Fly.io

Development

Definitions

  1. A platform for deploying full-stack applications and databases close to users worldwide using lightweight virtual machines (Firecracker microVMs). Unlike traditional cloud platforms that deploy to a single region, Fly.io makes multi-region deployment straightforward: your app runs in data centers near your users with automatic request routing. It supports any Docker container, has built-in PostgreSQL and Redis hosting, and provides features like automatic TLS, private networking between apps, and machine scaling. Fly.io gained a devoted following among developers who wanted the simplicity of Heroku with the global distribution of a CDN. Its 'Machines' API enables programmatic VM creation, making it popular for running AI inference workloads and ephemeral development environments.

    In plain English: A hosting platform that runs your apps in small, fast virtual machines around the world, close to your users. Deploy with a single command and your app is globally distributed.

    Example: Our API runs on Fly.io in six regions. Users in Tokyo hit the Tokyo instance, users in London hit the London one. Latency dropped 3x.