Semantic Coherence: Fly.io – Signal Evidence & AI Readability

[H2]
Modern Compute Without the Complexity
For builders who need compute that keeps up with their ideas, Fly Machines are hardware-virtualized containers that launch instantly and run only when you need them. Deploy an app in minutes or run untrusted code in isolated sandboxes.

[H2]
Sandboxes That Feel Like a Superpower
Spin up hardware-isolated sandboxes for running AI-generated code in complete safety. Every Sprite is a self-contained environment, ready for action in under a second. Checkpoint your entire environment, run anything, and restore if you break something. Pay only for actual CPU and memory consumption, down to the second.

Check Em Out!

[H2]
Storage That Keeps Up
Fast local NVMe for low-latency work, plus global, durable object storage for data that needs to stick around. Snapshot environments, persist state, and scale storage right alongside your sandboxes.

[H2]
Built-In Private Networking
Private networks per sandbox, granular routing, and end-to-end encryption — all automatic.

[H2]
VMs That Do Everything You Need
Everything runs on Machines: your apps, agents that scale to millions of users, and AI-generated code.

[H2]
Fork Off VMs Like They're Processes
Fly Machines start fast enough to handle HTTP requests, run only when you need them, and scale into tens of thousands of instances.

[H2]
Built for Distributed Systems
Run clustered databases like Cockroach, globally-distributed Postgres, and modern RPC systems like Elixir FLAME. No Terraform required.

[H2]
Get Right in Your Users' Faces
Deploy in 18 regions, from Sydney to São Paulo. Sub-100ms response times give users that native-app feel, no matter where they are.

Phoenix Framework

SvelteKit

Ruby on Rails

Docker

Django

Laravel

NextJS

[H2]
Agents Run Better on Sprites
You don't have to be a cloud guru to build scalable agents. Run every instance on its own VM with dedicated CPU, memory, networking, and a private filesystem. Forget wrestling with shared runtimes or noisy neighbors. Get persistent brains when you need them, ephemeral workers when you don't.

Build for scale from Day One

[H2]
Trusted by teams at

Builder.io

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Mercor

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Cogram

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Mocha

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Context

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Reflex

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Beam

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Imbue

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Supabase

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Webhound

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Hercules

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Builder.io

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Mercor

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Cogram

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Mocha

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Context

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Reflex

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Beam

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Imbue

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Supabase

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Webhound

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Hercules

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Single Sign-On

Guaranteed Support Response Times

SOC2 Type 2 Attested

Memory-safe Rust and Go stack

CI/CD Integration

[H2]
Build Whatever You Can Think Up (and Give Your Users The Same Power)
Fly.io is the platform that gets out of your way, running on the infrastructure that lets you run any code without fear. See how fast you can get started.

Spin Up a Sandbox

[H1]
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---
title: "Fly.io developer documentation"
layout: docs
toc: false
breadcrumbs: false
nav: firecracker
---
<div class="grid grid-cols-2 items-center">
<div>
## Ready to get started?
**Step 1:** Install `flyctl`
```cmd
brew install flyctl
```
<small>Not using `brew`? Check out the [installation guide](/docs/flyctl/install/)</small>
**Step 2:** Run `fly launch`
</div>
<figure>
<img src="/static/images/doc-main.png" alt="Illustration by Annie Ruygt of Frankie the hot air balloon waving to a bird sitting on a hour roof" class="w-full max-w-lg mx-auto">
</figure>
</div>
## Explore Fly.io by features
<div class="note">
<ul class="grid grid-cols-2 sm:grid-cols-3 text-lg font-medium gap-6 px-4 py-6">
<li><a href="/docs/machines/">Fly Machines</a></li>
<li><a href="/docs/volumes/">Fly Volumes</a></li>
<li><a href="/docs/security/">Security</a></li>
<li><a href="/docs/networking/">Networking</a></li>
<li><a href="/docs/mpg/">Managed Postgres</a></li>
<li><a href="/docs/kubernetes/">Fly Kubernetes</a></li>
<li><a href="/docs/database-storage-guides/">Database & Storage</a></li>
<li><a href="/docs/monitoring/">Monitoring</a></li>
</ul>
</div>
<div class="grid grid-cols-2 py-8">
<div>
## Get answers in your language
Or framework. You know what we mean. Check out the docs specific to your tech so you can move faster.
</div>
<div class="h-full">
<div class="grid grid-cols-3 h-full gap-2">
<a
href="/docs/elixir/getting-started/"
class="btn h-full rounded-xl"
>
Phoenix
</a>
<a
href="/docs/languages-and-frameworks/static/"
class="btn h-full rounded-xl"
>
Static
</a>
<a
href="/docs/rails/getting-started/"
class="btn h-full rounded-xl"
>
Ruby on Rails
</a>
<a
href="/docs/languages-and-frameworks/dockerfile/"
class="btn h-full rounded-xl"
>
Docker
</a>
<a
href="/docs/languages-and-frameworks/golang/"
class="btn h-full rounded-xl"
>
Go
</a>
<a
href="/docs/rust/"
class="btn h-full rounded-xl"
>
Rust
</a>
<a
href="/docs/django/getting-started/"
class="btn h-full rounded-xl"
>
Django
</a>
<a
href="/docs/laravel/"
class="btn h-full rounded-xl"
>
Laravel
</a>
<a
href="/docs/js/"
class="btn h-full rounded-xl"
>
JavaScript
</a>
</div>
</div>
</div>
<div class="flex justify-center">
## How does Fly.io work?
</div>
<figure>
<img src="/static/images/fly-map.png" alt="" class="w-full">
</figure>
<div class="grid grid-cols-2 items-center">
<figure>
<img src="/static/images/help.png" alt="Illustration by Annie Ruygt of Frankie the hot air balloon waving to a bird sitting on a hour roof" class="w-full max-w-lg mx-auto">
</figure>
<div class="space-y-2">
<h2>Could you use more help?</h2>
<p>Our Community forum and Support team have the answers.</p>
</div>
</div>
<div class="grid grid-cols-2 gap-6">
<div class="note">
<h3>Community Forum</h3>
<ul class="ml-1">
<li>Free to use</li>
<li>Discuss Fly.io with other users</li>
<li>See new Fly.io developments first</li>
<li>Searchable backlog</li>
<li>Quick answers to common issues</li>
</ul>
<a href="https://community.fly.io" class="btn mt-4">Learn more</a>
</div>
<div class="note">
<h3>Support</h3>
<ul class="ml-1">
<li>Plans start at $29/month</li>
<li>Guaranteed response time</li>
<li>Run by Fly.io engineers, not chat bots</li>
<li>Technical architecture support</li>
<li>Public metrics</li>
</ul>
<a href="https://fly.io/support" class="btn mt-4">Learn more</a>
</div>
</div>
[H1]
Fly.io developer documentation

