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Langfuse vs Arize Phoenix: catalog facts
Langfuse	Arize Phoenix
Freemium Open source for self-hosting, with a hosted version that can be started for free.	Freemium Phoenix is free to self-host; Arize AX is a separate managed paid platform.
Web, Self-hosted	Web, Self-hosted
Tracing, prompt management and evaluation in one tool Can be self-hosted or used as a hosted service	Tracing, evals, prompts and experiments in one tool Runs locally, in Docker or on Kubernetes
Requires instrumenting your application with its SDK Self-hosting means running and maintaining the server yourself	Source-available license rather than an OSI-approved one Some advanced features are in the separate paid Arize AX product
Self-hosted, Hosted service	Self-hosted, Hosted service
Open source	Closed source
License not stated	License: Elastic-2.0
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 September 26, 2026

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