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 | n/a | 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 for teams already on Vercel building JS/TS AI apps. Choose Cloudflare Sandbox SDK for 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 leads on both cold start (50ms vs 400ms) and the headline vCPU-hour price. 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. Model your workload in the cost calculator.
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