Langfuse
Free tierOpen-source AI engineering platform to debug, monitor, and improve LLM applications and agents
Free tier available·Technical·API available·Open source
Key strengths
Open source (MIT licensed)Self-hostable at scaleLLM observability and tracingPrompt managementLLM-as-a-judge and human evaluation100+ integrations / OTel nativeEnterprise scale (90B+ observations/month)No framework lock-in
Free tier + paid plans · from $29 USD/mo
Founded 2023
Self-hostable
Facts verified against langfuse.com on
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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Langfuse — Technical Overview
Langfuse is an open-source (MIT licensed), self-hostable LLM observability and evaluation platform built for AI/ML engineers developing, monitoring, and improving LLM applications and agents.
Core capabilities:
- Distributed tracing & observability — Capture full execution traces across LLM calls, chains, and agent loops with OpenTelemetry-native instrumentation
- Prompt management — Version, deploy, and A/B test prompts directly from the platform
- Evaluation — Run LLM-as-a-judge scoring and structured human annotation workflows
- 100+ integrations — Native SDKs for Python, TypeScript, Go, Java, .NET, Ruby, PHP, and Swift; framework integrations with LangChain, LlamaIndex, LiteLLM, Vercel AI SDK, Pydantic AI, CrewAI, OpenAI Agents SDK, AutoGen, and more; model provider support for OpenAI, Anthropic, Amazon Bedrock, Azure OpenAI, Google Gemini, Mistral AI, Groq, and others
- No framework lock-in — OTel-native design means traces can be emitted from any stack
- Self-hostable at scale — Proven at 90B+ observations/month; ClickHouse integration for high-volume analytics
API available for programmatic access to traces, scores, prompts, and datasets.
GitHub: 35,400+ stars | Founded: 2022 | HQ: Germany
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