Sandboxer vs Deno Sandbox

Deno Sandbox runs code in Linux microVMs that start in under 200 ms and live up to 30 minutes per session, controlled via JavaScript or Python SDKs. Sandboxer instead gives a long-lived full Ubuntu VM with Docker and resumable processes. Pick Deno for fast, short, code-run jobs inside the Deno Deploy ecosystem.

Checked against Deno Sandbox's public docs on October 24, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Deno Sandbox compared
Capability	Sandboxer	Deno Sandbox
Isolation	microVM Cloud Hypervisor, its own kernel	Linux microVM Strict network egress policy via allowNet.
Full Linux with root	Ubuntu 24.04, sudo, systemd	Not stated on the official pages checked.
Docker inside	Preinstalled	Not stated on the official pages checked.
Nested virtualization (/dev/kvm)		Not stated on the official pages checked.
Pause and resume with memory	Running processes come back	Snapshots are documented as read-only filesystem images made from volumes; no memory snapshot or pause is documented.
Fork a sandbox	Copy-on-write disk copy that boots fresh	partial Many sandboxes can boot from one filesystem snapshot (root), and a new volume can be created from a snapshot; processes do not carry over.
HTTPS URL per port	Private with a token, or public	partial sandbox.exposeHttp(port) exposes HTTP for previews.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	30 minutes per session; extendable Lifetime is bound to a session; extendTimeout adds time; a sandbox can be promoted to a Deploy app.
Billing	Per second, flat rate per size Stopped sandboxes are free	usage-based: CPU time, memory time, volume storage $0.10/CPU-hour, $0.025/GiB-hour, $0.20/GiB-month volumes; Pro $20/mo and Builder $200/mo include usage.
GPUs		Not stated on the official pages checked.
Self-host or open source		Not stated on the official pages checked.
Regions	US East (Virginia) and EU Central (Finland)	Amsterdam (ams) and Chicago (ord); Asia planned

= not documented publicly.

Where Deno Sandbox is strong

Sandboxes start in under 200 ms according to Deno's FAQ.
JavaScript, Python and REST interfaces, with durable Volumes and filesystem snapshots.
Tight integration with Deno Deploy, including promoting a sandbox to a Deploy app.
Per-sandbox egress control with allowNet.

Where Sandboxer differs

Deno sessions are capped at 30 minutes (extendable); Sandboxer paid plans can run with no time limit.
Deno Sandbox gives 2 vCPU and 768 MB to 4 GiB of memory; Sandboxer sizes go up to 16 vCPU / 32 GB (xlarge, on the $100 plan or higher).
Deno documents filesystem-only snapshots; Sandboxer stop/resume keeps running processes.
Deno has two regions (ams, ord); Sandboxer runs in us-east and eu-central.

Pick Deno Sandbox if

You run short code-execution jobs and want sub-second startup from a JS or Python SDK.
You already deploy on Deno Deploy and want to promote a sandbox to an app.
You want a small usage-based bill with a $20 plan.

Pick Sandboxer if

Each Sandboxer sandbox is a full Ubuntu 24.04 VM with its own kernel, root/sudo, systemd and Docker preinstalled.
Stopping saves memory and disk and resume brings running processes back; stopped sandboxes cost nothing.
Coding agents (Claude Code, Codex, OpenCode and others) are preinstalled and driven through a prompt API, with an MCP server, REST API, CLI and TypeScript and Python SDKs.

Sources

Products change. If something here is out of date, email hello@sandboxer.com and we'll fix it. Deno Sandbox is a trademark of its owner. Sandboxer is an independent product and is not affiliated with Deno Sandbox.

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