Langfuse
Free tierOpen-source AI engineering platform to debug, monitor, and improve LLM applications and agents
Key strengths
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Recent changes
- Plans updated: Hobby (free): 50k units/month, 30 days data access, 2 users. Core: $29/month, 100k units/month included, 90 days data access, unlimited users. Pro: $199/month, 100k units/month included, 3 years data access, high rate limits, SOC2 & ISO27001. Enterprise: $2,499/month. Additional usage: $8/100k units.
- Starting price: $0/mo → $29/mo
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Documentation & Integration
Langfuse provides SDKs and integration libraries across a wide range of languages and frameworks:
Native SDKs: Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift
Framework & orchestration integrations: LangChain, LlamaIndex, LiteLLM, Vercel AI SDK, Pydantic AI, Google ADK, CrewAI, OpenAI Agents SDK, AutoGen, Agno Agents, Mastra, DSPy, Spring AI, Microsoft Agent Framework, Temporal, Strands, and more
Model provider integrations: OpenAI, Anthropic, Amazon Bedrock, Azure OpenAI, Google Gemini, Google Vertex AI, Mistral AI, xAI, Groq, vLLM, Ollama, OpenRouter
Tooling & platform integrations: LiteLLM, PostHog, ClickHouse, Promptfoo, Ragas, RAGflow, Dify, Langflow, n8n, OpenWebUI, Claude Code, Cursor, LiveKit, Amazon AgentCore
Instrumentation approach:
- OpenTelemetry (OTel) native — emit traces from any OTel-compatible stack
- Decorator and wrapper patterns available in Python and TypeScript SDKs
- REST API for ingesting events and retrieving traces, scores, prompts, and datasets programmatically
Self-hosting: Fully supported; designed to scale to enterprise workloads (90B+ observations/month)
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