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Sandboxer vs Mastra Cloud

Mastra Cloud hosts projects built with the open-source Mastra framework, with observability, memory, persistent servers and a model gateway. It deploys agent applications; it is not a machine to run arbitrary code. Pick Mastra Cloud to operate a Mastra agent; pick Sandboxer when agents need an isolated Linux VM.

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

At a glance

Sandboxer and Mastra Cloud compared
CapabilitySandboxerMastra Cloud
IsolationmicroVM
Cloud Hypervisor, its own kernel
Full Linux with root
Ubuntu 24.04, sudo, systemd
Hosts Mastra projects; no machine access described.
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
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
persistent 24/7 server available
$100 per project on Starter and Teams.
BillingPer second, flat rate per size
Stopped sandboxes are free
plan plus CPU time and events
Starter $0, Teams $250/mo; CPU $0.35/h (Starter) or $0.25/h (Teams) over included; persistent server $100/project.
GPUs
Self-host or open source
Framework is Apache 2.0; Enterprise can deploy the platform on-prem or in your cloud.
RegionsUS East (Virginia) and EU Central (Finland)

= not documented publicly.

Where Mastra Cloud is strong

  • The framework is Apache 2.0 and can host agents anywhere.
  • Starter is free with unlimited users, deployments and projects.
  • Observability, memory and a model gateway are included.
  • Enterprise supports on-prem or in-VPC deployment.

Where Sandboxer differs

  • Mastra Cloud deploys one agent framework's apps; Sandboxer gives any code a full VM.
  • Mastra bills CPU time and events; Sandboxer bills per second for a machine.
  • Mastra's pricing page lists no regions, root, Docker or GPUs.
  • Mastra can be self-hosted; Sandboxer cannot.

Pick Mastra Cloud if

  • You build agents with the Mastra TypeScript framework and want hosting and tracing.
  • You want an open-source stack you can self-host.
  • You need workflow, memory and eval tooling in one framework.

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. Mastra Cloud is a trademark of its owner. Sandboxer is an independent product and is not affiliated with Mastra Cloud.

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