Run User (or Robot) Code on Fly Machines

Give each of your users (or robots) a code execution sandbox that boots in milliseconds, runs any Docker image you throw at it, and scales to zero when you don't need it.

Deploy in 5 minutes

Full-Stack Sandboxes.

Fly.io Metal.

Fly Machines are hardware-virtualized containers with a REST API, that can run any Docker image on our custom-built global cloud in 35 regions. Launch instantly and keep them running as long as you want them to – for a single HTTP request, or weeks of uptime.

  • User-Specific Routing

    Route each user (or robot) to their own dedicated sandbox with dynamic request routing using the Fly Proxy and fly-replay.

  • Persistent Storage

    Give each of your users (or robots) their very own dedicated storage with Fly Volumes, Fly Managed Postgres, and S3-compatible Tigris Data.

  • Zero-Cost When Idle

    Fly Machines automatically scale to zero when you don't need them, so you only pay for the compute you actually use.

  • MCP Servers

    Build remote Model Context Protocol (MCP) servers on Fly Machines to plug your sandbox into any LLM workflow.

Support By Developers For Developers

Paid support packages include a team of actual engineers (not chatbots) who themselves ship code on our platform. Emergency support and guaranteed response times available.

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Secure by Default

Apps running on Fly Machines are KVM hardware-isolated, built on a memory-safe stack and running directly on our own metal.

Enterprise Features
Fly.io Security
  • Single Sign-On
  • Guaranteed Support Response Times
  • SOC2 Type 2 Attested
  • Memory-safe Rust and Go stack
  • CI/CD Integration

Trusted by teams at

Use the Tech You Love

Build with your favorite framework. No Dockerfile? No problem: our CLI generates containers for most popular frameworks, including Rails, Phoenix, Django, Node, Laravel, and .NET.

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Need Thousands of Fly Machines?

If you're building something that requires Fly Machines by the thousands, we're here to help. We'd love to talk through your architecture and ensure you can scale effortlessly.

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