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Arize Phoenix vs Weights & Biases: catalog facts
Arize Phoenix	Weights & Biases
Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.	Freemium Offers free use with paid plans for teams.
Web, Self-hosted	Web
Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes	Experiment tracking and comparison in one dashboard Covers both classic ML training and LLM tracing
Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product	Requires an account and sends data to a hosted service Proprietary platform
Self-hosted, Hosted service	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	Not stated if it works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 26, 2026

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