debug complex logs and user sessions.

### 1️⃣ Create new project

1.  [Create Langfuse account](https://cloud.langfuse.com/auth/sign-up) or [self-host](https://langfuse.com/self-hosting)
2.  Create a new project
3.  Create new API credentials in the project settings

### 2️⃣ Log your first LLM call

The [`@observe()` decorator](https://langfuse.com/docs/sdk/python/decorators) makes it easy to trace any Python LLM application. In this quickstart we also use the Langfuse [OpenAI integration](https://langfuse.com/integrations/model-providers/openai-py) to automatically capture all model parameters.

> [!TIP]
> Not using OpenAI? Visit [our documentation](https://langfuse.com/docs/get-started#log-your-first-llm-call-to-langfuse) to learn how to log other models and frameworks.

```bash
pip install langfuse openai
```

```bash filename=".env"
LANGFUSE_SECRET_KEY="sk-lf-..."
LANGFUSE_PUBLIC_KEY="pk-lf-..."
LANGFUSE_BASE_URL="https://cloud.langfuse.com" # 🇪🇺 EU region
# LANGFUSE_BASE_URL="https://us.cloud.langfuse.com" # 🇺🇸 US region
```

```python /@observe()/ /from langfuse.openai import openai/ filename="main.py"
from langfuse import observe
from langfuse.openai import openai # OpenAI integration

@observe()
def story():
    return openai.chat.completions.create(
        model="gpt-4o",
        messages=[{"role": "user", "content": "What is Langfuse?"}],
    ).choices[0].message.content

@observe()
def main():
    return story()

main()
```

### 3️⃣ See traces in Langfuse

See your language model calls and other application logic in Langfuse.

<img width="1787" height="674" alt="Example trace in Langfuse" src="https://github.com/user-attachments/assets/f796eb78-dfb5-4570-b236-bdb4b67d4d55" />

_[Public example trace in Langfuse](https://cloud.langfuse.com/project/cloramnkj0002jz088vzn1ja4/traces/2cec01e3-3dc2-472f-afcf-3b968cf0c1f4?timestamp=2025-02-10T14%3A27%3A30.275Z&observation=cb5ff844-07ef-41e6-b8e2-6c64344bc13b)_

> [!TIP]
>
> [Learn more](https://langfuse.com/docs/tracing) about tracing in Langfuse or play with the [interactive demo](https://langfuse.com/docs/demo).

## ⭐️ Star Us

![star-langfuse-on-github](https://github.com/user-attachments/assets/79a1d816-d229-4526-aecc-097d4a19f1ad)

## 💭 Support

Finding an answer to your question:

- Our [documentation](https://langfuse.com/docs) is the best place to start looking for answers. It is comprehensive, and we invest significant time into maintaining it. You can also suggest edits to the docs via GitHub.
- [Langfuse FAQs](https://langfuse.com/faq) where the most common questions are answered.
- Use "[Ask AI](https://langfuse.com/docs/ask-ai)" to get instant answers to your questions.

Support Channels:

- **Ask any question in our [public Q&A](https://github.com/orgs/langfuse/discussions/categories/support) on GitHub Discussions.** Please include as much detail as possible (e.g. code snippets, screenshots, background information) to help us understand your question.
- [Request a feature](https://github.com/orgs/langfuse/discussions/categories/ideas) on GitHub Discussions.
- [Report a Bug](https://github.com/langfuse/langfuse/issues) on GitHub Issues.
- For time-sensitive queries, ping us via the in-app chat widget.

## 🤝 Contributing

Your contributions are welcome!

- Vote on [Ideas](https://github.com/orgs/langfuse/discussions/categories/ideas) in GitHub Discussions.
- Raise and comment on [Issues](https://github.com/langfuse/langfuse/issues).
- Open a PR - see [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to setup a development environment.

## 🥇 License

This repository is MIT licensed, except for the `ee` folders. See [LICENSE](LICENSE) and [docs](https://langfuse.com/docs/open-source) for more details.

## ⭐️ Star History

<a href="https://star-history.com/#langfuse/langfuse&Date">
 <picture>
   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=langfuse/langfuse&type=Date&theme=dark" />
   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=langfuse/langfuse&type=Date" />
   <img alt="Star History Chart" src="https://api.star-history.com/svg?repos=langfuse/langfuse&type=Date" style="border-radius: 15px;" />
 </picture>
</a>

