The honest version: Fly.io runs real containers close to your users and bills by the second, which is genuinely useful. As you grow, that pay as you go meter and the fact that it is still their platform start to matter. Here is the tradeoff.
Fly.io runs your app as real containers, not one framework's build output, and places them in regions close to your users so requests are fast worldwide. If low latency in several parts of the world matters to you, that global placement is a real advantage and it is not trivial to build yourself.
For a small app that benefits from running near users, Fly.io is a reasonable, honest choice today, and the pay for what you use model is friendly to a project that is mostly idle. The rest of this page is about what changes as the app becomes several apps and the meter keeps running.
Fly.io is pay as you go, and as of July 2026 there is no free tier. A mostly idle machine is cheap, but a busy app across a few machines, with volumes and bandwidth, is a bill that moves with your traffic and is hard to forecast. It is a good model until the month you get surprised, and it is still their platform, so the shape of your app is bound to it.
Burrow runs the same kind of containers on infrastructure you own instead: your own cluster, which can be a single cheap VPS for around five to twelve dollars a month. Burrow itself is free and open source, so adding another app does not add a platform fee, and your compute cost is a number you set rather than a meter you watch. Your apps are standard container images on a cluster you control, so there is no lock in.
And you operate it by talking to your AI coding agent: deploy, roll back, read logs and metrics, scale, and attach a Postgres database or a cache in one command, all on your own cluster. The guardrails you set gate the risky moves per environment, so you can lock production down while staging stays loose.
| On Fly.io | With Burrow | |
|---|---|---|
| Where your app runs | On Fly.io, their platform. You rent space on it. | On infrastructure you own: a cluster you control, even a single cheap VPS. |
| What you pay for | Their platform, priced per app or service and often per seat, plus usage. | The cluster you already pay for. Burrow itself is free and open source, a flat platform cost as you add apps. |
| Cost as you grow | Climbs with every extra service, seat, and unit of usage. | Mostly your own compute bill. Adding another app does not add a platform fee. |
| Lock in | Your build and runtime are shaped around their system. | Standard container images on your own cluster. Remove Burrow and your apps keep running. |
| Who operates it | You, clicking through their dashboard. | Your AI coding agent, in plain language, behind guardrails you set per environment. |
| Backing services | Their managed add ons, billed as separate services. | Postgres and a cache on your own cluster, attached in one command, with backups. |
| Rollback and safety | Rollback is there; the safety model is their defaults. | One command rollback with your last good release kept warm, plus guardrails and an audit trail of what the agent did. |
As of July 2026, Fly.io is pay as you go with no free tier. A minimal always on machine is around a couple of dollars a month, a small production setup runs roughly in the teens a month once you add volumes and bandwidth, and optional support plans start around twenty nine dollars a month. Pricing changes often, so check fly.io/pricing for the current numbers.
Burrow is free and open source. You pay only for the infrastructure you own. A single small VPS in the range of five to twelve dollars a month is enough to start, and adding more apps to it does not add a platform fee.
Prices are what we could confirm publicly as of July 2026 and are stated conservatively. Fly.io sets and changes its own pricing, so treat their published pricing page as the source of truth.
Install Burrow on a cluster you own, even a single cheap VPS, point your agent at it, and keep control of every deploy. Free and open source.
