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Arize Phoenix vs DeepEval: catalog facts
Arize Phoenix	DeepEval
Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.	Free The framework is free and open source.
Web, Self-hosted	Command line
Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes	Treats LLM output checks like unit tests Very active development with a large user base
Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product	Aimed at developers comfortable with Python code Evaluations that rely on a judge model may need API access to one
Self-hosted, Hosted service	Downloadable app
Closed source	Open source
License: Elastic-2.0	License not stated
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.