Fly

Fly.io is a platform designed for developers who want to ship code quickly and fearlessly. It provides a modern compute environment powered by sandboxes, enabling the deployment of any code with confidence. Fly Machines are hardware-virtualized containers that launch instantly and run only when needed, offering a balance of performance and cost-efficiency.

Key features include the ability to spin up hardware-isolated sandboxes (Sprites) for running AI-generated code safely, with checkpointing and restoration capabilities. The platform also offers fast local NVMe storage and global, durable object storage for persistent data. Built-in private networking, granular routing, and end-to-end encryption are provided automatically.

Fly.io's VMs are designed to handle a wide range of workloads, from applications to agents that scale to millions of users. The platform supports clustered databases like Cockroach, globally-distributed Postgres, and modern RPC systems like Elixir FLAME, without requiring Terraform. Deployments are available in 18 regions globally, ensuring low-latency response times for users worldwide.

The platform supports various frameworks, including Rails, Phoenix, Django, Node, Laravel, and .NET, and can generate containers for most popular frameworks even without a Dockerfile. Fly.io is trusted by teams at companies like Builder.io, Mercor, and Supabase, and offers enterprise-ready features such as KVM hardware isolation, a memory-safe Rust and Go stack, and CI/CD integration.

Fly.io aims to get out of the developer's way, providing infrastructure that allows running any code without fear. It offers pay-as-you-go billing based on usage, with options for micro VMs, persistent storage, and GPUs. Support plans are available starting at $29/month, and customers can save 40% by making a machine reservation.