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Arize Phoenix vs TruLens: catalog facts
Arize Phoenix	TruLens
Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.	Free Free and open source.
Web, Self-hosted	Windows, macOS, Linux
Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes	OpenTelemetry-native tracing of every agent step Judges explain their scores, not just give numbers
Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product	Aimed at developers comfortable writing code LLM judges add their own model calls and cost
Self-hosted, Hosted service	Downloadable app
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 October 1, 2026

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