W&B Weave
W&B Weave is a hosted LLM trace + eval desk inside Weights & Biases / CoreWeave Forge: you open Traces (ops, feedback, diffs) and score the same calls.
OUR TAKE
Pick W&B Weave for 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. Pro ingest overage is $0.10/MB (~$100/GB).
Good fit
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.
Poor fit
Free · Pro $60/mo
USD, before tax · Checked 2026-10-27 · wandb.ai/site/pricing
OUR TAKE
Pick W&B Weave for 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. Pro ingest overage is $0.10/MB (~$100/GB). A chatty agent blows past 1.5 GB fast.
Good fit
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.
Poor fit
Free · Pro $60/mo
USD, before tax · Checked 2026-10-27 · wandb.ai/site/pricing
What it costs
USD, before tax · Checked 2026-10-27 · wandb.ai/site/pricing
Free
Up to 5 model seats. 5 GB/mo storage. 1 GB/mo Weave ingestion. Tracing, evals, scorers. Community support
$0
Pro
starts at , . Up to 10 model seats. 100 GB/mo storage (/GB extra). 1.5 GB/mo Weave ingest (/MB extra). Teams, service accounts, CI/CD, Slack/email alerts. Pitched at teams under 50 employees
Lowest paid
$60/mo
Enterprise
Not published by the vendor
Not published by the vendor
Academic
Not published by the vendor
Not published by the vendor
Checked 2026-10-27·wandb.ai/site/pricing
Before you pay
Good fit
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.
Watch out
Pro ingest overage is $0.10/MB (~$100/GB). A chatty agent blows past 1.5 GB fast.
Instead, try
Phoenix if local-first OTel traces when you want Phoenix $0; Langfuse if traces you can self-host when you want Langfuse’s public Cloud $
Compare W&B Weave with
Limits, in full
- 01
Pro ingest overage is $0.10/MB (~$100/GB). A chatty agent blows past 1.5 GB fast.
- 02
Free is 1 GB/mo Weave ingest. A denser month is Pro $60.
- 03
A W&B traces , not Phoenix’s local OTel box. For that see Phoenix.
If W&B Weave isn't it
Why: local-first OTel traces when you want Phoenix $0.
Free· paid from$50/mo
ELv2, not ApacheChecked 2026-10-27·arize.com/pricing
vs W&B Weave
Why: traces you can self-host when you want Langfuse’s public Cloud $.
Free· paid from$2/mo
Hobby is two users and 30-day retentionChecked 2026-10-19·langfuse.com/pricing
vs W&B Weave
Why: an eval + trace workbench when you want Starter $0 / Pro $249.
Free· paid from$249/mo
$0 is the platform feeChecked 2026-10-27·braintrust.dev/pricing
vs W&B WeaveLimits & alternatives3 limits · Phoenix, Langfuse, Braintrust instead
Limits, in full
- 01
Pro ingest overage is $0.10/MB (~$100/GB). A chatty agent blows past 1.5 GB fast.
- 02
Free is 1 GB/mo Weave ingest. A denser month is Pro $60.
- 03
A W&B traces , not Phoenix’s local OTel box. For that see Phoenix.
If W&B Weave isn't it
Why: local-first OTel traces when you want Phoenix $0.
Free· paid from$50/mo
ELv2, not ApacheChecked 2026-10-27·arize.com/pricing
vs W&B WeaveWhy: traces you can self-host when you want Langfuse’s public Cloud $.
Free· paid from$2/mo
Hobby is two users and 30-day retentionChecked 2026-10-19·langfuse.com/pricing
vs W&B WeaveWhy: an eval + trace workbench when you want Starter $0 / Pro $249.
Free· paid from$249/mo
$0 is the platform feeChecked 2026-10-27·braintrust.dev/pricing
vs W&B Weave