Fly.io

What does Fly.io do?

Fly Machines handle deployment and runtime by turning containers into lightweight virtual machines that launch instantly and run only when needed. The platform pairs hardware-isolated compute with private networking, granular routing, autoscaling, zero-downtime deploys, and automatic health checks so apps can move from launch to steady traffic without a lot of infrastructure glue. Sprites add isolated sandboxes for running AI-generated or otherwise untrusted code in under a second. At scale, Fly.io runs workloads across 18 regions and 6 continents, with sub-100ms response times in most world markets and tens of thousands of instances. The security model keeps tenants off shared kernels, encrypts traffic across the network, and backs the platform with SOC 2 Type 2 controls and BAAs. Customers including Supabase, Tailscale, Builder.io, and Mailgun use it for production workloads, while the docs and support pages show a workflow built around flyctl, CI/CD integration, and monitoring rather than a separate control plane.

Why use Fly.io?

• Hardware-isolated workloads reduce kernel-sharing risk and make multi-tenant compute easier to trust.
• Global private networking and granular routing let teams expose apps publicly or keep traffic internal.
• Fly Machines launch in milliseconds and support sub-second starts and stops for bursty workloads.
• The platform combines pay-as-you-go billing with machine reservations for teams optimizing steady-state costs.
• Support options include dedicated Slack access, architecture sessions, and guaranteed response times for higher tiers.

Who is Fly.io for?

• Application developers who want to ship containerized apps with minimal ops overhead.
• Platform engineers who need autoscaling, routing, and monitoring across distributed workloads.
• Security-conscious teams who need hardware isolation and encrypted private networking.
• Startups running production services that need fast deploys and pay-as-you-go compute.
• Teams building AI or untrusted-code workflows that need isolated sandboxes.

What are Fly.io's key features?

What does Fly.io integrate with?

• Rails
• Phoenix
• Django
• Node
• Laravel
• .NET
• Docker
• Phoenix Framework
• SvelteKit
• Ruby on Rails
• NextJS
• GitHub Actions
• GitHub
• GitLab
• Grafana
• Prometheus

What are Fly.io's use cases?

How does Fly.io work?

1. Connect your first app by deploying a container with Deploy any containerized application, then choose the runtime shape with Machines or Lightweight VMs for the workload you need.
2. Set up Private Networking or Global private networking so services can talk securely, and add Managed Postgres when your app needs a managed database layer.
3. Configure Granular Routing and Autoscaling to direct traffic and match capacity to demand, then use Automatic health checks to keep unhealthy instances out of rotation.
4. Wire in CI/CD integration from GitHub, GitHub Actions, GitLab, or Docker so every push can trigger a repeatable release with Zero Downtime Deploys.
5. Watch Monitoring, Prometheus metrics, and Real-time log shipping to spot regressions quickly, then keep iterating without changing platforms thanks to No Lock-In.

How much does Fly.io cost?

Frequently asked questions