# LangWatch vs W&B Weave (slim)

> W&B Weave scores 66.7 (B) on agent readiness against LangWatch's 65.5 (B), and leads in 2 of 7 scored categories. LangWatch leads on schema & documentation, security & auth and payments & pricing. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave.md (~2,600 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave.json · canonical https://www.anchorterminal.com/compare/langwatch-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 LangWatch's 65.5 (B), and leads in 2 of 7 scored categories. LangWatch leads on schema & documentation, security & auth and payments & pricing. Both do obs traces.

- LangWatch: B 65.5, rank #291 of 842 · https://www.anchorterminal.com/tools/langwatch.min.md
- W&B Weave: B 66.7, rank #260 of 842 · https://www.anchorterminal.com/tools/wandb-weave.min.md
- LangWatch, good for Teams that want tracing, evaluations and simulated-user agent tests in one open-source product, hosted in the EU or self-hosted, and that drive it from a coding assistant through MCP or the CLI. Ahead on Schema & documentation, 87 against 74; Security & auth, 71 against 63; Payments & pricing, 40 against 35. Also Runs on your own machine; Free to start without a card.
- 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 Reliability, 68 against 53.

| Category | LangWatch | W&B Weave |
| --- | --- | --- |
| Reliability (16%) | 53 | 68 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 87 | 74 |
| Agent ergonomics (13%) | 67 | 71 |
| Security & auth (14%) | 71 | 63 |
| Payments & pricing (10%) | 40 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 90 | 87 |
| Transparency & trust (7%) | 75 | 75 |

| Fact (where they differ) | LangWatch | W&B Weave |
| --- | --- | --- |
| Vendor | Reasoning Engine B.V. (LangWatch) | Weights & Biases (CoreWeave) |
| Hosted endpoint | `https://app.langwatch.ai` | `https://trace.wandb.ai` |
| Transports | HTTP, Streamable HTTP, SSE (legacy), stdio | HTTP, Streamable HTTP |
| Auth | OAuth or key | API key |
| Licence | Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT | 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 | 101 | none |
| Last release | 2026-10-02 | 2026-09-25 |
| Terms last updated | 2026-09-22 | 2026-09-30 |
| Privacy policy last updated | 2026-09-29 | 2026-02-24 |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 4.9k stars, 50k npm/wk, 87k PyPI/wk | 624k npm/wk, 219k PyPI/wk |