Vercel Functions & Edge vs. Fly.io Firecracker MicroVMs — Interactive Cost & Performance Calculator
Compare Vercel Functions & Edge vs Fly.io Firecracker MicroVMs side-by-side. Use our interactive calculator to estimate exact monthly costs, savings, and performance trade-offs at your scale.
Vercel Functions & Edge
Best for: Next.js frontend teams & instant preview deploys
Fly.io Firecracker MicroVMs
Best for: Multi-region stateful Elixir, Go & Rust servers
Side-by-Side Technical & Commercial Breakdown: Vercel Functions & Edge vs. Fly.io Firecracker MicroVMs
| Dimension | Vercel Functions & Edge | Fly.io Firecracker MicroVMs |
|---|---|---|
| Platform Provider | Vercel | Fly.io |
| Base Monthly Plan | $20/mo | $10/mo |
| Compute Rate (per 1M reqs) | $0.65 | $0.14 |
| Storage / Bandwidth (per GB) | $0.150/GB | $0.150/GB |
| Typical Cold Start | 15–120 ms | 250 ms machine wake |
| Included Free Tier | Hobby tier for non-commercial projects | Pay-as-you-go resource consumption |
| Best Use Case | Next.js frontend teams & instant preview deploys | Multi-region stateful Elixir, Go & Rust servers |
Frequently Asked Questions
Which is more cost-effective in 2026: Vercel Functions & Edge or Fly.io Firecracker MicroVMs?
It depends on your workload volume. Use the interactive sliders above to model your exact monthly scale. Vercel Functions & Edge (Next.js frontend teams & instant preview deploys) and Fly.io Firecracker MicroVMs (Multi-region stateful Elixir, Go & Rust servers) have different unit economics that cross over as volume scales.
When should an engineering team choose Vercel Functions & Edge over Fly.io Firecracker MicroVMs?
Choose Vercel Functions & Edge when your primary priority is: Next.js frontend teams & instant preview deploys. Choose Fly.io Firecracker MicroVMs when you prioritize: Multi-region stateful Elixir, Go & Rust servers.