Vercel Sandbox vs Cloudflare Sandbox SDK
| Vercel Sandbox | Cloudflare Sandbox SDK | |
|---|---|---|
| Isolation | Firecracker microVM | V8 isolate + container |
| Cold start | 400ms | 50ms |
| Price / vCPU-hr | $0.128 | $0.072 |
| GPU | No | No |
| Session limit | 45min (Hobby) / 24h (Pro) | 30min execution cap |
| Persistence | Persistent by default | Durable Objects state |
| MCP support | — | Yes |
| Free tier | Included allowance on Hobby | Workers free tier for isolates |
| Best for | Teams already on Vercel building JS/TS AI apps. | Edge-native apps and teams already on Cloudflare Workers. |
The verdict
Choose Vercel Sandbox if teams already on vercel building js/ts ai apps. Choose Cloudflare Sandbox SDK if edge-native apps and teams already on cloudflare workers.
Headline rates rarely equal your bill — idle time, session length, creation fees and GPU minutes dominate. Model your actual workload in the cost calculator.
FAQ
Vercel Sandbox vs Cloudflare Sandbox SDK: which is better?
It depends on your priority. Cloudflare Sandbox SDK has the faster cold start (50ms vs 400ms), while Cloudflare Sandbox SDK is cheaper per vCPU-hour. Vercel Sandbox is best for teams already on vercel building js/ts ai apps. Cloudflare Sandbox SDK is best for edge-native apps and teams already on cloudflare workers.
Is Vercel Sandbox or Cloudflare Sandbox SDK cheaper?
Cloudflare Sandbox SDK is cheaper on the headline vCPU-hour rate ($0.072 vs $0.128). Total cost depends on idle time, session length and creation fees — use the cost calculator to model your workload.
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