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 →

8.1

GitHub Metrics

Stars

30.0k

Forks

3.1k

Open Issues

676

Watchers

100

Contributors

177

Weekly Commits

Language

TypeScript

License

NOASSERTION

Last Commit

Jun 27, 2026

Created

May 18, 2023

Latest Release

v3.201.1

Release Date

Jun 26, 2026

Synced: Jun 29, 2026

Quality Scores

Documentation Qualityw: 20%

8.2

Has docs site (https://langfuse.com/docs). Description: 199 chars. Stars signal: 29,960. Contributors: 177. Score: 8.2/10

Community Healthw: 20%

8.6

Stars: 29,960. Contributors: 177. Watchers: 100. Forks: 3,126. Issue ratio: 2.3%. Score: 8.6/10

Maintenance Velocityw: 15%

7.7

Last commit: 2d ago. Weekly commits: 0. Latest release: v3.201.1. Maturity bonus: 3.1y old. Score: 7.7/10

API Design & DXw: 20%

7.6

Stars/issues ratio: 44. Typed language: TypeScript. Has documentation site. License: NOASSERTION. Popularity signal: 29,960 stars. Score: 7.6/10

Production Readinessw: 15%

8.2

Battle-tested: 29,960 stars. Peer review: 177 contributors. Versioned: v3.201.1. Licensed: NOASSERTION. Age: 3.1 years. Maintenance: last commit 2d ago. Score: 8.2/10

Ecosystem Integrationw: 10%

8.1

Fork interest: 3,126. Major ecosystem: TypeScript. License: NOASSERTION. Adoption: 29,960 stars. Has web presence. Score: 8.1/10