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Weights & Biases vs Arize Phoenix: catalog facts
Weights & Biases	Arize Phoenix
Freemium Offers free use with paid plans for teams.	Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.
Web	Web, Self-hosted
Experiment tracking and comparison in one dashboard Covers both classic ML training and LLM tracing	Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes
Requires an account and sends data to a hosted service Proprietary platform	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
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.