langfuse/langfuse

Prompt Engineering

🪢 Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more. 🍊YC W23

GitHub →Website →

8.5

GitHub Metrics

Stars

36.0k

Forks

4.0k

Open Issues

1.1k

Watchers

115

Contributors

225

Weekly Commits

382

Language

TypeScript

License

NOASSERTION

Last Commit

Oct 17, 2026

Created

May 18, 2023

Latest Release

v4.63.0

Release Date

Oct 16, 2026

Synced: Oct 17, 2026

Quality Scores

Documentation Qualityw: 20%

8.3

Has docs site (https://langfuse.com/docs). Description: 199 chars. Stars signal: 35,962. Contributors: 225. Score: 8.3/10

Community Healthw: 20%

8.8

Stars: 35,962. Contributors: 225. Watchers: 115. Forks: 4,005. Issue ratio: 3.0%. Score: 8.8/10

Maintenance Velocityw: 15%

9.8

Last commit: 0d ago. Weekly commits: 382. Latest release: v4.63.0. Maturity bonus: 3.4y old. Score: 9.8/10

API Design & DXw: 20%

7.7

Stars/issues ratio: 34. Typed language: TypeScript. Has documentation site. License: NOASSERTION. Popularity signal: 35,962 stars. Score: 7.7/10

Production Readinessw: 15%

8.3

Battle-tested: 35,962 stars. Peer review: 225 contributors. Versioned: v4.63.0. Licensed: NOASSERTION. Age: 3.4 years. Maintenance: last commit 0d ago. Score: 8.3/10

Ecosystem Integrationw: 10%

8.2

Fork interest: 4,005. Major ecosystem: TypeScript. License: NOASSERTION. Adoption: 35,962 stars. Has web presence. Score: 8.2/10