The best Fly.io alternatives fall into three camps: simple platforms that run the servers for you, container hosts that keep you in control of scaling, and edge runtimes for small functions close to users. Pick the camp before the brand, because moving to the wrong kind of host just shifts the same headaches somewhere new.
You probably picked your current host for fast virtual machines that start and stop in moments, close to your users. That's a great deal if you enjoy building your own platform out of parts. It's a tiring one if you'd rather push code and forget about it, or if you're now spending more evenings on plumbing than on the product.
The ten hosts below are listed in no particular order, alphabetically, and every description comes from the vendor's own website, so any promise you read is theirs, not mine.
Machine control or a finished platform?
Here's the decision most comparison posts skip. A machine-level host hands you raw virtual machines and lets you assemble the rest: networking, databases, volumes, deploy scripts. A finished platform sells all of that already put together, and you give up some control in exchange.
Neither is better. But if you're leaving because you're tired of wiring things together, and you land on another machine-level host, you'll be wiring things together again within weeks. And if you're leaving because you felt boxed in, a click-and-done platform will box you in even more.
A useful test: list the last five things that annoyed you about your current set-up. If most of them are about servers, networking or deploys, you want a finished platform. If most are about limits on what you can configure, you want a container host that gives you more knobs, ideally one that can run inside a cloud account you already own.
Signs you've outgrown a do-it-yourself host
- You've written your own scripts to handle things a platform would do for you, such as preview environments or zero-downtime deploys.
- Your database lives somewhere separate and nobody's quite sure who looks after backups.
- A customer has asked where their data is stored and you had to go and check.
- Your app now needs GPUs for inference and you're stitching that in from another provider.
- You only run a handful of small functions and a full virtual machine feels like overkill.
If two or more of those ring true, it's worth testing at least one host from a different camp to the one you're in now.
Ten app hosts at a glance
| Tool | Type | Good for |
|---|---|---|
| Cloudflare Workers | Edge runtime | Small functions served from cities worldwide |
| Deno Deploy | Edge runtime | JavaScript and TypeScript apps with a database |
| Google Cloud Run | Hyperscaler container service | Managed containers inside Google Cloud |
| Koyeb | Container platform | Autoscaling containers on CPUs or GPUs |
| Northflank | Container platform | Containers on its cloud or inside your VPC |
| Porter | Container platform | Apps deployed into your own AWS, GCP or Azure |
| Railway | Simple PaaS | One dashboard for apps, databases and logs |
| Render | Simple PaaS | Web services, workers, cron jobs and static sites |
| Scalingo | Simple PaaS | European hosting with managed databases |
| Zeabur | Simple PaaS | Deploys run by an AI agent from templates |
The ten hosts, A to Z
Cloudflare Workers
Best for: Small, fast functions that need to run near users worldwide, written in JavaScript, TypeScript, Python or Rust, with a free plan named on its page.
Deno Deploy
Best for: JavaScript and TypeScript projects that want Postgres, Prisma or Deno KV set up from the same dashboard, plus a free tier the vendor calls generous.
Google Cloud Run
Best for: Anyone already on Google Cloud who wants managed containers in Go, Python, Java, Node.js, .NET or Ruby without running servers.
Koyeb
Best for: APIs and inference work that need autoscaling containers on CPUs, GPUs or other accelerators from AMD, Intel and NVIDIA (vendor claim).
Northflank
Best for: Groups who want containers, databases, previews and AI agent workloads, either on its own cloud or fully managed inside their VPC.
Porter
Best for: Companies that must keep apps inside their own cloud account, with a ready path for leaving Heroku and SOC 2 and HIPAA claims on its page.
Railway
Best for: Small teams who want apps, databases, logs, metrics and traces in one place, with networking that needs no set-up.
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Render
Best for: Developers mixing static sites, web services, background workers and cron jobs who like preview environments and zero-downtime deploys.
Scalingo
Best for: European businesses that want Git-based deploys, managed databases and compliance built in, hosted in Europe.
Zeabur
Best for: Solo builders happy to let an AI agent handle deploys from a prompt, starting from a ready-made template.
Mistakes people make when switching app hosts
- Moving everything in one weekend. Move one service first and leave the rest where they are until it's been stable for a week.
- Forgetting persistent storage. Volumes, uploads and local files don't travel with your container image. Plan where they'll live before you switch.
- Ignoring regions. If your users are spread across continents, check where each host can run your app and your database, not just your app.
- Assuming free means the same thing everywhere. A free static site, a free monthly request allowance and a free tier for functions are three different deals.
- Skipping the export test. Before you commit, check how you'd get your data and config out again.
A short plan for moving day
- Containerise the app if it isn't already, so it runs the same on any host.
- Copy your database to the new host or a managed database and test against the copy.
- Set up environment variables and secrets, then run a staging deploy.
- Point a small slice of traffic at the new host and watch the logs for a few days.
- Switch DNS fully only once error rates and response times look the same or better.
If you're also weighing up a full move to a big cloud, my guides to AWS alternatives and Kubernetes alternatives cover the heavier end of the scale, and my list of cloud server hosting covers plain servers if you'd rather run everything yourself.
My advice for choosing your next app host
Decide how much of the stack you want to own before you look at a single sign-up page. If servers are the thing you're trying to escape, go to a finished platform and don't look back. If control is the thing you'll miss, stay with containers and pick a host that can run in your own cloud account later. Then run one real service on your top two for a week and let the logs choose.
Do you make app hosting or deployment software? Tool makers can ask to be considered for a featured place on this list.
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Frequently asked questions
What's the difference between a PaaS and a container platform?
A PaaS takes your code and runs it, handling servers, scaling and often databases for you. A container platform runs the container you build, which gives you more control but leaves more set-up to you.
Can I keep my database when I switch hosts?
Usually, yes. Export it, restore it on the new host or a managed database, and point your app at the new connection string. Test a copy before you switch real traffic.
Are edge runtimes a full replacement for virtual machines?
Not for everything. They suit small functions and JavaScript or TypeScript apps. Long-running processes, heavy background jobs or apps needing persistent disks usually fit a container host better.
Can I run a managed platform inside my own cloud account?
Yes, some platforms deploy into your own AWS, GCP or Azure account or your own VPC. That helps with compliance, because your data stays in an account you control.
Do app hosts offer GPUs?
A few container platforms list GPUs for inference. Check which regions have them before you plan around it, because GPU capacity is often limited to certain locations.
