Open Source AI Engineering Platform

Trace and evaluate AI Agents. Collaborate with your team to continuously improve quality, cost and latency of your application.追踪并评估 AI 智能体。与团队协作持续优化应用的质量、成本与延迟。Why is Langfuse open source?We believe in the power of open source and community collaboration for several reasons:Transparency Trust: Developers can inspect every line that handles their data, audit security practices, and avoid vendor lock-in.Community Collaboration: The open source community moves quickly and accelerates integrations with LangChain, LiteLLM, OpenTelemetry, and the next library youll build tomorrow. Join our community on GitHub Discussions to shape the roadmap.Faster Innovation: Shared ownership means bugs are squashed and features land sooner.Sovereignty: You can run Langfuse anywhere — from your laptop to an air-gapped cluster — without hitting artificial usage caps. Self-host it on your own infrastructure.Extensible: All data is accessible via the public API which is fully tested. You can wrap/extend Langfuse or build your own workflows and AI platform around it.为什么 Langfuse 选择开源我们坚信开源与社区协作的力量原因如下透明度与信任开发者可以审查处理其数据的每一行代码审计安全实践并避免被单一供应商锁定。社区协作开源社区发展迅速能加速与 LangChain、LiteLLM、OpenTelemetry 以及您未来开发的各类库进行集成。欢迎加入 GitHub Discussions 社区共同规划产品路线图。更快的创新共享共建意味着能更快修复 Bug 并推出新功能。自主掌控您可以在任何环境中运行 Langfuse——从个人笔记本电脑到物理隔离air-gapped的集群——且不受人为设定的使用限额限制。您可以将其自托管在自己的基础设施上。高度可扩展所有数据均可通过经过充分测试的公共 API 访问。您可以对 Langfuse 进行封装或扩展也可以基于它构建自定义工作流及 AI 平台。Launch, observe, improve — repeat.Langfuse helps you ship AI Agents/Products from prototype to production and beyond. Once in production we power your continous improvement loop using production data to make your agents and LLM applications ever more powerful.发布、观测、优化——循环往复。Langfuse 助您将 AI Agent 或 AI 产品从原型阶段推向生产环境及后续阶段。产品上线后我们利用生产数据驱动持续优化闭环让您的 Agent 和大语言模型LLM应用日益强大。All the tools, oneintegrated platform.One integrated platform to trace, manage prompts, evaluate, and experiment from prototype to production scale.所有工具一个集成平台。一个集成平台涵盖从原型设计到生产规模全过程的提示词追踪、管理、评估与实验。OpenTelemetry (OTEL) for LLM ObservabilityOpenTelemetry (OTEL) is a CNCF project that provides a set of specifications, APIs, and libraries that define a standard way to collect distributed traces and metrics from your application.Use this page if your application, framework, or collector already emits OpenTelemetry (OTEL) traces and you want to send them to Langfuse.Langfuse can operate as an OpenTelemetry Backend to receive traces on the/api/public/otel(OTLP) endpoint. In addition to the Langfuse SDKs and native integrations, this OpenTelemetry endpoint is designed to increase compatibility with frameworks, libraries, and languages beyond the SDKs and native integrations. Popular OpenTelemetry libraries include OpenLLMetry and OpenLIT which extend Language support of Langfuse tracing to Java and Go and cover frameworks such as AutoGen, Semantic Kernel, and more.As the Semantic Conventions for GenAI attributes on traces are still evolving, Langfuse maps the received OTel traces to the Langfuse data model and supports additional attributes that are popular in the OTel GenAI ecosystem (attribute mapping). Please contribute to the discussion on GitHub if an integration does not work as expected or does not parse the correct attributes.Using other OTEL-based tools?If youre using Langfuse alongside other OpenTelemetry-based tools, you may run into conflicts. See Using Langfuse with an Existing OpenTelemetry Setup for configuration guidance.Why use Langfuse?Langfuse is the most widely adopted open-source LLM engineering platform. Developers who value open-source and control over their data build production grade agents and LLM applications with Langfuse.The full cycleLangfuse powers the entire development cycle from prototype to full scale production loads.Unified platformAll components of Langfuse work great standalone but excel when used together.Open source (MIT)Inspect the code. Self-host for free. We are the largest OSS community in our category.OTel nativeStandard trace format. Works with existing OpenTelemetry instrumentation.100 integrationsWorks with any model, any framework, and stack.Built for scaleClickHouse backend allows to query millions of traces in milliseconds.Async by defaultTracing never blocks your application. Background processing, automatic batching.Loved by agentsCLI, MCP, accessible docs - coding agents love working with Langfuse.Production-provenBillions of events processed per month. 50M SDK installs/month. Fortune 50 deployments.Shipping velocityThe AI space is changing fast. We understand what patterns matter and ship daily.---Langfuse