Run full Docker apps at the edge in 30+ regions
Fly.io runs full Docker containers (not just functions) in 30+ regions globally. Postgres clusters, Volumes for persistent storage, and TCP/UDP networking — things Vercel/CF don't do. The trade-off: more ops complexity than git-push platforms. Pricing is per-second compute. Best for stateful services, multi-region databases, and apps that need TCP not HTTP.
The only reasonable way to run a globally-replicated Postgres.
We replicate Postgres across 6 regions on Fly. AWS Aurora is the alternative and 3x the price. Fly Machines start in 1ms — failover is genuinely fast.
Docker images, not framework-specific buildpacks.
We containerize everything. Fly takes our Dockerfile and runs it in 30 regions. No framework lock-in. The DX is more like "Heroku for Docker" than "Vercel for Next.js."
TCP-WebSocket support is the moat.
We're building Phoenix LiveView — needs WebSocket persistent connections. Most edge platforms can't. Fly handles 100K concurrent connections per app without sweating.
Methodology
Every review on this page is verified through GitHub OAuth and weighted by reviewer credibility, use-case match, and conflict-of-interest disclosure. Aggregate scores combine with recency decay so rankings reflect current reality. Read full methodology →
