Tools · Observability

Weights and Biases Weave

LLM tracing and eval inside W&B.

Proprietary freemium

Observability Evaluation Data scientist Platform engineer

In these stacks

Build my own agent See what my agents do Test and score my agents

LicenseProprietary

PriceFree tier

UsageNo model cost

Model supportmulti

Languagespython, typescript

GitHub stars—

Last activity—

VerifiedThu Jun 25 2026 00:00:00 GMT+0000 (Coordinated Universal Time)

Verified byseed

The LLM-focused tracing and evaluation layer of Weights and Biases, tying into its experiment-tracking ecosystem.

Strengths

Integrates with existing W&B experiment tracking
Good for ML teams already on W&B

Tradeoffs

Most useful only if you already use W&B
Proprietary

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