Vercel vs Fly.io
Compare Vercel and Fly.io side by side. Features, pricing, pros and cons to help you choose the right hosting platform.
🏆 Quick Verdict
Vercel and Fly.io serve fundamentally different use cases. Vercel excels at frontend deployment; Fly.io excels at running persistent backend services and full-stack apps close to users globally. Combining both is a common architecture.
Overall Scores
Vercel
Fly.io
Feature Comparison
Vercel Advantages
- ✓ Serverless Functions
- ✓ Preview Deployments
- ✓ Built-in Analytics
Both Have
- = Free Tier
- = Custom Domain
- = Free SSL
- = Edge Functions
- = Auto Deploy from Git
- = Global CDN
- = Team Collaboration
- = Environment Variables
Fly.io Advantages
- ✓ Docker Support
Pricing Comparison
Vercel
Free starting
- free: Available
- pro: $20/mo
- team: $20/mo
- enterprise: custom
Fly.io
Free starting
- free: Available
- pay-as-you-go: Available
- starter: $5/mo
- enterprise: custom
Pros & Cons
Pros
- + Fastest Next.js deployments (built by Next.js creators)
- + Instant preview URLs for every PR
- + Best-in-class Edge Network
- + Zero-config deployments
- + Excellent developer experience
Cons
- − Gets expensive at scale
- − Pro plan required for commercial use
- − Build minutes limited on free tier
- − No Docker/container support
Pros
- + Run VMs close to users in 30+ regions
- + Persistent volumes for stateful apps
- + Phoenix/Elixir optimized
- + Excellent for containerized full-stack apps
- + Pay-per-use pricing
Cons
- − Steeper learning curve (CLI-first)
- − No GUI-friendly dashboard
- − Credit card required even for free tier
- − No built-in preview deployments
In-Depth Analysis
Vercel is a frontend deployment platform first. Its strengths — instant global CDN, preview deployments, serverless functions, edge middleware — are optimized for stateless web applications and JAMstack architectures. There's no concept of persistent processes, long-running services, or TCP connections in Vercel's model.
Fly.io runs Docker containers on bare-metal servers in 30+ regions globally. Unlike traditional cloud providers where you pick a single region, Fly runs your app in multiple regions simultaneously and routes users to the nearest healthy instance. For latency-sensitive backends, this global-by-default architecture is unique.
The backend capability gap is significant. On Fly.io you can run PostgreSQL databases (via Fly Postgres), Redis, background workers, WebSocket servers, or any Docker-compatible service. Persistent disk volumes, private networking, and TCP routing are all supported. Vercel can't run these workloads — it's serverless functions only, with 10-second execution limits on hobby plans.
Pricing models differ substantially. Vercel charges primarily for bandwidth and function invocations. Fly.io charges for VM CPU and RAM by the hour (like a traditional VPS, but globally distributed). For always-on backend services, Fly's per-hour model is predictable. For traffic-based frontend hosting, Vercel's model is more natural.
Who Should Choose What?
Choose Vercel if:
Frontend applications, Next.js deployments, and stateless serverless workloads
Choose Fly.io if:
Persistent backend services, full-stack Docker apps, or workloads needing low-latency global routing
Ready to Get Started?
Try both platforms free and see which one feels right.