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Sandboxer vs Leap0

Leap0 runs each sandbox in a Firecracker microVM with Jailer, with memory-and-disk pause, snapshots, SSH, VNC desktop and an MCP server. It is in a free public preview with sandboxes capped at 8 vCPU, 8 GB and 8 hours. Sandboxer offers larger sizes, no time limit on paid plans and nested KVM; Leap0 is a good fit while free preview pricing applies.

Checked against Leap0's public docs on October 24, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Leap0 compared
CapabilitySandboxerLeap0
IsolationmicroVM
Cloud Hypervisor, its own kernel
Firecracker microVM (with Jailer)
Linux 6.1 LTS kernel.
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
Pause captures memory and disk, and a paused sandbox resumes automatically on request.
Fork a sandbox
Copy-on-write disk copy that boots fresh
partial
Snapshots capture memory and disk; restoring creates a new sandbox from the checkpoint. Forking is not named.
HTTPS URL per port
Private with a token, or public
partial
sandbox.invoke_url() builds a URL to a running app; public/private details not documented.
Longest sessionNo limit on paid plans
Auto-stop is up to 30 days or off
1 minute to 8 hours
Default 5 minutes.
BillingPer second, flat rate per size
Stopped sandboxes are free
free during public preview
Pricing after preview not published in the fetched docs.
GPUs
Self-host or open source
RegionsUS East (Virginia) and EU Central (Finland)

= not documented publicly.

Where Leap0 is strong

  • Memory and disk pause with automatic resume on request.
  • Egress policy per sandbox via network_policy.
  • SSH, VNC, LSP, PTY and an MCP server are documented.
  • Free to use during the public preview.

Where Sandboxer differs

  • Leap0 caps a sandbox at 8 hours, 8 vCPU and 8 GB; Sandboxer allows no time limit on paid plans and up to 16 vCPU / 32 GB (xlarge, on the $100 plan or higher).
  • Docker, root and nested KVM are not documented for Leap0; Sandboxer has them.
  • Leap0 is a public preview with possible breaking changes; Sandboxer is early access with no SLA.
  • Leap0 disk is 10 GiB per sandbox; Sandboxer default is 50 GB.

Pick Leap0 if

  • You want to try Firecracker sandboxes at no cost during the preview.
  • You need Leap0's built-in code interpreter, LSP or desktop endpoints.

Pick Sandboxer if

  • You need Docker and nested KVM in a full Ubuntu VM.
  • You need sandboxes that run longer than 8 hours or exceed 8 vCPU.
  • You want coding agents preinstalled and predictable published pricing.

Sources

Products change. If something here is out of date, email hello@sandboxer.com and we'll fix it. Leap0 is a trademark of its owner. Sandboxer is an independent product and is not affiliated with Leap0.

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