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BraintrustPydantic Logfire
Freemium

Self-serve sign-up with paid plans listed on the pricing page.

 Freemium

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

Web Web
  • Real-time tracing of prompts, responses and tool calls
  • Evals scored by LLMs, code or humans
  • Traces LLM calls alongside API and database activity
  • Built on OpenTelemetry with SQL querying
  • Hosted service that requires an account
  • Aimed at teams building LLM products, not individual users
  • Primarily a hosted service requiring an account
  • Self-hosting is offered as an option rather than the default
Hosted service Web application, Hosted service
Closed source Closed source
License not stated License not stated
Account needed Account needed
Needs internet Needs internet

Checked October 1, 2026

Checked October 2, 2026

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