W&B Weave
Partial infoLLM tracing and evaluation from Weights & Biases.
Weave is W&B's toolkit for tracing, evaluating, and monitoring LLM applications, integrated with the broader Weights & Biases experiment-tracking platform. It suits teams already using W&B for ML.
License
Proprietary
Deployment
Managed
Pricing
Free personal tier; usage-based team/enterprise plans.
SDKs / languages
Python, TypeScript
Strengths
- Integrates with W&B ecosystem
- Good for ML + LLM teams
- Solid eval tooling
Limitations
- Best value if already on W&B
- Managed only
Alternatives
Arize Phoenix
Open-source LLM tracing and evaluation, OpenTelemetry-native.
Braintrust
Eval-first platform for iterating on LLM quality.
Datadog LLM Observability
LLM tracing and monitoring inside the Datadog platform.
Helicone
Open-source LLM logging and monitoring via a proxy.
Langfuse
Open-source LLM observability, evals, and prompt management.
LangSmith
Tracing, evals, and prompt management from the LangChain team.
Facts verified 19 July 2026. Neutral summary, not an endorsement; verify current details with the vendor.