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

34.1k

Forks

3.7k

Open Issues

875

Watchers

111

Contributors

203

Weekly Commits

Language

TypeScript

License

NOASSERTION

Last Commit

Sep 2, 2026

Created

May 18, 2023

Latest Release

v4.27.0

Release Date

Sep 1, 2026

Synced: Sep 2, 2026

Quality Scores

Documentation Qualityw: 20%

8.3

Has docs site (https://langfuse.com/docs). Description: 199 chars. Stars signal: 34,071. Contributors: 203. Score: 8.3/10

Community Healthw: 20%

8.7

Stars: 34,071. Contributors: 203. Watchers: 111. Forks: 3,678. Issue ratio: 2.6%. Score: 8.7/10

Maintenance Velocityw: 15%

9.8

Last commit: 0d ago. Weekly commits: 68. Latest release: v4.27.0. Maturity bonus: 3.3y old. Score: 9.8/10

API Design & DXw: 20%

7.6

Stars/issues ratio: 39. Typed language: TypeScript. Has documentation site. License: NOASSERTION. Popularity signal: 34,071 stars. Score: 7.6/10

Production Readinessw: 15%

8.3

Battle-tested: 34,071 stars. Peer review: 203 contributors. Versioned: v4.27.0. Licensed: NOASSERTION. Age: 3.3 years. Maintenance: last commit 0d ago. Score: 8.3/10

Ecosystem Integrationw: 10%

8.2

Fork interest: 3,678. Major ecosystem: TypeScript. License: NOASSERTION. Adoption: 34,071 stars. Has web presence. Score: 8.2/10