Compare software

Arize Phoenix vs MLflow: catalog facts
Arize Phoenix	MLflow
Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.	Free Free and open source.
Web, Self-hosted	Web, Self-hosted, Command line
Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes	Tracing built on OpenTelemetry, independent of LLM provider 50+ built-in evaluation metrics and LLM judges
Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product	Broad feature set takes time to learn Running it for a team means hosting and maintaining a server yourself
Self-hosted, Hosted service	Downloadable app, Self-hosted
Closed source	Open source
License: Elastic-2.0	License: Apache-2.0
Not stated if an account is needed	No account 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.