Pick Langtrace if
teams who will stay on Starter at $0 (10k spans, 1 user) or self-host, then Growth at $39/user/month when they need cloud evals and collaboration.
Read the Langtrace pageLangtrace vs Phoenix
Our take
Pick Langtrace if you're on a team who will stay on Starter at $0 (10k spans, 1 user) or self-host, then Growth at $39/user/month when they need cloud evals and collaboration. 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.
Best for
Langtrace See the chain as OTel spans at a public $
Phoenix See why an agent failed and prove a fix
Free plan
Langtrace $0 · forever. 1 user. Up to 10k spans / month. Prompt management and evaluations
Phoenix $0 · local / Docker / Kubernetes. You bring compute. Homepage: uvx arize-phoenix serve
Lowest paid
Langtrace Growth $39/user/mo
Phoenix AX Pro $50/mo
Runs where
Langtrace
Phoenix Hosted
Watch out
Langtrace Starter is 1 user and 10k spans
Phoenix ELv2, not Apache
Last checked
Langtrace 2026-10-27 · docs.langtrace.ai/introduction
Phoenix 2026-10-27 · arize.com/pricing
Which one, then?
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 page