Sandboxer vs AgentComputer

AgentComputer provides cloud computers for agents that run in Firecracker instances on bare metal, with SSH, a browser, snapshots and ports that are public by default. Its docs do not cover pause, Docker or root. Sandboxer adds memory-keeping stop/resume, nested KVM and preinstalled coding agents; AgentComputer suits teams that want large RAM and storage presets and pure usage billing.

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

At a glance

Sandboxer and AgentComputer compared
Capability	Sandboxer	AgentComputer
Isolation	microVM Cloud Hypervisor, its own kernel	Firecracker microVM Runs on computer-host, a Firecracker-based hypervisor on bare metal.
Full Linux with root	Ubuntu 24.04, sudo, systemd
Docker inside	Preinstalled
Nested virtualization (/dev/kvm)
Pause and resume with memory	Running processes come back
Fork a sandbox	Copy-on-write disk copy that boots fresh	partial Snapshots restore into a new computer; no explicit fork command documented.
HTTPS URL per port	Private with a token, or public	Ports are public by default; --private requires an access session.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off
Billing	Per second, flat rate per size Stopped sandboxes are free	usage-based: CPU, RAM, hot and cold storage $0.07/CPU-h, $0.04375/GB-h; hot storage $0.000683/GB-h, cold $0.000027/GB-h.
GPUs
Self-host or open source
Regions	US East (Virginia) and EU Central (Finland)

= not documented publicly.

Price for one 4 vCPU, 8 GB machine

Sandboxer

$0.036/hour

Flat per-second rate for the default size

AgentComputer

$0.63/hour

4 vCPU x $0.07 + 8 GB x $0.04375 per hour (CPU and RAM only; storage extra; assumes 1 CPU = 1 vCPU)

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

Where AgentComputer is strong

Custom sizes up to 64 GiB RAM and 250 GiB storage, subject to host capacity.
Stopped computers use cold storage priced at $0.000027/GB-h.
Ports can be published public or private from the CLI.
About 3 GB/s NVMe file transfer.

Where Sandboxer differs

AgentComputer's docs do not state root, Docker, nested KVM, pause or max session; Sandboxer documents all of these.
Its CPU and RAM list price for 4 vCPU / 8 GB is about $0.63/h before storage; Sandboxer default is $0.036/h.
Snapshots restore to a new computer; the docs do not say memory is included.
AgentComputer lists a Linux computer plus macOS computers with limited features.

Pick AgentComputer if

You need more than 32 GiB RAM or large disks (custom sizes go up to 64 GiB RAM and 250 GiB storage).
You want macOS computers (with limited features).
You prefer pure pay-as-you-go with split hot and cold storage billing.

Pick Sandboxer if

You need Docker, systemd and nested KVM in a full Ubuntu VM.
You want stop/resume that preserves running processes.
You want coding agents preinstalled and a lower hourly price.

Sources

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

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