Fly.io Has a Free API: Deploy Docker Containers Globally in 35 Regions With a Generous Free Tier and Built-In Postgres

Heroku killed its free tier. AWS is complex. Vercel is great for Next.js but not for a Go backend with WebSockets. Fly.io deploys any Docker container to 35 regions worldwide with a free tier that includes 3 shared VMs, 3GB persistent storage, and 160GB outbound bandwidth. What Fly.io Actually Does Fly.io is a platform that runs your Docker containers on bare-metal servers across 35 global regions. Unlike Heroku (which runs in one region), Fly.io places your app close to your users. Unlike AWS (which requires VPC/subnet/security group configuration), Fly.io needs one command. The architecture: you push a Docker image (or Fly.io builds it from a Dockerfile), specify which regions you want, and Fly.io handles networking, TLS, load balancing, and health checks. Your app gets an Anycast IP — users are automatically routed to the nearest instance. Fly.io also provides managed Postgres (free tier: 1 shared VM, 1GB storage), Redis, and S3-compatible object storage. Quick Start # Install flyct