Langfuse

Open-source LLM observability: traces, evals, prompt management

langfuse.com · OSS free; cloud free tier

Langfuse traces every LLM call with costs and latencies, manages prompt versions, and runs evals — the ops layer for AI features, self-hostable free.

Capabilities

Capabilities

  • Tracing, token/cost analytics, prompt versioning, evals, datasets; OSS or cloud free tier

Best for

  • Any clone with LLM features you intend to improve after launch

Not for

  • Products with no AI calls to observe