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Braintrust vs Arize Phoenix: catalog facts
Braintrust	Arize Phoenix
Freemium Self-serve sign-up with paid plans listed on the pricing page.	Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.
Web	Web, Self-hosted
Real-time tracing of prompts, responses and tool calls Evals scored by LLMs, code or humans	Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes
Hosted service that requires an account Aimed at teams building LLM products, not individual users	Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product
Hosted service	Self-hosted, Hosted service
Closed source	Closed source
License not stated	License: Elastic-2.0
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 26, 2026

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