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Arize Phoenix vs Pydantic Logfire: catalog facts
Arize Phoenix	Pydantic Logfire
Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.	Freemium Free for 10 million spans, logs and metrics per month, no card required; paid plans above…
Web, Self-hosted	Web
Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes	Traces LLM calls alongside API and database activity Built on OpenTelemetry with SQL querying
Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product	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
Closed source	Closed source
License: Elastic-2.0	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 2, 2026

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