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OPS · Observability & ops

Langfuse

Open-source observability for LLM apps: trace every call, run evals, and watch cost and quality over time.

view source ↗★ 29k stars

license

MIT

language

TypeScript

status

bookmarked

added

2026-06-17

categories

OPS · Observability & ops

tags

productobservabilityevalstracing

what we've heard

1 note from the team

liked

Dennis · in production at company X

Open-source and free; does what we need, and we picked it over a similar paid tool.