AWS Lambda vs. Fly.io Firecracker MicroVMs — Interactive Cost & Performance Calculator
Compare AWS Lambda 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.
AWS Lambda
Best for: Deep AWS ecosystem event-driven microservices
Fly.io Firecracker MicroVMs
Best for: Multi-region stateful Elixir, Go & Rust servers
Side-by-Side Technical & Commercial Breakdown: AWS Lambda vs. Fly.io Firecracker MicroVMs
| Dimension | AWS Lambda | Fly.io Firecracker MicroVMs |
|---|---|---|
| Platform Provider | Amazon Web Services | Fly.io |
| Base Monthly Plan | $0/mo | $10/mo |
| Compute Rate (per 1M reqs) | $0.85 | $0.14 |
| Storage / Bandwidth (per GB) | $0.090/GB | $0.150/GB |
| Typical Cold Start | 80–350 ms | 250 ms machine wake |
| Included Free Tier | 1M requests + 400,000 GB-sec/mo | Pay-as-you-go resource consumption |
| Best Use Case | Deep AWS ecosystem event-driven microservices | Multi-region stateful Elixir, Go & Rust servers |
Frequently Asked Questions
Which is more cost-effective in 2026: AWS Lambda or Fly.io Firecracker MicroVMs?
It depends on your workload volume. Use the interactive sliders above to model your exact monthly scale. AWS Lambda (Deep AWS ecosystem event-driven microservices) 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 AWS Lambda over Fly.io Firecracker MicroVMs?
Choose AWS Lambda when your primary priority is: Deep AWS ecosystem event-driven microservices. Choose Fly.io Firecracker MicroVMs when you prioritize: Multi-region stateful Elixir, Go & Rust servers.