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Fly.io

Runs apps as fast-booting micro-VMs in regions worldwide, billed by the second.

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About Fly.io

Fly.io runs your application as Firecracker micro-VMs, called Machines, in data centres around the world, so you can place apps and data close to users. You deploy with the flyctl CLI from a Dockerfile or a detected framework, and Fly handles TLS, anycast networking, private networking between apps, persistent volumes and autoscaling, including stopping Machines when idle and starting them again in under a second. Managed Postgres, object storage through Tigris and GPU Machines are also available. It is popular for Elixir and Phoenix apps, multiplayer and realtime services, and AI agent sandboxes. Pricing is pay-as-you-go with no monthly platform fee: Machines are billed by the second while running, storage and bandwidth are billed separately, and new users get a free trial. The control comes with more infrastructure concepts to learn than on Heroku-style platforms, and the CLI-first workflow suits developers who are comfortable with containers.

Best for: Developers who want apps running in many regions with per-second, VM-level control.

Pros and cons

What works

  • Run apps close to users in many regions
  • Machines boot fast and can stop when idle
  • Per-second billing with no platform fee

Why people leave

  • More infrastructure concepts than simple PaaS options
  • CLI-first workflow with a thinner dashboard
  • No permanent free tier, only a trial

Top Fly.io alternatives

See all 5
  1. 1Railway logo
    Railway

    Simpler dashboard-driven deploys with usage billing.

    66.5
  2. 2Render logo
    Render

    Easier Heroku-style platform when multi-region is not essential.

    62.6
  3. 3Koyeb logo
    Koyeb

    Serverless containers and GPUs with scale-to-zero across regions.

    59.6
  4. 4Cloudflare Workers logo
    Cloudflare Workers

    Edge functions in hundreds of locations for lighter workloads.

    57.2
  5. 5Northflank logo
    Northflank

    Container platform with jobs, databases and bring-your-own-cloud.

    55.3

Why people left Fly.io

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Fly.io: common questions

Is Fly.io free?

No, Fly.io is a paid product.

Is Fly.io open source?

No, Fly.io is not open source.

What platforms does Fly.io run on?

Fly.io is available for Web.

What are the best alternatives to Fly.io?

The highest-ranked Fly.io alternatives right now are Railway, Render and Koyeb. See the full ranked list for pricing, platforms and verified facts.

See all 5 Fly.io alternatives