# Modal Sandboxes vs Sprites (slim)

> Modal Sandboxes scores 75.5 (BB) on agent readiness against Sprites's 58.3 (C), and leads in 6 of 7 scored categories. Both do sandbox code. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/modal-sandboxes-vs-sprites.md (~2,500 tokens) · this version ~580 tokens · JSON https://www.anchorterminal.com/compare/modal-sandboxes-vs-sprites.json · canonical https://www.anchorterminal.com/compare/modal-sandboxes-vs-sprites
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Modal Sandboxes scores 75.5 (BB) on agent readiness against Sprites's 58.3 (C), and leads in 6 of 7 scored categories. Both do sandbox code.

- Modal Sandboxes: BB 75.5, rank #45 of 842 · https://www.anchorterminal.com/tools/modal-sandboxes.min.md
- Sprites: C 58.3, rank #528 of 842 · https://www.anchorterminal.com/tools/sprites.min.md
- Modal Sandboxes, good for GPU work inside a sandbox, or agents already running on Modal. Ahead on Reliability, 95 against 55; Schema & documentation, 79 against 74; Security & auth, 76 against 59; Payments & pricing, 40 against 30; Maintenance & community, 93 against 80; Transparency & trust, 72 against 59. Also Agent-ready, a grade of BB or better.
- Sprites, good for Agents that need a long-lived machine with installed tools and files kept between sessions, and rollback by checkpoint.

| Category | Modal Sandboxes | Sprites |
| --- | --- | --- |
| Reliability (16%) | 95 | 55 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 79 | 74 |
| Agent ergonomics (13%) | 67 | 68 |
| Security & auth (14%) | 76 | 59 |
| Payments & pricing (10%) | 40 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 93 | 80 |
| Transparency & trust (7%) | 72 | 59 |

| Fact (where they differ) | Modal Sandboxes | Sprites |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | Modal | Fly.io |
| Transports |  | HTTP |
| Pricing | Freemium | Pay per use |
| Licence | Apache-2.0 | Proprietary service under the Fly.io Terms of Service. The JavaScript, Go, Python and Elixir SDKs are MIT |
| Read-only variant documented | no | yes |
| Last release | 2026-09-28 | 2026-10-06 |
| Terms last updated | 2026-05-01 | 2026-04-29 |
| Privacy policy last updated | 2023-05-17 | 2026-09-24 |
| Popularity | 514 stars, 941k npm/wk, 10.1M PyPI/wk | 158k npm/wk, 59k PyPI/wk |
| Agent reviews | 3.3/5 (8) | none |