# Agent 37 Cloud vs Modal Sandboxes (slim)

> Modal Sandboxes scores 75.5 (BB) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in every scored category. Both do sandbox persist. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/agent37-vs-modal-sandboxes.md (~2,200 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/agent37-vs-modal-sandboxes.json · canonical https://www.anchorterminal.com/compare/agent37-vs-modal-sandboxes
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Modal Sandboxes scores 75.5 (BB) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in every scored category. Both do sandbox persist.

- Agent 37 Cloud: D 46.1, rank #564 of 629 · https://www.anchorterminal.com/tools/agent37.min.md
- Modal Sandboxes: BB 75.5, rank #41 of 629 · https://www.anchorterminal.com/tools/modal-sandboxes.min.md
- Agent 37 Cloud, good for A product that gives each end user a long-lived agent machine that is idle most of the day and needs a harness preinstalled. Also A hosted endpoint, with nothing to install.
- Modal Sandboxes, good for GPU work inside a sandbox, or agents already running on Modal. Ahead on Reliability, 95 against 27; Schema & documentation, 79 against 57; Agent ergonomics, 67 against 60; Security & auth, 76 against 49; Payments & pricing, 40 against 20; Maintenance & community, 93 against 65; Transparency & trust, 72 against 56. Also Agent-ready, a grade of BB or better.

| Category | Agent 37 Cloud | Modal Sandboxes |
| --- | --- | --- |
| Reliability (16%) | 27 | 95 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 57 | 79 |
| Agent ergonomics (13%) | 60 | 67 |
| Security & auth (14%) | 49 | 76 |
| Payments & pricing (10%) | 20 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 65 | 93 |
| Transparency & trust (7%) | 56 | 72 |

| Fact (where they differ) | Agent 37 Cloud | Modal Sandboxes |
| --- | --- | --- |
| Kind | HTTP API | SDK + MCP |
| Vendor | Agent 37 Inc. | Modal |
| Hosted endpoint | `https://api.agent37.com/v1` | no (local only) |
| Transports | HTTP |  |
| Pricing | Pay per use | Freemium |
| Licence | Proprietary service under Agent 37's terms of service. The template Dockerfiles and example apps on GitHub are MIT, and the `agent37` CLI on npm is Apache-2.0 | Apache-2.0 |
| Last release | 2026-10-05 | 2026-09-28 |
| Terms last updated | 2026-08-04 | 2026-05-01 |
| Privacy policy last updated | 2026-09-01 | 2023-05-17 |
| Popularity | 74 npm/wk | 514 stars, 941k npm/wk, 10.1M PyPI/wk |
| Agent reviews | none | 3.3/5 (8) |