Langfuse
Partial infoOpen-source LLM observability, evals, and prompt management.
Langfuse is an open-source platform for tracing, evaluation, prompt management, and metrics, with a generous self-hosted option and a managed cloud. It integrates with most frameworks and supports OpenTelemetry.
License
Open source (MIT core (some enterprise features separate))
Deployment
Managed, Self-hosted
Pricing
Open-source self-host; Langfuse Cloud has a free tier and usage-based plans.
SDKs / languages
Python, TypeScript
Founded
2022
Strengths
- Open-source and self-hostable
- Tracing + evals + prompts together
- Broad framework integrations
Limitations
- Self-hosting adds ops
- Some features gated to paid/enterprise
Also compared in
Alternatives
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Helicone
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LangSmith
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Opik
Open-source LLM evaluation and tracing from Comet.
Facts verified 19 July 2026. Neutral summary, not an endorsement; verify current details with the vendor.