Sandboxer vs Sandbox0

Sandbox0 gives AI agents persistent gVisor-isolated cloud sandboxes with snapshot, restore and fork, billed per GiB-hour of memory with no separate CPU charge. Default pause keeps files but starts fresh processes; memory pause is experimental. Pick Sandbox0 for memory-only billing and its checkpoint API; pick Sandboxer for a full-VM microVM with its own kernel, nested KVM and resume that brings processes back.

Checked against Sandbox0's public docs on October 24, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Sandbox0 compared
Capability	Sandboxer	Sandbox0
Isolation	microVM Cloud Hypervisor, its own kernel	gVisor guest The Docker-in-sandbox page says the privileged security class grants capabilities only inside the gVisor guest.
Full Linux with root	Ubuntu 24.04, sudo, systemd	Not stated on the official pages checked.
Docker inside	Preinstalled	Docker daemon can run inside a Sandbox0 Cloud sandbox (privileged security class, docker-enabled image; /var/lib/docker is ephemeral).
Nested virtualization (/dev/kvm)		Not stated on the official pages checked.
Pause and resume with memory	Running processes come back	partial Default pause/resume preserves files and starts fresh processes; memory pause is experimental and needs memory: true.
Fork a sandbox	Copy-on-write disk copy that boots fresh	Snapshot and fork accept a running or paused source sandbox.
HTTPS URL per port	Private with a token, or public	partial Public HTTP routes are configured through a services array.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	configurable ttl and hard_ttl Team quotas apply: 20 running sandboxes by default.
Billing	Per second, flat rate per size Stopped sandboxes are free	per second, by configured memory ($0.015/GiB-hour), storage $0.02/GiB-month Paused sandboxes incur no compute charge; no CPU charge.
GPUs		Not stated on the official pages checked.
Self-host or open source		Self-hosting support ended 2026-10-16; the old repo is a read-only Apache-2.0 archive and current runtime is closed source. BYOC is planned.
Regions	US East (Virginia) and EU Central (Finland)	Not stated on the official pages checked.

= not documented publicly.

Price for one 4 vCPU, 8 GB machine

Sandboxer

$0.036/hour

Flat per-second rate for the default size

Sandbox0

$0.12/hour

8 GiB × $0.015/GiB-hour (no separate CPU charge; CPU limits still apply); storage extra at $0.02/GiB-month

List prices from each provider's pricing page, before free credits, plans and storage. This compares price only.

Where Sandbox0 is strong

Memory-only pricing: no separate CPU charge, billed per second.
Paused sandboxes stop compute billing while keeping retained storage.
Snapshot, restore and copy-on-write style fork from running or paused sandboxes.
One-time $5 credit with no card required.

Where Sandboxer differs

Default Sandbox0 pause does not keep running processes (memory pause is experimental); Sandboxer resume restores processes.
Sandbox0 lists a 20 active-sandbox default quota; Sandboxer plans set concurrency from 100 up.
Sandbox0 sandboxes run in a gVisor guest and its pages do not state nested virtualization or regions; each Sandboxer sandbox is a full-VM microVM with its own kernel and /dev/kvm.
Sandbox0 self-hosting has ended; Sandboxer is also not self-hostable.

Pick Sandbox0 if

You want billing by memory only, with free CPU, and a prepaid credit model without a monthly plan.
You want snapshot/fork of sandboxes as a first-class API.
You want to start without a card (new users get $5 credit).

Pick Sandboxer if

Sandboxer gives each sandbox a full Ubuntu 24.04 VM with root, systemd and Docker preinstalled.
Sandboxer stop/resume keeps memory and running processes.
Sandboxer exposes any port as an HTTPS URL and bundles Claude Code, Codex and other coding agents.

Sources

Products change. If something here is out of date, email hello@sandboxer.com and we'll fix it. Sandbox0 is a trademark of its owner. Sandboxer is an independent product and is not affiliated with Sandbox0.

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