Pick Phoenix if
agent teams who will self-host Phoenix for $0 (uvx arize-phoenix serve) and only open Arize AX when they want a managed cloud.
Read the Phoenix pagePhoenix vs TruLens
Our take
Pick Phoenix if you're on a agent team who will self-host Phoenix for $0 (uvx arize-phoenix serve) and only open Arize AX when they want a managed cloud. Pick TruLens if you're on a rAG team who will run TruLens locally at $0 (you bring compute and judge-model keys) — not Arize first unless they want hosted Signal at $50.
Best for
Phoenix See why an agent failed and prove a fix
TruLens Prove a retrieval fix with public $0
Free plan
Phoenix $0 · local / Docker / Kubernetes. You bring compute. Homepage: uvx arize-phoenix serve
TruLens $0 · local dashboard. You pay your own LLM judge tokens and machines
Lowest paid
Phoenix AX Pro $50/mo
TruLens Not published by the vendor
Coding agent
Phoenix
TruLens Instrumentation
Runs where
Phoenix Hosted
TruLens Hosted
Watch out
Phoenix ELv2, not Apache
TruLens $0 is the library, not judge tokens
Last checked
Phoenix 2026-10-27 · arize.com/pricing
TruLens 2026-10-27 · trulens.org
Which one, then?
Pick TruLens if
rAG teams who will run TruLens locally at $0 (you bring compute and judge-model keys) — not Arize first unless they want hosted Signal at $50.
Read the TruLens page