HEAD-TO-HEAD · PRICES VERIFIED 2026-08-27

Modal (Sandboxes) vs Fly Machines

Modal (Sandboxes) and Fly Machines have no comparable captured rates — both render unranked in our engine, so no computed verdict exists. Compare their published plans directly via each row's source links.

Monthly Cost Across Realistic Benchmarks

100 hr × 1 vCPU / 2 GiB

Modal (Sandboxes): $11.90 Fly Machines: unranked

Not comparable — missing captured rates

500 hr × 2 vCPU / 4 GiB

Modal (Sandboxes): $119.00 Fly Machines: unranked

Not comparable — missing captured rates

2,000 hr × 4 vCPU / 8 GiB

Modal (Sandboxes): $952.00 Fly Machines: unranked

Not comparable — missing captured rates

Rate Card Snapshot

Vendor	$/vCPU-hr	$/GiB-hr	Billing granularity	Concurrency note
Modal (Sandboxes)	$0.0710	$0.0240	per-second	Concurrency scales with plan; Starter $30/mo credits, Team $250/mo incl. $100/mo credits, Enterprise custom.
Fly Machines	—	incl.	per-second	—

Fit Notes

Modal (Sandboxes) — Skip if pure sandbox price is the decision — you pay ~40% over E2B/Daytona for the same vCPU-hour; Modal earns it back only when the rest of your stack already lives on Modal functions.
Fly Machines — Skip if you need a single per-vCPU+per-GiB price — Fly sells bundled presets that don’t decompose into our two-axis model; compare preset totals directly.

Modal (Sandboxes)

Strengths

Gotchas

Fly Machines

Strengths

Gotchas

Run your own workload through the full interactive calculator, or browse all pairs on the comparisons hub.

Frequently Asked Questions

Which is cheaper, Modal (Sandboxes) or Fly Machines?

How were these Modal (Sandboxes) vs Fly Machines costs computed?

Both vendors run identical workload profiles (sandbox-hours × vCPU/RAM) through the same engine using each vendor's captured USD list rates; the full methodology is on the agent-sandbox-pricing tool page.