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Sandboxer vs Render

Render hosts web services, workers, cron jobs and Postgres from Git or Docker, and is testing Sandboxes in early access (2 CPU, 4 GB and 10 GB disk by default, 24 h maximum). Pick Render to host an app; pick Sandboxer for a full per-sandbox VM.

Checked against Render's public docs on October 27, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Render compared
CapabilitySandboxerRender
IsolationmicroVM
Cloud Hypervisor, its own kernel
Full Linux with root
Ubuntu 24.04, sudo, systemd
Docker inside
Preinstalled
partial
Deploys Docker images or Dockerfiles; Docker inside a service not documented.
Nested virtualization (/dev/kvm)
Pause and resume with memory
Running processes come back
partial
Early-access Sandboxes: runtime snapshots capture memory and CPU state; pause not described.
Fork a sandbox
Copy-on-write disk copy that boots fresh
partial
Early-access runtime snapshot can be restored to a new sandbox.
HTTPS URL per port
Private with a token, or public
partial
Each web service gets an onrender.com subdomain, but Render forwards public HTTP to only one port per service (default 10000).
Longest sessionNo limit on paid plans
Auto-stop is up to 30 days or off
24 h per sandbox (early access); services run continuously
Timeout cannot be raised.
BillingPer second, flat rate per size
Stopped sandboxes are free
GPUs
Self-host or open source
RegionsUS East (Virginia) and EU Central (Finland)Oregon, Ohio, Virginia, Frankfurt, Singapore
Sandboxes: Oregon only in early access.

= not documented publicly.

Where Render is strong

  • Five regions and managed Postgres, Key Value and cron.
  • Zero-downtime deploys, private networking and persistent disks.
  • Early-access Sandboxes with memory-inclusive snapshots.

Where Sandboxer differs

  • Render Sandboxes are early access, with 2 CPU, 4 GB and 10 GB disk by default (raisable on request), a 24 h limit that can't be raised, and Oregon only.
  • Render's main product is app hosting; Sandboxer is sandbox VMs.
  • Render sandbox filesystems are ephemeral.

Pick Render if

  • You are hosting a web app with database and workers.
  • You need several regions including Frankfurt and Singapore.
  • You want deploy-from-Git with managed Postgres.

Pick Sandboxer if

  • You need a full Ubuntu 24.04 VM with root, systemd, Docker and nested KVM rather than a container or job runner.
  • You want stop to save memory and disk and resume to bring running processes back, with stopped sandboxes costing nothing.
  • You want coding agents (Claude Code, Codex, OpenCode and others) preinstalled and driven through a prompt API, with per-second billing.

Sources

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

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