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Evidently vs Arize Phoenix: catalog facts
Evidently	Arize Phoenix
Free Free and open source under the Apache 2.0 license.	Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.
Command line	Web, Self-hosted
Covers both LLM systems and classic ML models Checks for drift, hallucinations and data leaks	Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes
Requires writing Python code to set up checks Some evaluations depend on access to a judge model	Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product
Downloadable app	Self-hosted, Hosted service
Open source	Closed source
License: Apache-2.0	License: Elastic-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.