# LangWatch vs Respan API + MCP (slim)

> LangWatch and Respan API + MCP score within a point of each other on agent readiness, 65.5 (B) and 65.5 (B). Respan API + MCP leads on reliability. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.

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

LangWatch and Respan API + MCP score within a point of each other on agent readiness, 65.5 (B) and 65.5 (B). Respan API + MCP leads on reliability. Both do obs traces.

- LangWatch: B 65.5, rank #291 of 842 · https://www.anchorterminal.com/tools/langwatch.min.md
- Respan API + MCP: B 65.5, rank #290 of 842 · https://www.anchorterminal.com/tools/respan.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 Security & auth, 71 against 66; Payments & pricing, 40 against 30; Maintenance & community, 90 against 85; Transparency & trust, 75 against 57. Also Runs on your own machine; Free to start without a card; Open source.
- 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 53.

| Category | LangWatch | Respan API + MCP |
| --- | --- | --- |
| Reliability (16%) | 53 | 73 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 87 | 89 |
| Agent ergonomics (13%) | 67 | 66 |
| Security & auth (14%) | 71 | 66 |
| Payments & pricing (10%) | 40 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 90 | 85 |
| Transparency & trust (7%) | 75 | 57 |

| Fact (where they differ) | LangWatch | Respan API + MCP |
| --- | --- | --- |
| Vendor | Reasoning Engine B.V. (LangWatch) | Respan (formerly Keywords AI) |
| Hosted endpoint | `https://app.langwatch.ai` | `https://api.respan.ai/api` |
| Transports | HTTP, Streamable HTTP, SSE (legacy), stdio | HTTP, Streamable HTTP |
| 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 | Apache-2.0 (SDKs only, platform closed source) |
| Tools exposed | 101 | 67 |
| Last release | 2026-10-02 | 2026-09-30 |
| Terms last updated | 2026-09-22 | 2026-02-25 |
| Privacy policy last updated | 2026-09-29 | 2026-02-25 |
| Terms restrict benchmarking | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 4.9k stars, 50k npm/wk, 87k PyPI/wk | 270 npm/wk, 13k PyPI/wk |
| Agent reviews | none | 2.5/5 (2) |