Fly.io vs Vercel
Pricing
Fly.io: Free tier (3 shared VMs), usage-based from $1.94/mo per VM
Vercel: Free tier, Pro from $20/mo
Description
Fly.io: Deploy Docker containers to servers around the world with a single command
Vercel: Frontend cloud platform for deploying web applications with zero configuration
Pros
- 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
- Push to git and your site is live in under a minute, zero config
- Free tier covers hobby projects and early-stage startups with generous limits
- Preview deployments for every pull request so you catch issues before production
Cons
- 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
- Costs escalate fast once you hit scale: bandwidth and serverless function charges add up
- Some features (middleware, edge functions) lock you into the Vercel ecosystem
- If Vercel goes down, your site goes down. No easy migration path for Next.js-specific features
Details
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.
Vercel removes the gap between “code works on my machine” and “code works in production.” Push to GitHub, and your site is deployed. Every pull request gets its own preview URL. You never think about servers, CDN config, or SSL certificates.
Built for Next.js (they make it), but works with Astro, SvelteKit, Nuxt, and plain static sites too. The free tier is genuinely generous, enough for most side projects and early startups. The risk is cost at scale: once you start hitting real traffic, the jump from free to $20/month to hundreds of dollars can be abrupt. Plan your exit strategy before you build too deep.
Verified