## ❤️ Open Source Projects Using Langfuse

Top open-source Python projects that use Langfuse, ranked by stars ([Source](https://github.com/langfuse/langfuse-docs/blob/main/components-mdx/dependents)):

| Repository                                                                                                                                                                                                                                                                                                     |  Stars |
| :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -----: |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/85702467?s=40&v=4" width="20" height="20" alt=""> &nbsp; [langflow-ai](https://github.com/langflow-ai) / [langflow](https://github.com/langflow-ai/langflow)                                                                             | 116251 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/158137808?s=40&v=4" width="20" height="20" alt=""> &nbsp; [open-webui](https://github.com/open-webui) / [open-webui](https://github.com/open-webui/open-webui)                                                                           | 109642 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/23818?s=40&v=4" width="20" height="20" alt=""> &nbsp; [abi](https://github.com/abi) / [screenshot-to-code](https://github.com/abi/screenshot-to-code)                                                                                    |  70877 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/131470832?s=40&v=4" width="20" height="20" alt=""> &nbsp; [lobehub](https://github.com/lobehub) / [lobe-chat](https://github.com/lobehub/lobe-chat)                                                                                      |  65454 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/69962740?s=40&v=4" width="20" height="20" alt=""> &nbsp; [infiniflow](https://github.com/infiniflow) / [ragflow](https://github.com/infiniflow/ragflow)                                                                                  |  64118 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/135057108?s=40&v=4" width="20" height="20" alt=""> &nbsp; [firecrawl](https://github.com/firecrawl) / [firecrawl](https://github.com/firecrawl/firecrawl)                                                                                |  56713 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/130722866?s=40&v=4" width="20" height="20" alt=""> &nbsp; [run-llama](https://github.com/run-llama) / [llama_index](https://github.com/run-llama/llama_index)                                                                            |  44203 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/128289781?s=40&v=4" width="20" height="20" alt=""> &nbsp; [FlowiseAI](https://github.com/FlowiseAI) / [Flowise](https://github.com/FlowiseAI/Flowise)                                                                                    |  43547 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/159330290?s=40&v=4" width="20" height="20" alt=""> &nbsp; [QuivrHQ](https://github.com/QuivrHQ) / [quivr](https://github.com/QuivrHQ/quivr)                                                                                              |  38415 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/6154722?s=40&v=4" width="20" height="20" alt=""> &nbsp; [microsoft](https://github.com/microsoft) / [ai-agents-for-beginners](https://github.com/microsoft/ai-agents-for-beginners)                                                      |  38012 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/139558948?s=40&v=4" width="20" height="20" alt=""> &nbsp; [chatchat-space](https://github.com/chatchat-space) / [Langchain-Chatchat](https://github.com/chatchat-space/Langchain-Chatchat)                                               |  36071 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/31035808?s=40&v=4" width="20" height="20" alt=""> &nbsp; [mindsdb](https://github.com/mindsdb) / [mindsdb](https://github.com/mindsdb/mindsdb)                                                                                           |  35669 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/121462774?s=40&v=4" width="20" height="20" alt=""> &nbsp; [BerriAI](https://github.com/BerriAI) / [litellm](https://github.com/BerriAI/litellm)                                                                                          |  28726 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/157326433?s=40&v=4" width="20" height="20" alt=""> &nbsp; [onlook-dev](https://github.com/onlook-dev) / [onlook](https://github.com/onlook-dev/onlook)                                                                                   |  22447 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/487568?s=40&v=4" width="20" height="20" alt=""> &nbsp; [NixOS](https://github.com/NixOS) / [nixpkgs](https://github.com/NixOS/nixpkgs)                                                                                                   |  21748 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/170767358?s=40&v=4" width="20" height="20" alt=""> &nbsp; [kortix-ai](https://github.com/kortix-ai) / [suna](https://github.com/kortix-ai/suna)                                                                                          |  17976 |
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| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/149120496?s=40&v=4" width="20" height="20" alt=""> &nbsp; [mastra-ai](https://github.com/mastra-ai) / [mastra](https://github.com/mastra-ai/mastra)                                                                                      |  16484 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/134601687?s=40&v=4" width="20" height="20" alt=""> &nbsp; [langfuse](https://github.com/langfuse) / [langfuse](https://github.com/langfuse/langfuse)                                                                                     |  16054 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/7250217?s=40&v=4" width="20" height="20" alt=""> &nbsp; [Canner](https://github.com/Canner) / [WrenAI](https://github.com/Canner/WrenAI)                                                                                                 |  11868 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/137907881?s=40&v=4" width="20" height="20" alt=""> &nbsp; [promptfoo](https://github.com/promptfoo) / [promptfoo](https://github.com/promptfoo/promptfoo)                                                                                |   8350 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/193350244?s=40&v=4" width="20" height="20" alt=""> &nbsp; [The-Pocket](https://github.com/The-Pocket) / [PocketFlow](https://github.com/The-Pocket/PocketFlow)                                                                           |   8313 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/139012218?s=40&v=4" width="20" height="20" alt=""> &nbsp; [OpenPipe](https://github.com/OpenPipe) / [ART](https://github.com/OpenPipe/ART)                                                                                               |   7093 |