[H2] Ready to get started?
Step 1: Install flyctl

Wrap text

Copy to clipboard

brew install flyctl

Not using brew? Check out the installation guide
Step 2: Run fly launch

[IMG: Illustration by Annie Ruygt of Frankie the hot air balloon waving to a bird sitting on a hour roof]

[H2] Explore Fly.io by features
Fly Machines
Fly Volumes
Security
Networking
Managed Postgres
Fly Kubernetes
Database & Storage
Monitoring
[H2] Get answers in your language
Or framework. You know what we mean. Check out the docs specific to your tech so you can move faster.

Phoenix

Static

Ruby on Rails

Docker

Go

Rust

Django

Laravel

JavaScript

[H2] How does Fly.io work?

[IMG: Illustration by Annie Ruygt of Frankie the hot air balloon waving to a bird sitting on a hour roof]

[H2] Could you use more help?
Our Community forum and Support team have the answers.
[H3] Community Forum

Free to use
Discuss Fly.io with other users
See new Fly.io developments first
Searchable backlog
Quick answers to common issues
Learn more

[H3] Support

Plans start at $29/month
Guaranteed response time
Run by Fly.io engineers, not chat bots
Technical architecture support
Public metrics
Learn more

Copy page as markdown
or

Open in ChatGPT

Report an issue
or
edit this page on GitHub

[H2]
Pay-as-You-Go Infrastructure
Micro VMs and persistent storage, oh my!

Learn More

[H2]
Serious Support
Access to our dedicated team of engineers. Starting at $29/month.

Learn More

[H2]
Pay up Front and Save
Get 40% off by making a machine reservation.

Learn More

[H2]
Enterprise-Ready
Need to run larger workloads with custom resource configurations, SLA requirements, or emergency support? We’ve got you covered.

Contact Sales

[H2]
Compliance Made Easy
Everything you need for HIPAA-compliant workloads, from BAAs to SOC2s, for just $99/month.

Get Started

[H2]
Accidental Deployments Are on the House
Maybe your CI/CD system screwed up and left a whole staging environment deployed. Or maybe you typed an extra zero on a scale command. Whatever it was: if you didn't expect it, and it looks weird on your bill, tell us. We'll waive or refund any unintended charges for paid support customers.

FlyCTL CLI: Orchestration from your terminal

Unlimited users per organization

Unlimited organizations

Aggregated billing across organizations

Private networking

SSO authentication

ACLs and Narrowly scoped tokens

[H2]
Features That Just Make Sense
Want to feel special? Check Under Your Seat! All Fly.io users take home these wonderful prizes (and more).

Start Now

[H2]
Trusted by teams at

Supabase

Tailscale

Tigris

Upstash

Turso

Mailgun

Fanatics

SavvyCal

Acast

Glide

Supabase

Tailscale

Tigris

Upstash

Turso

Mailgun

Fanatics

SavvyCal

Acast

Glide