InstaBox (instabox.sh), built by InsForge, is a cloud sandbox service made for AI agents — instead of running agent browser/automation work on your own machine, you spin up cloud machines and let the agent work there. It is currently an invite-based beta. I got in, activated the Free plan, and have been running two machines on it for about a week. Here is what is actually true about it.

What you get (Free plan)

Up to 5 machines; the agent-browser template is 4 vCPU / 8 GiB RAM / 20 GiB disk per machine

Files live on a persistent volume and survive pause, shutdown and reboot (only deleting the machine wipes them)

A real Chromium in the cloud your agent can drive, plus published HTTPS links / an SSH gateway to reach your services

Free plan is "never billed" in my account — the team describes the free tier as "free until we figure it out", so treat it as a generous beta, not a lifetime promise

What I used it for

A home base for browser automation that needs to stay logged in and reachable

Network…