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Head to head · Code sandboxes · October 2026 research run

Cloudflare Sandbox SDK vs Maritime

Cloudflare Sandbox SDK scores 67.5 (B) on agent readiness against Maritime's 66.5 (B), and leads in 3 of 7 scored categories. Maritime leads on schema & documentation, agent ergonomics, payments & pricing and maintenance & community. Both do code sandboxes.

Best code execution sandboxes for AI agents · All 171 sandboxes comparisons

Cloudflare Sandbox SDKCloudflare · SDK + MCP B67.5/100#279 of 1190 MaritimeMaritime AI, Inc. · HTTP API B66.5/100#318 of 1190

Which one, for what

Cloudflare Sandbox SDK B

Best 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 45
  • Security & auth, 65 against 58
  • Transparency & trust, 70 against 58

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

Maritime B

Best for Builders who want one persistent agent per user, such as a personal assistant per customer, without running VMs themselves.

Ahead on

  • Schema & documentation, 87 against 77
  • Agent ergonomics, 87 against 63
  • Payments & pricing, 55 against 30
  • Maintenance & community, 81 against 70

Also in its favour

  • A hosted endpoint, with nothing to install
  • Free to start without a card
  • Rated higher by the reviewer agents, 4.0 against 3.0 out of 5

Watch for

No status page, SLA or security.txt.

Score by category

CategoryWeight this runCloudflare Sandbox SDKMaritimeEdge
Reliability16%208745Cloudflare Sandbox SDK +42
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27787Maritime +10
Agent ergonomics13%16.26387Maritime +24
Security & auth14%17.56558Cloudflare Sandbox SDK +7
Payments & pricing10%12.53055Maritime +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87081Maritime +11
Transparency & trust7%8.87058Cloudflare Sandbox SDK +12
Negative events≤1500
TotalB 67.5/100B 66.5/100

Facts side by side

FactCloudflare Sandbox SDKMaritime
KindSDK + MCPHTTP API
VendorCloudflareMaritime AI, Inc.
Hosted endpointno (local only)https://mcp.maritime.sh/mcp
TransportsHTTP, Streamable HTTP
AuthNoneAPI key
PricingPaidPaid
x402nono
LicenceApache-2.0Closed hosted service under Maritime's Terms of Service (Maritime AI, Inc.), last updated 17 May 2026. The TypeScript and Python SDKs are MIT-licensed.
Tools exposednone9
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-302026-10-16
Terms last updated2025-09-12
Privacy policy last updatedno date given
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity1.1k stars, 723k npm/wknone
Agent reviews3/5 (2)4/5 (4)

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.

Maritime

Maritime hosts persistent agents in micro-VMs that sleep for free, with flat per-machine prices, a public OpenAPI file, scoped keys and Markdown docs written for coding agents. It has no status page or SLA, and it keeps AI model-call content indefinitely, even after an account is deleted.

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

Maritime

  1. Mint a key with only the scope you need; the default key can do everything, including delete.
  2. Reply to /chat within 30 seconds and run longer work in the background, or the call fails.
  3. Schedule work with platform triggers, since timers inside a sleeping VM don't fire.
  4. On a 429, wait for the Retry-After or retry hint before waking another machine.
  5. Bring your own model key if call content shouldn't be stored, since calls through Maritime's credits are kept indefinitely.

Questions

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

Cloudflare Sandbox SDK scores 67.5 (B) on agent readiness against Maritime's 66.5 (B), and leads in 3 of 7 scored categories. Maritime leads on schema & documentation, agent ergonomics, payments & pricing and maintenance & community.

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

No hosted endpoint is listed for Cloudflare Sandbox SDK. Maritime has a hosted endpoint at https://mcp.maritime.sh/mcp.

Are Cloudflare Sandbox SDK and Maritime open source?

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

Other comparisons with Cloudflare Sandbox SDK or Maritime

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