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Code & Dev Tools · verified 2026-07-25

Langfuse

Tracing and evals for LLM apps.

Open-source observability: trace every prompt and tool call, score outputs, manage prompt versions and watch cost per feature.

Rating: 4.5 / 5
Pricing: Open source
Best for: Evals, Observability, Developers
Platforms: Web, API, Linux
Runs locally: Yes
Content policy: Standard filters

Matching filters

Writing code Building apps Research Evals & observability Tool & function calling Versioning & history Has a public API Open source Free or open source Web Linux Desktop app API Runs locally

What stands out

Self-hostable with Docker
Prompt versioning
Cost and latency dashboards

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