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Arize Phoenix vs Evidently: catalog facts
Arize Phoenix	Evidently
Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.	Free Free and open source under the Apache 2.0 license.
Web, Self-hosted	Command line
Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes	Covers both LLM systems and classic ML models Checks for drift, hallucinations and data leaks
Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product	Requires writing Python code to set up checks Some evaluations depend on access to a judge model
Self-hosted, Hosted service	Downloadable app
Closed source	Open source
License: Elastic-2.0	License: Apache-2.0
Not stated if an account is 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.