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Langfuse

★ 13k

LLM observability: traces, evals, prompt management and cost tracking for your AI features. Drop-in SDKs.

Langfuse does the job of LangSmith, self-hosted. It is MIT-licensed, so you can do essentially what you like with it, and it installs in about one command. LangSmith bills $59/mo for it. 13k stars on GitHub.

Open-source replacement for LangSmith.

Licence
MIT
Self-hosting
Easy
The paid one costs
$59/mo
GitHub stars
13k
view the code →official site →

Is it actually a replacement?

We have not written a verdict on LangSmith yet, so this page says what Langfuse is rather than judging what you would give up. When that product gets a page, this one will link to it.

Langfuse questions

Is Langfuse open source?

Yes — it is released under MIT.

Can I self-host Langfuse?

Yes — we rate it easy to self-host.

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