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 →

8.0

GitHub Metrics

Stars

25.0k

Forks

2.5k

Open Issues

608

Watchers

Contributors

149

Weekly Commits

Language

TypeScript

License

NOASSERTION

Last Commit

Apr 16, 2026

Created

May 18, 2023

Latest Release

v3.167.4

Release Date

Apr 10, 2026

Synced: Apr 16, 2026

Quality Scores

Documentation Qualityw: 20%

8.1

Has docs site (https://langfuse.com/docs). Description: 199 chars. Stars signal: 25,011. Contributors: 149. Score: 8.1/10

Community Healthw: 20%

8.3

Stars: 25,011. Contributors: 149. Watchers: 73. Forks: 2,543. Issue ratio: 2.4%. Score: 8.3/10

Maintenance Velocityw: 15%

7.6

Last commit: 0d ago. Weekly commits: 0. Latest release: v3.167.4. Maturity bonus: 2.9y old. Score: 7.6/10

API Design & DXw: 20%

7.6

Stars/issues ratio: 41. Typed language: TypeScript. Has documentation site. License: NOASSERTION. Popularity signal: 25,011 stars. Score: 7.6/10

Production Readinessw: 15%

8.1

Battle-tested: 25,011 stars. Peer review: 149 contributors. Versioned: v3.167.4. Licensed: NOASSERTION. Age: 2.9 years. Maintenance: last commit 0d ago. Score: 8.1/10

Ecosystem Integrationw: 10%

8.1

Fork interest: 2,543. Major ecosystem: TypeScript. License: NOASSERTION. Adoption: 25,011 stars. Has web presence. Score: 8.1/10