Sandboxer vs CircleCI

CircleCI is a hosted CI/CD platform where jobs run on Docker, Linux VM, macOS, Windows or GPU resource classes, billed in credits per minute. Sandboxer is not CI; its sandboxes persist and can pause with memory saved. Pick CircleCI for pipeline orchestration; pick Sandboxer for interactive and agent workloads.

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

At a glance

Sandboxer and CircleCI compared
Capability	Sandboxer	CircleCI
Isolation	microVM Cloud Hypervisor, its own kernel
Full Linux with root	Ubuntu 24.04, sudo, systemd
Docker inside	Preinstalled	Docker executor and Linux VM with remote Docker resource classes.
Nested virtualization (/dev/kvm)
Pause and resume with memory	Running processes come back	Not offered: CI machines are ephemeral and exist only for the length of a job.
Fork a sandbox	Copy-on-write disk copy that boots fresh	Not offered: CI machines are ephemeral and exist only for the length of a job.
HTTPS URL per port	Private with a token, or public	Not offered for CI jobs.
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	credits per minute by resource class $15 per 25,000 credits; Linux VM Large (4 vCPU) 20 credits/min.
GPUs		partial GPU resource classes (T4, A10G, P4, V100) on the Scale plan only.
Self-host or open source		partial Self-hosted runners on all plans (5 concurrent on Free); the control plane is SaaS.
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

CircleCI

$0.72/hour

Linux VM Large (4 vCPU / 15 GB, not 8 GB) × 20 credits/min × $0.0006/credit ($15 per 25,000) × 60

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

Where CircleCI is strong

Mature CI platform with Docker, Linux VM, Arm, macOS and Windows executors.
Self-hosted runners and GPU classes are available.
30,000 free credits a month on the Free plan.
Concurrency scales up through Performance and Scale plans.

Where Sandboxer differs

CircleCI jobs are short-lived; Sandboxer sandboxes persist and resume with processes running.
CircleCI bills credits per minute per resource class; Sandboxer bills per second and stopped sandboxes cost nothing.
CircleCI offers GPUs on the Scale plan; Sandboxer has none.

Pick CircleCI if

You need a full CI/CD pipeline system with macOS, Windows, Arm and GPU executors.
You want self-hosted runners alongside hosted ones.

Pick Sandboxer if

Need a long-lived machine you can stop, resume and reach over SSH or an HTTPS URL, not a machine that exists for one job.
Want coding agents preinstalled and a prompt API, MCP server, SDKs and CLI for driving them.
Need Docker, nested KVM and full root in a VM that can stop with memory saved and resume with processes running.

Sources

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

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