Compare software

Pydantic LogfireLangfuse
Freemium

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

 Freemium

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

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

Checked October 2, 2026

Checked September 26, 2026

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