W&B Weave review
A broad observability suite for teams tracing, evaluating, and monitoring LLM applications.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
W&B Weave is an observability and evaluation platform for teams building LLM applications and production agents. It records inputs, outputs, metadata, latency, token usage, costs, tool calls, and multi-step agent activity. The platform fits teams that need more than request logs: its feature set covers application and agent tracing, evaluations, prompt experimentation, RAG tracing, production monitoring, guardrails, and cost tracking. It is available through web, API, and self-hosted deployment options.
The plan structure supports a staged adoption path. Free includes AI application evaluations, tracing, scorers, and community support. Pro costs $60 USD per month and adds unlimited teams, team-based access controls, priority email and chat support, CI/CD automations, and Slack and email alerts. Enterprise adds a single-tenant option, a HIPAA-compliant option, secure private connectivity, customer-managed encryption keys, single sign-on, and audit logs. Weave data ingestion, storage, and some usage are billed separately, so the starting subscription is not the full cost picture for higher-volume deployments.
Its strongest differentiator is breadth across development and production workflows. Teams can trace sessions, turns, steps, tools, and sub-agents; compare evaluation results; version prompts; follow retrieval steps; and track model costs. Integrations include OpenAI, Anthropic, Amazon Bedrock, Google, MistralAI, Cohere, LangChain, LlamaIndex, Haystack, DSPy, CrewAI, AutoGen, and MCP. Choose W&B Weave when observability, evaluation, governance, and ecosystem coverage need to sit together. Teams wanting only lightweight request tracing may prefer a narrower tool.
W&B Weave pros and cons
- Where it wins
- Detailed tracing for LLM calls, agents, RAG steps, costs, and latency
- Evaluations, scorers, prompt versioning, and experimentation in one platform
- Web, API, and self-hosted deployment with broad framework integrations
- Where it doesn't
- Weave data ingestion, storage, and some usage are billed separately
- The Free plan has community support rather than priority support
- Its broad feature set may exceed the needs of teams seeking simple tracing
W&B Weave fact sheet, pricing and score →
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