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Pydantic Logfire vs Braintrust: catalog facts
Pydantic Logfire	Braintrust
Freemium Free for 10 million spans, logs and metrics per month, no card required; paid plans above…	Freemium Self-serve sign-up with paid plans listed on the pricing page.
Web	Web
Traces LLM calls alongside API and database activity Built on OpenTelemetry with SQL querying	Real-time tracing of prompts, responses and tool calls Evals scored by LLMs, code or humans
Primarily a hosted service requiring an account Self-hosting is offered as an option rather than the default	Hosted service that requires an account Aimed at teams building LLM products, not individual users
Web application, Hosted service	Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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