Fly.io is an application platform that runs Docker containers on servers around the world — your app runs close to your users.
What You Get for Free (Free Tier)
- 3 shared VMs — enough for small apps
- 256MB RAM — per VM
- 3GB storage — persistent volumes
- 160GB bandwidth — outbound transfer
- Automatic SSL — HTTPS on custom domains
- Global deployment — 35+ regions worldwide
- Fly Machines — fast-booting VMs (300ms cold start)
- Private networking — WireGuard mesh between apps
- Fly Postgres — managed PostgreSQL
Quick Start
brew install flyctl
fly auth signup
fly launch # detects your app, creates Dockerfile if needed
fly deploy # deploys globally
# fly.toml
[build]
dockerfile = "Dockerfile"
[http_service]
internal_port = 3000
force_https = true
[[vm]]
memory = "256mb"
cpu_kind = "shared"
Why Developers Switch from Vercel/Railway
Vercel is for Next.js only, Railway's free tier is limited:
- Any Docker app — not locked to one framework
- Edge deployment — run in 35+ regions, not just US
- Persistent storage — volumes for databases, uploads
-
SSH access —
fly ssh consolefor debugging
A real-time game server on Railway had 200ms latency for EU users (US-only servers). After Fly.io: same app running in 5 regions, <30ms latency worldwide.
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