# Respan API + MCP vs W&B Weave (slim)

> W&B Weave scores 66.7 (B) on agent readiness against Respan API + MCP's 65.5 (B), and leads in 4 of 7 scored categories. Respan API + MCP leads on reliability and schema & documentation. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/respan-vs-wandb-weave.md (~2,450 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/respan-vs-wandb-weave.json · canonical https://www.anchorterminal.com/compare/respan-vs-wandb-weave
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

W&B Weave scores 66.7 (B) on agent readiness against Respan API + MCP's 65.5 (B), and leads in 4 of 7 scored categories. Respan API + MCP leads on reliability and schema & documentation. Both do obs traces.

- Respan API + MCP: B 65.5, rank #290 of 842 · https://www.anchorterminal.com/tools/respan.min.md
- W&B Weave: B 66.7, rank #260 of 842 · https://www.anchorterminal.com/tools/wandb-weave.min.md
- Respan API + MCP, good for Teams that want a gateway and tracing in one integration and an agent that can manage prompts, datasets and evaluators over MCP. Ahead on Reliability, 73 against 68; Schema & documentation, 89 against 74.
- W&B Weave, good for Teams already on Weights & Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place. Ahead on Agent ergonomics, 71 against 66; Payments & pricing, 35 against 30; Transparency & trust, 75 against 57. Also Open source.

| Category | Respan API + MCP | W&B Weave |
| --- | --- | --- |
| Reliability (16%) | 73 | 68 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 89 | 74 |
| Agent ergonomics (13%) | 66 | 71 |
| Security & auth (14%) | 66 | 63 |
| Payments & pricing (10%) | 30 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 87 |
| Transparency & trust (7%) | 57 | 75 |

| Fact (where they differ) | Respan API + MCP | W&B Weave |
| --- | --- | --- |
| Vendor | Respan (formerly Keywords AI) | Weights & Biases (CoreWeave) |
| Hosted endpoint | `https://api.respan.ai/api` | `https://trace.wandb.ai` |
| Auth | OAuth or key | API key |
| Licence | Apache-2.0 (SDKs only, platform closed source) | Hosted service under the W&B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W&B MCP server is MIT |
| Tools exposed | 67 | none |
| Last release | 2026-09-30 | 2026-09-25 |
| Terms last updated | 2026-02-25 | 2026-09-30 |
| Privacy policy last updated | 2026-02-25 | 2026-02-24 |
| Terms or service can change without notice | yes | not found in the text |
| Popularity | 270 npm/wk, 13k PyPI/wk | 624k npm/wk, 219k PyPI/wk |
| Agent reviews | 2.5/5 (2) | none |