W&B Weave
LLM tracing and evaluation toolkit from Weights & Biases, integrated with the broader W&B experiment-tracking ecosystem.
| Category | Observability & Tracing |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | freemium |
| Pricing notes | Free tier on W&B cloud; usage-based ingestion pricing; enterprise self-hosting via W&B Server |
| Framework integrations | openai-sdk, anthropic, langchain, llamaindex, mistral |
| Funding / ownership | Weights & Biases acquired by CoreWeave (~$1.7B, 2025) |
Pricing/feature source: https://wandb.ai/site/pricing/