Fly.io
Run apps as fast-booting VMs close to users.
Fly.io · checked Oct 22, 2026
What it is
Fly.io runs Docker apps as Firecracker micro-VMs in regions worldwide, billed per second.
Use cases
- →Global low-latency backends
- →Stateful apps with volumes
- →Per-user/agent sandboxes
Pros
- +Very cheap small machines
- +Global regions
- +Full VMs, not just functions
Cons
- −More ops knowledge needed
- −No real free tier
Where it ranks
- #6 Best Deployment & Hosting for Vibe Coders
Cheap global micro-VMs; needs more ops knowledge.
Compare Fly.io
FAQ
How much does Fly.io cost?
Pay as you go; e.g. shared-cpu-1x 256MB ≈ $2.19/mo. Volumes $0.15/GB-mo; egress from $0.02/GB. (As checked on 2026-10-22; confirm on https://fly.io/pricing/.)
What is Fly.io best for?
#6 in Best Deployment & Hosting for Vibe Coders: Global, stateful backends.
What are the best alternatives to Fly.io?
Railway (Deploy any service, database or worker with usage pricing); Render (Managed cloud for web services, workers and Postgres).
Is Fly.io open source?
No, Fly.io is a commercial product.