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| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/132635806?s=40&v=4" width="20" height="20" alt=""> &nbsp; [refly-ai](https://github.com/refly-ai) / [refly](https://github.com/refly-ai/refly)                                                                                           |   4654 |
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| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/185852128?s=40&v=4" width="20" height="20" alt=""> &nbsp; [colanode](https://github.com/colanode) / [colanode](https://github.com/colanode/colanode)                                                                                     |   3517 |
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| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/20493493?s=40&v=4" width="20" height="20" alt=""> &nbsp; [andysingal](https://github.com/andysingal) / [llm-course](https://github.com/andysingal/llm-course)                                                                            |    643 |
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| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/16997807?s=40&v=4" width="20" height="20" alt=""> &nbsp; [FranciscoMoretti](https://github.com/FranciscoMoretti) / [sparka](https://github.com/FranciscoMoretti/sparka)                                                                  |    380 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/66303003?s=40&v=4" width="20" height="20" alt=""> &nbsp; [RobotecAI](https://github.com/RobotecAI) / [rai](https://github.com/RobotecAI/rai)                                                                                             |    373 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/137044109?s=40&v=4" width="20" height="20" alt=""> &nbsp; [ElectricCodeGuy](https://github.com/ElectricCodeGuy) / [SupabaseAuthWithSSR](https://github.com/ElectricCodeGuy/SupabaseAuthWithSSR)                                          |    370 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/169401942?s=40&v=4" width="20" height="20" alt=""> &nbsp; [LibreChat-AI](https://github.com/LibreChat-AI) / [librechat.ai](https://github.com/LibreChat-AI/librechat.ai)                                                                 |    339 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/15125613?s=40&v=4" width="20" height="20" alt=""> &nbsp; [souzatharsis](https://github.com/souzatharsis) / [tamingLLMs](https://github.com/souzatharsis/tamingLLMs)                                                                      |    323 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/8931462?s=40&v=4" width="20" height="20" alt=""> &nbsp; [aws-samples](https://github.com/aws-samples) / [aws-ai-ml-workshop-kr](https://github.com/aws-samples/aws-ai-ml-workshop-kr)                                                    |    295 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/25676773?s=40&v=4" width="20" height="20" alt=""> &nbsp; [weizxfree](https://github.com/weizxfree) / [KnowFlow](https://github.com/weizxfree/KnowFlow)                                                                                   |    285 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/88676955?s=40&v=4" width="20" height="20" alt=""> &nbsp; [zenml-io](https://github.com/zenml-io) / [zenml-projects](https://github.com/zenml-io/zenml-projects)                                                                          |    276 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/136071305?s=40&v=4" width="20" height="20" alt=""> &nbsp; [wxai-space](https://github.com/wxai-space) / [LightAgent](https://github.com/wxai-space/LightAgent)                                                                           |    275 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/90278288?s=40&v=4" width="20" height="20" alt=""> &nbsp; [Ozamatash](https://github.com/Ozamatash) / [deep-research-mcp](https://github.com/Ozamatash/deep-research-mcp)                                                                 |    269 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/168552753?s=40&v=4" width="20" height="20" alt=""> &nbsp; [sql-agi](https://github.com/sql-agi) / [DB-GPT](https://github.com/sql-agi/DB-GPT)                                                                                            |    241 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/828269?s=40&v=4" width="20" height="20" alt=""> &nbsp; [guyernest](https://github.com/guyernest) / [advanced-rag](https://github.com/guyernest/advanced-rag)                                                                             |    238 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/175069511?s=40&v=4" width="20" height="20" alt=""> &nbsp; [bklieger-groq](https://github.com/bklieger-groq) / [mathtutor-on-groq](https://github.com/bklieger-groq/mathtutor-on-groq)                                                    |    233 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/123981229?s=40&v=4" width="20" height="20" alt=""> &nbsp; [plastic-labs](https://github.com/plastic-labs) / [honcho](https://github.com/plastic-labs/honcho)                                                                             |    224 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/118967077?s=40&v=4" width="20" height="20" alt=""> &nbsp; [OVINC-CN](https://github.com/OVINC-CN) / [OpenWebUI](https://github.com/OVINC-CN/OpenWebUI)                                                                                   |    202 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/31960995?s=40&v=4" width="20" height="20" alt=""> &nbsp; [zhutoutoutousan](https://github.com/zhutoutoutousan) / [worldquant-miner](https://github.com/zhutoutoutousan/worldquant-miner)                                                 |    202 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/29215115?s=40&v=4" width="20" height="20" alt=""> &nbsp; [iceener](https://github.com/iceener) / [ai](https://github.com/iceener/ai)                                                                                                     |    186 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/187584218?s=40&v=4" width="20" height="20" alt=""> &nbsp; [giselles-ai](https://github.com/giselles-ai) / [giselle](https://github.com/giselles-ai/giselle)                                                                              |    181 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/174666116?s=40&v=4" width="20" height="20" alt=""> &nbsp; [ai-shifu](https://github.com/ai-shifu) / [ai-shifu](https://github.com/ai-shifu/ai-shifu)                                                                                     |    181 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/8931462?s=40&v=4" width="20" height="20" alt=""> &nbsp; [aws-samples](https://github.com/aws-samples) / [sample-serverless-mcp-servers](https://github.com/aws-samples/sample-serverless-mcp-servers)                                    |    175 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/202488052?s=40&v=4" width="20" height="20" alt=""> &nbsp; [celerforge](https://github.com/celerforge) / [freenote](https://github.com/celerforge/freenote)                                                                               |    171 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/104478511?s=40&v=4" width="20" height="20" alt=""> &nbsp; [babelcloud](https://github.com/babelcloud) / [LLM-RGB](https://github.com/babelcloud/LLM-RGB)                                                                                 |    164 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/171735272?s=40&v=4" width="20" height="20" alt=""> &nbsp; [8090-inc](https://github.com/8090-inc) / [xrx-sample-apps](https://github.com/8090-inc/xrx-sample-apps)                                                                       |    163 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/51827949?s=40&v=4" width="20" height="20" alt=""> &nbsp; [deepset-ai](https://github.com/deepset-ai) / [haystack-core-integrations](https://github.com/deepset-ai/haystack-core-integrations)                                            |    163 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/1009716?s=40&v=4" width="20" height="20" alt=""> &nbsp; [codecentric](https://github.com/codecentric) / [c4-genai-suite](https://github.com/codecentric/c4-genai-suite)                                                                  |    152 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/196509932?s=40&v=4" width="20" height="20" alt=""> &nbsp; [XSpoonAi](https://github.com/XSpoonAi) / [spoon-core](https://github.com/XSpoonAi/spoon-core)                                                                                 |    150 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/139558948?s=40&v=4" width="20" height="20" alt=""> &nbsp; [chatchat-space](https://github.com/chatchat-space) / [LangGraph-Chatchat](https://github.com/chatchat-space/LangGraph-Chatchat)                                               |    144 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/134601687?s=40&v=4" width="20" height="20" alt=""> &nbsp; [langfuse](https://github.com/langfuse) / [langfuse-docs](https://github.com/langfuse/langfuse-docs)                                                                           |    139 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/44976328?s=40&v=4" width="20" height="20" alt=""> &nbsp; [piyushgarg-dev](https://github.com/piyushgarg-dev) / [genai-cohort](https://github.com/piyushgarg-dev/genai-cohort)                                                            |    135 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/105285801?s=40&v=4" width="20" height="20" alt=""> &nbsp; [i-dot-ai](https://github.com/i-dot-ai) / [redbox](https://github.com/i-dot-ai/redbox)                                                                                         |    132 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/90423581?s=40&v=4" width="20" height="20" alt=""> &nbsp; [bmd1905](https://github.com/bmd1905) / [ChatOpsLLM](https://github.com/bmd1905/ChatOpsLLM)                                                                                     |    127 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/202074444?s=40&v=4" width="20" height="20" alt=""> &nbsp; [Fintech-Dreamer](https://github.com/Fintech-Dreamer) / [FinSynth](https://github.com/Fintech-Dreamer/FinSynth)                                                                |    121 |
| <img class="avatar mr-2" src="https://avatars.githubusercontent.com/u/1566555?s=40&v=4" width="20" height="20" alt=""> &nbsp; [kenshiro-o](https://github.com/kenshiro-o) / [nagato-ai](https://github.com/kenshiro-o/nagato-ai)                                                                               |    119 |

## 🔒 Security & Privacy

We take data security and privacy seriously. Please refer to our [Security and Privacy](https://langfuse.com/security) page for more information.

### Telemetry

By default, Langfuse automatically reports basic usage statistics of self-hosted instances to a centralized server (PostHog).

This helps us to:

1. Understand how Langfuse is used and improve the most relevant features.
2. Track overall usage for internal and external (e.g. fundraising) reporting.

None of the data is shared with third parties and does not include any sensitive information. We want to be super transparent about this and you can find the exact data we collect [here](/web/src/features/telemetry/index.ts).

You can opt-out by setting `TELEMETRY_ENABLED=false`.

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✨ Core Features

📦 Deploy Langfuse

Langfuse Cloud

Self-Host Langfuse

🔌 Integrations

Main Integrations:

Packages integrated with Langfuse:

🚀 Quickstart

1️⃣ Create new project

2️⃣ Log your first LLM call

3️⃣ See traces in Langfuse

⭐️ Star Us

💭 Support

🤝 Contributing

🥇 License

⭐️ Star History

❤️ Open Source Projects Using Langfuse

🔒 Security & Privacy

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