E2B vs Cloudflare Sandbox SDK
| E2B | Cloudflare Sandbox SDK | |
|---|---|---|
| Isolation | Firecracker microVM | V8 isolate + container |
| Cold start | 150ms | 50ms |
| Price / vCPU-hr | $0.05 | $0.072 |
| GPU | No | No |
| Session limit | Up to 24h | 30min execution cap |
| Persistence | Pause/resume with memory state, snapshots | Durable Objects state |
| MCP support | n/a | Yes |
| Free tier | $100 one-time credit (Hobby) | Workers free tier for isolates |
| Best for | Teams that want the cleanest SDK and strong microVM isolation for agent code execution. | Edge-native apps and teams already on Cloudflare Workers. |
The verdict
Choose E2B for teams that want the cleanest SDK and strong microVM isolation for agent code execution. 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
E2B vs Cloudflare Sandbox SDK: which is better?
It depends on your priority. Cloudflare Sandbox SDK has the faster cold start (50ms vs 150ms), while E2B is cheaper per vCPU-hour. E2B is best for teams that want the cleanest SDK and strong microVM isolation for agent code execution. Cloudflare Sandbox SDK is best for edge-native apps and teams already on Cloudflare Workers.
Is E2B or Cloudflare Sandbox SDK cheaper?
E2B is cheaper on the headline vCPU-hour rate ($0.05 vs $0.072). Total cost depends on idle time, session length and creation fees. Model your workload in the cost calculator.
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