Purpose: Fly.io provides a "real computer" runtime environment for AI agents and hosts applications built by agents. Sources describe its positioning as enabling agents to prototype, iterate, and scale on the same set of underlying primitives, from the first sandbox all the way to production.
Main capabilities: Sprites are where agents run; when an agent stops, it goes to sleep, and when it wakes, the file system, running services, and installed dependencies remain as they were, and checkpoints can be set before high-risk changes with second-level rollback; Machines are hardware-isolated virtual machines that are claimed to start within one second, run close to users, and scale to tens of thousands when traffic arrives. Sprite Block Device provides a persistent file system, based on object storage, infinitely scalable, with disks growing by writes, a limit of 100 GB per Sprite, and billing only for actual bytes written. Sprites Connectors support configuring a connection to OpenRouter, GitHub, Slack, or any HTTP API once, with credentials not landing on the Sprite, permissions grantable by name, tag, or individual endpoint, and support for automatic key rotation. Every Sprite has an HTTPS URL.
How to use: The sources do not provide specific installation commands or operational steps, only stating that you can start for free, and that Sprites Block Device is currently in private testing and requires registration to obtain early access.
Applicable scenarios: personal agents (such as Hermes, Pi, Openclaw), running each MCP server independently, tool calls that require per-request state isolation, and deploying applications built by agents.
Limitations: The sources do not specify concrete pricing, quota details, or supported regions; Block Device is in private testing; the page mentions the use of analytics cookies on marketing and documentation pages to measure traffic and ad conversions, covering only unauthenticated visits.
