L
Langfuse
Open-source LLM engineering platform — traces, evals, prompt management — 23K+ stars
Open Sourcefreemium
About
Langfuse is an open-source LLM engineering platform providing observability, analytics, and prompt management. Features distributed tracing for complex agent chains, evaluation scoring, prompt versioning and A/B testing, dataset management, and cost tracking. Integrates with LangChain, LlamaIndex, OpenAI SDK, and any LLM framework via OpenTelemetry.
Details
| Type | observability, evaluation, prompt-management |
| Integrations | langchain, llamaindex, openai, anthropic, opentelemetry |
| Language | typescript, python |
Tags
observabilitytracingevaluationprompt-managementanalyticsopen-source
Quick Info
- Organization
- Langfuse
- Pricing
- freemium
- Free Tier
- Yes
- Updated
- Apr 1, 2026
24.1Ktoday141
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