E2B vs Deno Sandbox

E2B and Deno Sandbox are closely matched on cold start and headline price. The decision comes down to isolation, session limits and ecosystem. Below: every spec that moves the decision, verified 2026-07-26.

	E2B	DEDeno Sandbox
Isolation	Firecracker microVM	V8 isolate
Cold start	150ms	n/a
Price / vCPU-hr	$0.05	$0.05
GPU	No	No
Session limit	Up to 24h	n/a
Persistence	Pause/resume with memory state, snapshots	Volume storage ($0.20/GiB-month); isolate compute
MCP support	n/a	n/a
Free tier	$100 one-time credit (Hobby)	Included in Deno Deploy Pro (40 CPU-h, 1000 GB-h, 5 GiB volume)
Best for	Teams that want the cleanest SDK and strong microVM isolation for agent code execution.	Running untrusted JS/TS or LLM-generated code inside a Deno Deploy app, billed only for CPU time used.

The verdict

Choose E2B for teams that want the cleanest SDK and strong microVM isolation for agent code execution. Choose Deno Sandbox for running untrusted JS/TS or LLM-generated code inside a Deno Deploy app, billed only for CPU time used.

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 Deno Sandbox: which is better?

It depends on your priority. E2B is best for teams that want the cleanest SDK and strong microVM isolation for agent code execution. Deno Sandbox is best for running untrusted JS/TS or LLM-generated code inside a Deno Deploy app, billed only for CPU time used.

Is E2B or Deno Sandbox cheaper?

E2B and Deno Sandbox list the same headline rate ($0.05 per vCPU-hour). Total cost depends on idle time, session length and creation fees. Model your workload in the cost calculator.

Still choosing between E2B and Deno Sandbox?

Tell us your workload and we'll point you to the better fit, then connect you with real pricing from the one you pick. No spam.