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LangfusePydantic Logfire
Freemium

Open source for self-hosting, with a hosted version that can be started for free.

 Freemium

Free for 10 million spans, logs and metrics per month, no card required; paid plans above…

Web, Self-hosted Web
  • Tracing, prompt management and evaluation in one tool
  • Can be self-hosted or used as a hosted service
  • Traces LLM calls alongside API and database activity
  • Built on OpenTelemetry with SQL querying
  • Requires instrumenting your application with its SDK
  • Self-hosting means running and maintaining the server yourself
  • Primarily a hosted service requiring an account
  • Self-hosting is offered as an option rather than the default
Self-hosted, Hosted service Web application, Hosted service
Open source Closed source
License not stated License not stated
Not stated if an account is needed Account needed
Not stated if it works offline Needs internet

Checked September 26, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.