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