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DeepEval vs Arize Phoenix: catalog facts
DeepEval	Arize Phoenix
Free The framework is free and open source.	Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.
Command line	Web, Self-hosted
Treats LLM output checks like unit tests Very active development with a large user base	Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes
Aimed at developers comfortable with Python code Evaluations that rely on a judge model may need API access to one	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 not stated	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.