Fly.io - App and VM Hosting for Code
Full-Stack Sandboxes for User or Robot Code
Fly.io introduces **Sprites**, durable Linux computers with writable root filesystems that launch in 1-2 seconds, support 100GB storage, and auto-sleep when idle.
Sprites feature instant checkpoints and restores, enabling recovery from errors like broken packages in one second without resets. They replace ephemeral read-only sandboxes, better suiting AI agents like Claude by providing persistent state for development, package installs, and long-running tasks.