Monthly cost
$0+ / mo
$5+/mo; usage-based
Popularity
3/5
LLM knowledge
3/5
Difficulty
Medium
#edge
What Fly.io is good at
Strengths
- +Long-running processes
- +Global regions
- +Good for stateful apps
Tradeoffs
- −More ops than pure serverless
Coding-agent prompt
Drop into Claude / Cursor to get idiomatic Fly.io code.
You're working with Fly.io. Run full VMs or containers close to your users. Best practices: - Lean on: long-running processes - Lean on: global regions - Lean on: good for stateful apps Things to watch for: - Watch out for: more ops than pure serverless General guidance: - Canonical docs: https://fly.io — check here before inventing APIs. - Keep secrets in environment variables, never commit them. - Write TypeScript where the ecosystem supports it; add types to every exported function. - Add tests for the critical paths before declaring the task done. - Read-the-docs is usually faster than guessing — cite the docs page in code comments when you apply a non-obvious pattern.
Beginner's guide to Fly.io
In one line: Run full servers close to your users, in many regions at once.
Fly.io runs your app in multiple regions around the world. Unlike pure serverless, Fly gives you long-running VMs (virtual machines), which is great for apps that keep connections open (websockets, realtime).
Try it in your terminal
brew install flyctlInstall the Fly CLI on macOS (or see fly.io/docs for other systems).
fly launchInteractive setup — it'll detect your app and deploy it.
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