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Arize Phoenix vs Opik: catalog facts
Arize Phoenix	Opik
Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.	Free The open-source platform is free to self-host.
Web, Self-hosted	Web, Self-hosted
Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes	Tracing, automated evaluations and dashboards together Covers RAG systems and agent workflows
Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product	Self-hosting means running several services yourself Contributors must sign a CLA
Self-hosted, Hosted service	Self-hosted
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.