In This Comparison
3-10x faster development speed when using AI coding assistants
Source: McKinsey 2025
60-80% reduction in software development costs using AI-assisted coding
Source: McKinsey 2025
Side-by-Side Comparison
| Category | Fly.io | Vercel |
|---|---|---|
| Deployment Model | Global containers | Serverless platform |
| Pricing | Pay as you go | $20/mo |
| Best For | Containerised apps, APIs | Next.js web applications |
| Framework Support | Any containerised app | Next.js optimised |
| Control | Full infrastructure control | Managed, less control |
Fly.io
- Deployment Model
- Global containers
- Pricing
- Pay as you go
- Best For
- Containerised apps, APIs
- Framework Support
- Any containerised app
- Control
- Full infrastructure control
Vercel
- Deployment Model
- Serverless platform
- Pricing
- $20/mo
- Best For
- Next.js web applications
- Framework Support
- Next.js optimised
- Control
- Managed, less control
Winner by Category
Best for Nextjs
VercelBuilt for Next.js with best-in-class integration
Best for Flexibility
Fly.ioRun any containerised application globally
Best for Ease
VercelGit push deployment with zero configuration for supported frameworks
Our Recommendation
Use Vercel for Next.js and frontend-heavy applications. Use Fly.io for containerised backends, APIs, and applications needing global distribution.
“The best tool depends on what you are building and how you work. There is no universal winner. Pick the one that fits your workflow and budget, then ship something.”
When to Choose Each Tool
Choose Vercel
Deploying Next.js or frontend web applications
Choose Fly.io
Need containerised deployment with global distribution
Overview
Fly.io and Vercel are both modern deployment platforms but serve different use cases. Vercel is optimised for frontend and full-stack web applications, particularly Next.js, with serverless functions, edge middleware, and image optimisation. Fly.io deploys Docker containers to a global edge network, supporting any application that can be containerised: web servers, APIs, databases, and long-running processes.
Use Cases
Vercel is the obvious choice for Next.js applications and static sites. Its integration with Next.js features like ISR, middleware, and server components is unmatched. Fly.io is the right choice for backend services, API servers, WebSocket applications, and anything that needs persistent processes or custom runtime environments.
Frequently Asked Questions
Can I use both?
Yes, and many teams do. Deploy your frontend on Vercel and your backend API on Fly.io. This is a common and effective architecture.
Does Vercel support Docker?
No. Vercel uses its own build system for supported frameworks. If you need Docker, use Fly.io, Railway, or Render.
Which is cheaper?
Vercel is cheaper for simple websites. Fly.io is often cheaper for always-on backend services. Costs depend heavily on your usage patterns.
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