W&B Weave review

W&B Weave is the natural pick for machine learning teams that already use Weights & Biases for training runs, since tracing, evaluation and model experiments share one workspace. The pricing page, now branded CoreWeave Forge, lists tracing that captures inputs, outputs and metadata for each inference, side-by-side comparison of recipes for accuracy, latency and token usage, LLM-as-a-judge metrics, production monitoring and PII redaction. The free plan includes AI application tracing, evaluations and scorers with 1 GB of Weave ingestion a month. Pro starts at $60 a month billed monthly with a 30-day trial and adds team access controls, CI/CD automations and Slack and email alerts, with 1.5 GB of ingestion. It ranks last because ingestion allowances are small for production tracing, extra data is billed per MB, and Pro is limited to companies with fewer than 50 employees.

Who it is for

ML teams already tracking experiments in Weights & Biases

Price

Free plan; Pro starts at $60 a month billed monthly with a 30-day free trial.

Starts at $60/month, billed monthly
Quoted from the vendor pricing page on November 12, 2026.

Key features

• Tracing that captures inputs, outputs and metadata for each inference
• Side-by-side comparison of fine-tuning, RAG, LLM and dataset recipes for accuracy, latency and token usage
• LLM-as-a-judge metrics and production monitoring
• PII data redaction
• CI/CD automations and Slack and email alerts on Pro

Strengths and weaknesses

• Strength: Free plan includes AI application tracing, evaluations and scorers
• Strength: Same account covers model experiment tracking and a registry
• Strength: Pro has a 30-day free trial
• Weakness: Free plan includes only 1 GB a month of Weave data ingestion
• Weakness: Extra Weave ingestion is billed per MB
• Weakness: Pro is meant for teams under 50 employees; larger companies must move to Enterprise

Key facts

• Free plan: Yes, 1 GB a month of Weave ingestion
• Pro: From $60 a month billed monthly, 1.5 GB of Weave ingestion
• Free trial: 30 days on Pro
• Pro eligibility: Teams under 50 employees

Where it ranks

W&B Weave is No. 9 in our Best LLM Observability Tools verdict.