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Arize PhoenixPromptLayer
Freemium

Phoenix is free to self-host; Arize AX is a separate managed paid platform.

 Freemium

Free plan available with paid tiers for teams.

Web, Self-hosted Web
  • Tracing, evals, prompts and experiments in one tool
  • Runs locally, in Docker or on Kubernetes
  • Visual prompt editing without code redeploys
  • Evaluations with datasets, graders and human review
  • Source-available license rather than an OSI-approved one
  • Some advanced features are in the separate paid Arize AX product
  • Hosted service; prompts and logs live on its servers
  • Requires an account
Self-hosted, Hosted service Web application, Hosted service
Closed source Closed source
License: Elastic-2.0 License not stated
Not stated if an account is needed Account needed
Not stated if it works offline Needs internet

Checked September 26, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.