Langfuse is an open-source, MIT-licensed LLM engineering platform covering tracing, evaluation, prompt management, and usage analytics. The core product can be self-hosted without usage limits or license keys, which has made it a common choice for teams that want observability without vendor lock-in. Langfuse Cloud offers a free Hobby tier and paid plans billed on ingested units, with unlimited users from the entry paid plan up. SDKs cover Python and JavaScript with OpenTelemetry support and integrations for common LLM frameworks.
open-sourcellm-tracingevalsprompt-management
Overview
- Founded
- 2022
- Pricing tier
- Low
- Startup-friendly
- Yes
- Enterprise-ready
- Yes
LLM observability
- Request tracing
- Yes
- Quality evals
- Yes
- Prompt management
- Yes
- LLM gateway
- No
- Open-source
- Yes
- Self-hostable
- Yes
- Free tier
- Yes: Hobby plan: 50k units/mo, 2 users; MIT self-host unlimited