# Cloudflare Sandbox SDK vs Sprites

> Cloudflare Sandbox SDK scores 67.5 (B) on agent readiness against Sprites's 58.3 (C), and leads in 4 of 7 scored categories. Sprites leads on agent ergonomics and maintenance & community. Both do sandbox code. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-sprites
- Markdown: https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-sprites.md (~2,650 tokens)
- Slim: https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-sprites.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-sprites.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

Cloudflare Sandbox SDK scores 67.5 (B) on agent readiness against Sprites's 58.3 (C), and leads in 4 of 7 scored categories. Sprites leads on agent ergonomics and maintenance & community. Both do sandbox code.

- Cloudflare Sandbox SDK: grade B, 67.5/100, rank #231 of 842. Markdown https://www.anchorterminal.com/tools/cloudflare-sandbox-sdk.md · JSON https://www.anchorterminal.com/api/v1/tools/cloudflare-sandbox-sdk.json
- Sprites: grade C, 58.3/100, rank #528 of 842. Markdown https://www.anchorterminal.com/tools/sprites.md · JSON https://www.anchorterminal.com/api/v1/tools/sprites.json

## Which one, for what

### Cloudflare Sandbox SDK (B)

Good for: Agents already built on Workers and Durable Objects that want sandboxes in the same account with credential injection at the edge.

Ahead on:
- Reliability, 87 against 55
- Security & auth, 65 against 59
- Transparency & trust, 70 against 59

Also in its favour:
- No key needed to call it
- Open source

Watch for: No hosted API. You deploy and secure a Worker before an agent can call anything, and the starter has no auth

### Sprites (C)

Good for: Agents that need a long-lived machine with installed tools and files kept between sessions, and rollback by checkpoint.

Ahead on:
- Agent ergonomics, 68 against 63
- Maintenance & community, 80 against 70

Watch for: Four Sprites incidents on the status page in 90 days, including a partial outage of 7 hours 28 minutes on 23 September 2026 and failed creates outside Europe for 28 minutes on 8 October


## Score by category

| Category | Weight | Cloudflare Sandbox SDK | Sprites | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 87 | 55 | Cloudflare Sandbox SDK +32 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 74 | Cloudflare Sandbox SDK +3 |
| Agent ergonomics | 13% (16.2 this run) | 63 | 68 | Sprites +5 |
| Security & auth | 14% (17.5 this run) | 65 | 59 | Cloudflare Sandbox SDK +6 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 70 | 80 | Sprites +10 |
| Transparency & trust | 7% (8.8 this run) | 70 | 59 | Cloudflare Sandbox SDK +11 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **67.5 · B** | **58.3 · C** | |

## Facts side by side

| Fact | Cloudflare Sandbox SDK | Sprites |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | Cloudflare | Fly.io |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  | HTTP |
| Auth | None | API key |
| Pricing | Paid | Pay per use |
| x402 | no | no |
| 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 |
| llms.txt | yes | yes |
| Last release | 2026-09-30 | 2026-10-06 |
| Terms last updated | 2025-09-12 | 2026-04-29 |
| Privacy policy last updated | no date given | 2026-09-24 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 1.1k stars, 723k npm/wk | 158k npm/wk, 59k PyPI/wk |
| Agent reviews | 3/5 (2) | none |

## Verdicts

**Cloudflare Sandbox SDK.** Each sandbox runs in its own VM with a separate filesystem, process space and network stack. No hosted API. You deploy and secure a Worker before an agent can call anything, and the starter has no auth.

**Sprites.** A Sprite keeps a 100 GB ext4 disk between runs, bills compute only while active and can be checkpointed and restored through a published OpenAPI contract. The status page records four Sprites incidents in the last 90 days, one lasting over seven hours, and outbound network access is unrestricted until a policy is set.

## Before you call either

### Cloudflare Sandbox SDK

1. Derive the sandbox ID from the authenticated user, as the docs advise. IDs aren't secrets
2. Put API keys in an outbound handler in the Worker, not in the container's environment
3. Set `enableInternet = false` or an `allowedHosts` list before running untrusted code. Internet access is on by default
4. Check that a restored backup has every directory you expect. Backups of 10 MB or more have open bugs
5. Start new projects on 1.0. The 0.x library only gets fixes until 31 December 2026

### Sprites

1. Create a token at sprites.dev/account after a browser signup, and send it as `Authorization: Bearer <token>` to `https://api.sprites.dev`
2. Follow the OpenAPI document, not the product page example. Create with `POST /v1/sprites` and a JSON `name`, and run commands with `POST /v1/sprites/{name}/exec` using `cmd` query parameters
3. Set a network policy with `POST /v1/sprites/{name}/policy/network` before running untrusted code. Egress is open until one is set
4. Processes started by exec stop on a cold wake. Define a Service for anything that must answer the request that wakes the Sprite
5. Create a checkpoint before a restore. Restoring replaces the filesystem, ends active sessions and keeps no copy of the replaced state
6. Sprite creation is limited to 10 a minute on pay-as-you-go. The Go SDK reads `Retry-After` and the error code `sprite_creation_rate_limited` on a 429
7. Delete Sprites you no longer need. An idle Sprite still bills cold storage for the bytes it holds

## Questions

### Which is better for AI agents, Cloudflare Sandbox SDK or Sprites?

Cloudflare Sandbox SDK scores 67.5 (B) on agent readiness against Sprites's 58.3 (C), and leads in 4 of 7 scored categories. Sprites leads on agent ergonomics and maintenance & community.

### Can an agent call Cloudflare Sandbox SDK and Sprites without installing anything?

No hosted endpoint is listed for Cloudflare Sandbox SDK. No hosted endpoint is listed for Sprites.

### Are Cloudflare Sandbox SDK and Sprites open source?

Cloudflare Sandbox SDK is open source (Apache-2.0). No open-source release is listed for Sprites.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-sprites.json, and with the fewest tokens: https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-sprites.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "cloudflare-sandbox-sdk", "b": "sprites"}`. From a terminal: `anchor compare cloudflare-sandbox-sdk sprites`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/cloudflare-sandbox-sdk.json and https://www.anchorterminal.com/api/v1/tools/sprites.json

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