W&B Weave

W&B Weave is ranked #1 of 32 in AI agent observability tools on The Geeks Club. It runs on API, Linux, macOS, Self-hosted, Web, Windows. There is a free plan. A free trial is offered. Paid plans start at $60/mo.

W&B Weave plans and pricing

All plans

Free Free 1 GB/mo Weave data ingestion · 5 GB/mo storage · AI application evaluations, tracing, and scorers site.wandb.ai · 30 Sept 2026

Pro $60/mo billed monthly; annual billing also available Starts at $60/month · 1.5 GB/mo Weave data ingestion · additional ingestion $0.10/MB · fewer than 50 employees site.wandb.ai · 30 Sept 2026

Enterprise Not published Custom plans; invoiced annually upfront Customizable usage · enterprise support · security and compliance features site.wandb.ai · 30 Sept 2026

Compared on AI agent observability tools

Free plan: Yes
Paid from: $60/mo

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W&B Weave

Purpose: W&B Weave provides observability and continuous improvement tools for production AI agents.
Tracing: Weave organizes traces into sessions and turns and represents steps, tools, and sub-agents as first-class concepts.
Monitoring: Built-in and custom signals capture and classify agent interactions, and alerts can be routed through Slack notifications and webhook automations.
Evaluations: Weave provides an evaluation framework with comparisons and visualizations to help identify regressions before deployment.
Playground: Playground lets users compare models and prompting techniques against production traces.
Guardrails: Pre-built safety scorers include toxicity, bias, PII detection, and hallucinations, while quality scores include coherence, fluency, and context relevance.
Integrations: W&B says Weave works with popular LLM frameworks including LangChain and LlamaIndex and supports models from OpenAI, Meta, Amazon Bedrock, and Anthropic.
SDKs and API: Weave provides Python and TypeScript libraries and supports sending OpenTelemetry traces to its OTLP endpoint.
Security: W&B states that its platform is certified to ISO/IEC 27001:2022, ISO/IEC 27017:2015, and ISO/IEC 27018:2019 and is compliant with SOC 2 Type 2 and HIPAA standards.
Encryption: W&B states that data is encrypted in transit using TLS 1.2+ and at rest using AES 256.
Enterprise controls: Enterprise pricing lists options including single sign-on, audit logs, secure private connectivity, and customer-managed encryption keys.
Support: The Pro plan includes priority email and chat support, while Enterprise includes an enterprise support package.
Usage limits: The pricing comparison lists 1 GB per month of Weave data ingestion on Free and 1.5 GB per month on Pro, with additional Pro ingestion priced at $0.10 per MB.
Company: Weights & Biases says it was founded in 2017 by Lukas Biewald, Chris Van Pelt, and Shawn Lewis and was acquired by CoreWeave in May 2025.
Price from: $60/mo

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Where it ranks on The Geeks Club

Best AI Agent Observability Tools in 2026#1 of 32
Best AI Agent Evaluation Tools in 2026#2 of 29
Best LLM Observability Tools in 2026#2 of 26
Best Model Monitoring Software in 2026#2 of 24
Best AI LLM Observability Tools in 2026#1 of 23

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Sources

site.wandb.ai/weave/· checked 30 Sept 2026
site.wandb.ai/partners/· checked 30 Sept 2026
docs.wandb.ai/weave· checked 30 Sept 2026
site.wandb.ai/security/· checked 30 Sept 2026
site.wandb.ai/pricing/· checked 30 Sept 2026
site.wandb.ai/company/about-us/· checked 30 Sept 2026