🚀 Hosting & Infrastructure Comparison
Coolify vs Fly.io
A detailed comparison to help you choose the right tool for your needs.
Last updated: 2026-02-06
Coolify
Free (self-hosted), Cloud from $5/mo
Strengths
- + Completely free if you self-host on your own VPS — no per-app or per-user fees
- + Supports databases, apps, static sites, and one-click services (Plausible, Ghost, etc.)
- + No vendor lock-in — your infrastructure runs on a standard VPS you control
Weaknesses
- − Self-hosting means you are responsible for server maintenance, updates, and backups
- − Smaller community than mainstream PaaS — fewer tutorials and Stack Overflow answers
- − Initial setup requires comfort with SSH, DNS, and basic Linux server administration
Fly.io
Free tier (3 shared VMs), usage-based from $1.94/mo per VM
Strengths
- + Run your app in 30+ regions close to users — real global distribution, not just CDN caching
- + Free tier includes 3 shared-cpu VMs with 256MB RAM each — enough for small apps
- + Built-in Postgres, Redis, and object storage so you can run a full stack
Weaknesses
- − Steeper learning curve than Railway or Render — you need to understand Dockerfiles and fly.toml config
- − Billing can be unpredictable — outbound bandwidth costs and machine scaling add up
- − Support response times on free tier are slow — community forum only
The verdict
Which one is right for you?
Choose Coolify if you want
- → Completely free if you self-host on your own VPS — no per-app or per-user fees
- → Supports databases, apps, static sites, and one-click services (Plausible, Ghost, etc.)
Choose Fly.io if you want
- → Run your app in 30+ regions close to users — real global distribution, not just CDN caching
- → Free tier includes 3 shared-cpu VMs with 256MB RAM each — enough for small apps
In depth
About each tool
Coolify
Open-source, self-hostable alternative to Heroku and Netlify — deploy anything on your own server
Coolify is an open-source platform that gives you Heroku-like deployment on your own server. Install it on a $5/month VPS (Hetzner, DigitalOcean, whatever), and you get git-push deploys, automatic SSL, database provisioning, and a dashboard — all without paying per-app fees. Your $5 VPS can run multiple apps and databases that would cost $50+ on Railway or Render.
The trade-off is real: you manage the server. Updates, disk space, backups, security patches — that is on you. Coolify handles the deployment layer, but the underlying server is your responsibility. For founders who are comfortable with basic server admin and want to keep hosting costs under $10/month for multiple projects, Coolify is the best deal in hosting. For those who would rather not think about servers at all, stick with a managed platform.
Fly.io
Deploy Docker containers to servers around the world with a single command
Fly.io takes your Docker container and runs it on servers around the world. Your app in Tokyo, Sao Paulo, and Amsterdam simultaneously — not behind a CDN, but actually running there. For apps where latency matters (real-time features, APIs, databases), this is the real deal.
The free tier gives you 3 shared VMs with 256MB RAM each, which can run a small app and a Postgres database. Beyond that, pricing is usage-based starting at $1.94/month for a shared-cpu VM. The tradeoff versus Railway or Render is complexity: Fly gives you more control over where your code runs, but you need to understand containers, config files, and networking basics. If you just want to push code and forget about it, Railway is easier. If you want your API to respond in under 50ms for users worldwide, Fly.io is worth the setup.
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