W&B Weave
W&B Weave: A broad observability suite for teams tracing, evaluating, and monitoring LLM applications. Ranked #5 of 26 in LLM Observability Tools by our editors (9.0/10); pricing: Free plan · 30-day trial; best for growing teams wanting mature, broad observability.
At a glance
- Editor score9.0 / 10
- PricingFree plan · 30-day trial
- Best forGrowing teams wanting mature, broad observability
- Free planYes
- Paid from$60/mo
- LLM tracingYes
- Founded2017 · San Francisco, California, United States
- Facts checked20 Sep 2026
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
Our verdict on W&B Weave
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.
Your product? Our editors can test W&B Weave in depth and publish a review, labelled as paid · from $149/mo →
W&B Weave pricing
All 3 W&B Weave plans and prices →
W&B Weave fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $60/mo |
| LLM tracing | Yes |
| LLM evaluations | Yes |
| Prompt management | Yes |
| Agent tracing | Yes |
| Retrieval tracing | Yes |
| Token cost tracking | Yes |
| Deployment options | Both |
| Free trial | 30 days |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Compliance & security | SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML |
| Support | Email, Live chat, Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 30+ integrations: OpenAI, Anthropic, Amazon Bedrock, Google, MistralAI, Cohere … See all → |
| Pricing | Free plan · 30-day trial (source) |
| Website | site.wandb.ai |
| Facts checked | 20 Sep 2026 |
W&B Weave integrations
W&B Weave lists 30+ integrations on its own site — the 15 named here are the ones its pages call out.
- OpenAI
- Anthropic
- Amazon Bedrock
- MistralAI
- Cohere
- OpenAI Agents SDK
- Claude Agent SDK
- LangChain
- LlamaIndex
- Haystack
- DSPy
- CrewAI
- AutoGen
- MCP
See all W&B Weave integrations →
Alternatives to W&B Weave
- Arize AXBroad LLM observability with tracing, evaluations, prompts, agents, RAG, and cost tracking.9.4
- LangfuseA broad observability platform with open-source deployment and accessible paid tiers.9.3
- Arize PhoenixA free platform for tracing, evaluating, and improving LLM applications.9.2
See all W&B Weave alternatives →
W&B Weave vs the competition
- W&B Weave vs Arize AX
- W&B Weave vs Langfuse
- W&B Weave vs Arize Phoenix
- W&B Weave vs Opik
- W&B Weave vs LangSmith
- W&B Weave vs LangWatch
Compare W&B Weave with any tool side by side →
Also Ranked In
W&B Weave is ranked in 7 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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