# Microsoft Execution Containers vs Sprites (slim)

> Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Sprites's 58.3 (C), and leads in every scored category. Both do sandbox code. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-sprites.md (~2,800 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-sprites.json · canonical https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-sprites
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Sprites's 58.3 (C), and leads in every scored category. Both do sandbox code.

- Microsoft Execution Containers: BB 76.3, rank #35 of 842 · https://www.anchorterminal.com/tools/microsoft-execution-containers.min.md
- Sprites: C 58.3, rank #528 of 842 · https://www.anchorterminal.com/tools/sprites.min.md
- Microsoft Execution Containers, good for A developer building an agent or tool host that must run model-written code on the user's own machine, above all on Windows, where it reaches Microsoft's process and session isolation. Ahead on Reliability, 81 against 55; Schema & documentation, 81 against 74; Agent ergonomics, 74 against 68; Security & auth, 69 against 59; Payments & pricing, 60 against 30; Maintenance & community, 92 against 80; Transparency & trust, 83 against 59. Also Agent-ready, a grade of BB or better; No key needed to call it; Free to start without a card; Open source.
- Sprites, good for Agents that need a long-lived machine with installed tools and files kept between sessions, and rollback by checkpoint.

| Category | Microsoft Execution Containers | Sprites |
| --- | --- | --- |
| Reliability (16%) | 81 | 55 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 81 | 74 |
| Agent ergonomics (13%) | 74 | 68 |
| Security & auth (14%) | 69 | 59 |
| Payments & pricing (10%) | 60 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 92 | 80 |
| Transparency & trust (7%) | 83 | 59 |

| Fact (where they differ) | Microsoft Execution Containers | Sprites |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | Microsoft | Fly.io |
| Transports |  | HTTP |
| Auth | None | API key |
| Pricing | Free | Pay per use |
| Licence | MIT | Proprietary service under the Fly.io Terms of Service. The JavaScript, Go, Python and Elixir SDKs are MIT |
| llms.txt | no | yes |
| Terms last updated | no document linked | 2026-04-29 |
| Privacy policy last updated | couldn't be read | 2026-09-24 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | 1.5k stars, 472k npm/wk | 158k npm/wk, 59k PyPI/wk |