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MLflow vs Arize Phoenix: catalog facts
MLflow	Arize Phoenix
Free Free and open source.	Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.
Web, Self-hosted, Command line	Web, Self-hosted
Tracing built on OpenTelemetry, independent of LLM provider 50+ built-in evaluation metrics and LLM judges	Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes
Broad feature set takes time to learn Running it for a team means hosting and maintaining a server yourself	Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product
Downloadable app, Self-hosted	Self-hosted, Hosted service
Open source	Closed source
License: Apache-2.0	License: Elastic-2.0
No 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.