Compare software

Arize PhoenixLangSmith
Freemium

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

 Freemium

Can be tried for free, with paid plans listed on its pricing page.

Web, Self-hosted Web
  • Tracing, evals, prompts and experiments in one tool
  • Runs locally, in Docker or on Kubernetes
  • Detailed step-by-step agent tracing
  • SDKs for Python, TypeScript, Go and Java
  • Source-available license rather than an OSI-approved one
  • Some advanced features are in the separate paid Arize AX product
  • Proprietary hosted service
  • Self-hosting requires Kubernetes
Self-hosted, Hosted service Self-hosted, 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 September 26, 2026

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