Pick Langfuse if
teams shipping LLM apps who need traces and a cost tile, not another chat UI.
Read the Langfuse pageLangfuse vs Phoenix
Our take
Pick Langfuse if teams shipping LLM apps who need traces and a cost tile, not another chat UI. 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. Skip Langfuse if people who only want a gateway (LiteLLM) or a framework (LangChain) without an observability SKU.
Best for
Langfuse Debug and cost-track generations
Phoenix See why an agent failed and prove a fix
Free plan
Langfuse $0 · for the MIT core. ee/ is not the community license
Phoenix $0 · local / Docker / Kubernetes. You bring compute. Homepage: uvx arize-phoenix serve
Lowest paid
Langfuse Enterprise $2/mo
Phoenix AX Pro $50/mo
Next step up
Langfuse Core $29/mo
Phoenix
Runs where
Langfuse Local or hosted
Phoenix Hosted
Watch out
Langfuse Hobby is two users and 30-day retention
Phoenix ELv2, not Apache
Last checked
Langfuse 2026-10-19 · langfuse.com/pricing
Phoenix 2026-10-22 · 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