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Sandboxer vs Google Cloud Build

Google Cloud Build is a managed build service: each build runs a sequence of container steps on a default pool or a private pool. It is a CI product with per-build-minute billing, not an interactive machine. Pick it for builds inside Google Cloud; pick Sandboxer when you need a persistent VM an agent can use.

Checked against Google Cloud Build's public docs on October 28, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Google Cloud Build compared
CapabilitySandboxerGoogle Cloud Build
IsolationmicroVM
Cloud Hypervisor, its own kernel
own worker per build; each step runs in a Docker container
Docs: each build runs on its own worker, isolated from other workloads, in the default pool or a private pool.
Full Linux with root
Ubuntu 24.04, sudo, systemd
Docker inside
Preinstalled
Each build step runs as a Docker container (docker run).
Nested virtualization (/dev/kvm)
Pause and resume with memory
Running processes come back
Fork a sandbox
Copy-on-write disk copy that boots fresh
HTTPS URL per port
Private with a token, or public
Longest sessionNo limit on paid plans
Auto-stop is up to 30 days or off
BillingPer second, flat rate per size
Stopped sandboxes are free
per build minute by machine type
Default pool: e2-medium $0.003/min, e2-standard-2 $0.006/min, e2-highcpu-8 $0.0156/min; partial minutes billed by the second; 2,500 free build-minutes per billing account per month on e2-standard-2; queued time not billed.
GPUs
Self-host or open source
Managed Google Cloud service; private pools are still Google-hosted.
RegionsUS East (Virginia) and EU Central (Finland)multiple Google Cloud regions
Prices vary by region.

= not documented publicly.

Where Google Cloud Build is strong

  • It has a free tier of 2,500 build minutes a month on e2-standard-2.
  • Billing is per build-minute, with partial minutes billed by the second and queued time not charged.
  • Machine types reach high-CPU sizes such as e2-highcpu-32.
  • Private pools add more machine and network options.

Where Sandboxer differs

  • Cloud Build is a CI service where builds end; Sandboxer sandboxes are long-lived machines.
  • Cloud Build has no pause/resume or fork of a running machine.
  • Cloud Build's default pool has no 4 vCPU machine; private pools list e2-standard-4 (4 vCPU / 16 GB) at $0.012 per minute, so there is no exact 4 vCPU / 8 GB price comparison.
  • Cloud Build integrates with Google Cloud IAM and artifacts; Sandboxer is cloud-neutral.

Pick Google Cloud Build if

  • Your pipeline and artifacts already live in Google Cloud.
  • You want per-minute CI billing with a free monthly allowance.
  • You need private pools inside a VPC.

Pick Sandboxer if

  • You need a full Ubuntu VM with root, systemd and Docker inside a microVM with its own kernel.
  • You want stop/resume that keeps running processes and memory, and forks from disk snapshots.
  • You want coding agents (Claude Code, Codex and others) preinstalled and driven through a prompt API.

Sources

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

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