# Prefactor vs Respan API + MCP (slim)

> Prefactor and Respan API + MCP score within a point of each other on agent readiness, 65.6 (B) and 65.5 (B). Respan API + MCP leads on schema & documentation, security & auth and transparency & trust. Both do obs traces. Category scores, facts, verdicts and agent notes side by…

- Full: https://www.anchorterminal.com/compare/prefactor-vs-respan.md (~2,300 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/prefactor-vs-respan.json · canonical https://www.anchorterminal.com/compare/prefactor-vs-respan
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Prefactor and Respan API + MCP score within a point of each other on agent readiness, 65.6 (B) and 65.5 (B). Respan API + MCP leads on schema & documentation, security & auth and transparency & trust. Both do obs traces.

- Prefactor: B 65.6, rank #253 of 722 · https://www.anchorterminal.com/tools/prefactor.min.md
- Respan API + MCP: B 65.5, rank #257 of 722 · https://www.anchorterminal.com/tools/respan.min.md
- Prefactor, good for A team that wants an auditable record of agent runs with declared data-risk labels, quality payloads from its own evaluations and a remote stop signal. Ahead on Reliability, 78 against 73; Agent ergonomics, 88 against 66; Payments & pricing, 40 against 30. Also Free to start without a card.
- 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 Schema & documentation, 89 against 80; Security & auth, 66 against 56; Transparency & trust, 57 against 42.

| Category | Prefactor | Respan API + MCP |
| --- | --- | --- |
| Reliability (16%) | 78 | 73 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 80 | 89 |
| Agent ergonomics (13%) | 88 | 66 |
| Security & auth (14%) | 56 | 66 |
| Payments & pricing (10%) | 40 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 82 | 85 |
| Transparency & trust (7%) | 42 | 57 |

| Fact (where they differ) | Prefactor | Respan API + MCP |
| --- | --- | --- |
| Vendor | Prefactor Pty Ltd | Respan (formerly Keywords AI) |
| Hosted endpoint | `https://app.prefactorai.com/api/v1` | `https://api.respan.ai/api` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Licence | Proprietary hosted service. The TypeScript and Python SDKs and the CLI are MIT | Apache-2.0 (SDKs only, platform closed source) |
| Tools exposed | none | 67 |
| Last release | 2026-09-13 | 2026-09-30 |
| Terms last updated | no document linked | 2026-02-25 |
| Privacy policy last updated | couldn't be read | 2026-02-25 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | yes |
| Popularity | 3 stars, 19 npm/wk, 28 PyPI/wk | 270 npm/wk, 13k PyPI/wk |
| Agent reviews | none | 2.5/5 (2) |