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Pydantic LogfireLangSmith
Freemium

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

 Freemium

Can be tried for free, with paid plans listed on its pricing page.

Web Web
  • Traces LLM calls alongside API and database activity
  • Built on OpenTelemetry with SQL querying
  • Detailed step-by-step agent tracing
  • SDKs for Python, TypeScript, Go and Java
  • Primarily a hosted service requiring an account
  • Self-hosting is offered as an option rather than the default
  • Proprietary hosted service
  • Self-hosting requires Kubernetes
Web application, Hosted service Self-hosted, Hosted service
Closed source Closed source
License not stated License not stated
Account needed Account needed
Needs internet Needs internet

Checked October 2, 2026

Checked September 26, 2026

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