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 W&B Weave
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 W&B Weave if you're on a teams already on W&B who will stay on Free at $0 (5 model seats, 5 GB storage, 1 GB Weave ingest) while they open a first Traces table, then Pro at $60/month when they need team and 1.5 GB ingest.
Best for
Phoenix See why an agent failed and prove a fix
W&B Weave LLM traces under the same W&B account at a public $
Free plan
Phoenix $0 · local / Docker / Kubernetes. You bring compute. Homepage: uvx arize-phoenix serve
W&B Weave $0 · /month. Up to 5 model seats. 5 GB/mo storage. 1 GB/mo Weave ingestion. Tracing, evals, scorers. Community support
Lowest paid
Phoenix AX Pro $50/mo
W&B Weave Pro $60/mo, monthly only
Runs where
Phoenix Hosted
W&B Weave Hosted
Watch out
Phoenix ELv2, not Apache
W&B Weave Pro ingest overage is $0.10/MB (~$100/GB)
Last checked
Phoenix 2026-10-27 · arize.com/pricing
W&B Weave 2026-10-27 · wandb.ai/site/pricing
Which one, then?
Pick W&B Weave if
teams already on W&B who will stay on Free at $0 (5 model seats, 5 GB storage, 1 GB Weave ingest) while they open a first Traces table, then Pro at $60/month when they need teams and 1.5 GB ingest.
Read the W&B Weave page