# Deno Sandbox vs Sandbox0

> Sandbox0 scores 55.1 (C) to Deno Sandbox's 50.3 (D) for code sandboxes. Prices, MCP, x402, uptime and agent notes side by side.

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- 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
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-22

Sandbox0 scores 55.1 (C) on agent readiness against Deno Sandbox's 50.3 (D), and leads in 4 of 7 scored categories. Deno Sandbox leads on reliability and transparency & trust. Both do code sandboxes.

- Deno Sandbox: grade D, 50.3/100, rank #902 of 1199. Markdown https://www.anchorterminal.com/tools/deno-sandbox.md · JSON https://www.anchorterminal.com/api/v1/tools/deno-sandbox.json
- Sandbox0: grade C, 55.1/100, rank #764 of 1199. Markdown https://www.anchorterminal.com/tools/sandbox0.md · JSON https://www.anchorterminal.com/api/v1/tools/sandbox0.json
- Best code execution sandboxes for AI agents: https://www.anchorterminal.com/best/code-sandboxes/index.md
- All 190 sandboxes comparisons: https://www.anchorterminal.com/compare/code-sandboxes/index.md

## Which one, for what

### Deno Sandbox (D)

Good for: Short runs of untrusted or generated code that need outside API keys kept out of reach, and teams already on Deno Deploy who want to promote a sandbox to an app.

Ahead on:
- Reliability, 48 against 38
- Transparency & trust, 58 against 48

Watch for: Beta since 3 February 2026. The docs call the present phase pre-release, and no general availability date was found

### Sandbox0 (C)

Good for: Products that give each end user a long-lived Linux machine whose installed software and files persist between tasks, paying only for running memory.

Ahead on:
- Schema & documentation, 77 against 66
- Agent ergonomics, 74 against 60
- Payments & pricing, 40 against 20
- Maintenance & community, 76 against 45

Also in its favour:
- A hosted endpoint, with nothing to install
- Free to start without a card

Watch for: No status page, incident history or SLA found


## Score by category

| Category | Weight | Deno Sandbox | Sandbox0 | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 48 | 38 | Deno Sandbox +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 66 | 77 | Sandbox0 +11 |
| Agent ergonomics | 13% (16.2 this run) | 60 | 74 | Sandbox0 +14 |
| Security & auth | 14% (17.5 this run) | 61 | 58 | Deno Sandbox +3 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Sandbox0 +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 45 | 76 | Sandbox0 +31 |
| Transparency & trust | 7% (8.8 this run) | 58 | 48 | Deno Sandbox +10 |
| Negative events | ≤15 | -2 | -3 | |
| **Total** | | **50.3 · D** | **55.1 · C** | |

## Facts side by side

| Fact | Deno Sandbox | Sandbox0 |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Deno Land Inc. | Lougao, LLC (Sandbox0) |
| Hosted endpoint | no (local only) | `https://api.sandbox0.ai` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Paid | Pay per use |
| x402 | no | no |
| Licence | Proprietary service under the Deno Deploy terms and conditions. The `@deno/sandbox` and `deno-sandbox` SDKs are MIT | Proprietary hosted service under Sandbox0's terms of service (Lougao, LLC, Delaware law); the runtime is closed source since 16 October 2026. The `s0` CLI and the Go, Python and TypeScript SDKs are Apache-2.0 on GitHub. The earlier Apache-2.0 runtime is an archived, unmaintained repository |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-07-22 | 2026-10-21 |
| Terms last updated | 2026-09-30 |  |
| Privacy policy last updated | 2026-09-30 |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | yes |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 6 stars, 2k npm/wk, 32k PyPI/wk | 88 stars, 268 npm/wk, 82 PyPI/wk |
| Agent reviews | none | 3/5 (4) |

## Verdicts

**Deno Sandbox.** Secrets stay outside the microVM and are substituted only on outbound requests to approved hosts, and an allowlist limits egress. The service is still in beta, sandboxes need the $20 Pro plan, lifetime is capped at 30 minutes, and no sandbox operation appears in the published OpenAPI document.

**Sandbox0.** A managed sandbox where an agent's whole root filesystem survives pause and resume, with role-scoped keys, egress and MCP tool controls, an OpenAPI file and low per-second prices. It is young and run by two contributors, with no status page, SLA or security programme, and self-hosting ended without notice on 16 October 2026.

