| Website | wandb.ai/site/weave |
| Category | AI / LLM Development |
| License | Apache 2.0 (open source) |
| Pricing | Free tier, Teams from $50/user/mo |
Overview
Weave by W&B is a toolkit for building and evaluating LLM applications. Trace calls, evaluate outputs, version prompts. Integrated with the W&B ecosystem.
Pros
- Apache 2.0 license
- Call tracing and logging
- Evaluation framework
- Prompt versioning
- W&B ecosystem integration
- Python-first API
Cons
- W&B dependency
- Teams pricing is high
- Learning curve if new to W&B
- Some features cloud-only
- Heavy for simple projects
Verdict
Weave brings the Weights & Biases approach to LLM development: trace every call, evaluate systematically, version everything. If your team already uses W&B for ML experiments, Weave extends that workflow to LLM applications. The evaluation framework is particularly strong, letting you build test suites for your prompts and track quality over time.