# Langfuse

Open-source tracing, evaluation and prompt management for LLM apps in production.

HTML: https://softbests.com/software/langfuse
Markdown: https://softbests.com/software/langfuse.md
Website: https://langfuse.com

- Category: [Agent infrastructure](https://softbests.com/category/agent-tools)
- Pricing: Open source
- Platforms: Self-hosted, Web

## Best for

Teams shipping LLM features who need to see what every model call did, cost and why it failed.

## Why it deserves attention

Langfuse records each LLM request as a trace with nested spans, prompts, outputs, token counts and latency, so you can debug a bad answer or a runaway cost by opening one trace instead of grepping logs. It adds prompt versioning and a playground, datasets and automated evaluations, and dashboards for cost and quality over time. It works with OpenTelemetry and has SDKs for Python, TypeScript and popular frameworks. Self-hosting is one Docker Compose stack with Postgres, ClickHouse and Redis; the cloud plan has a usable free tier. It has roughly 37,000 GitHub stars and an active weekly release cadence. The caveat: self-hosting is a real multi-service deployment, and evaluation features require some setup discipline.

## Can replace

- LangSmith

## Related and alternatives

- [LangChain](https://softbests.com/software/langchain)
- [Ollama](https://softbests.com/software/ollama)