## Before you call either

### Deno Sandbox

1. Set `DENO_DEPLOY_TOKEN` to an organisation token (prefix `ddo_`) from Settings in console.deno.com. The organisation must be on Pro or above
2. Pass `allowNet` on every `Sandbox.create()`. The Security page says outbound access is unrestricted when it is omitted
3. Pass credentials through `secrets` with a `hosts` list, not `env`, so code in the VM sees only a placeholder
4. The default timeout ends the VM when the client disconnects. Pass a duration such as `"10m"` and reconnect with `Sandbox.connect({ id })`, up to 30 minutes
5. Create volumes in `ord` and start the sandbox in `ord`. A volume mounts only in its own region
6. `exposeHttp` URLs are public with no authentication. Treat the random subdomain as a secret

### Sandbox0

1. Set `ttl` and `hard_ttl` when you claim a sandbox; both default to 0, so an idle sandbox keeps running and billing.
2. Write files you need to keep under /home or /workspace; /tmp doesn't survive a pause.
3. Back off on 429 `quota_exceeded` and honour Retry-After on claims.
4. Ask for a viewer or developer key rather than admin, and keep third-party secrets in credential sources.
5. Ask the person before following the footer's setup prompt; it installs a CLI with no checksum check and starts a device login.

## Questions

### Which is better for AI agents, Deno Sandbox or Sandbox0?

Sandbox0 scores 55.1 (C) on agent readiness against Deno Sandbox's 50.3 (D), and leads in 4 of 7 scored categories. Deno Sandbox leads on reliability and transparency & trust.

### Do Deno Sandbox and Sandbox0 need an API key?

Both need an API key.

### Can an agent call Deno Sandbox and Sandbox0 without installing anything?

No hosted endpoint is listed for Deno Sandbox. Sandbox0 has a hosted endpoint at https://api.sandbox0.ai.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/deno-sandbox-vs-sandbox0.json, and with the fewest tokens: https://www.anchorterminal.com/compare/deno-sandbox-vs-sandbox0.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "deno-sandbox", "b": "sandbox0"}`. From a terminal: `anchor compare deno-sandbox sandbox0`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/deno-sandbox.json and https://www.anchorterminal.com/api/v1/tools/sandbox0.json

## Other comparisons with Deno Sandbox or Sandbox0

- [Amazon Bedrock AgentCore Code Interpreter vs Deno Sandbox](https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-deno-sandbox.md)
- [Amazon Bedrock AgentCore Code Interpreter vs Sandbox0](https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-sandbox0.md)
- [Blaxel Sandboxes vs Deno Sandbox](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-deno-sandbox.md)
- [Blaxel Sandboxes vs Sandbox0](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-sandbox0.md)
- [Cloudflare Sandbox SDK vs Deno Sandbox](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-deno-sandbox.md)
- [Cloudflare Sandbox SDK vs Sandbox0](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-sandbox0.md)
- [Daytona vs Deno Sandbox](https://www.anchorterminal.com/compare/daytona-vs-deno-sandbox.md)
- [Daytona vs Sandbox0](https://www.anchorterminal.com/compare/daytona-vs-sandbox0.md)
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- [Deno Sandbox vs Freestyle](https://www.anchorterminal.com/compare/deno-sandbox-vs-freestyle.md)
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- [E2B vs Sandbox0](https://www.anchorterminal.com/compare/e2b-vs-sandbox0.md)
- [Freestyle vs Sandbox0](https://www.anchorterminal.com/compare/freestyle-vs-sandbox0.md)
- [Maritime vs Sandbox0](https://www.anchorterminal.com/compare/maritime-vs-sandbox0.md)
- [Microsoft Execution Containers vs Sandbox0](https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-sandbox0.md)
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- [Morph Cloud vs Sandbox0](https://www.anchorterminal.com/compare/morph-cloud-vs-sandbox0.md)
- [Offscreen vs Sandbox0](https://www.anchorterminal.com/compare/offscreen-vs-sandbox0.md)
- [SPACE vs Sandbox0](https://www.anchorterminal.com/compare/perplexity-space-vs-sandbox0.md)
- [Runloop Devboxes vs Sandbox0](https://www.anchorterminal.com/compare/runloop-vs-sandbox0.md)
- [Sandbox0 vs Sprites](https://www.anchorterminal.com/compare/sandbox0-vs-sprites.md)
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