Clear duct calculations. Organized jobs.

Ductfolio helps you size and compare rigid round and rectangular HVAC ducts on your iPhone. Your calculations and jobs stay on your device.

Start with the essentials

Calculate duct sizes and save a job for free. Pro adds tools including fit-to-space, pressure-loss assistance, additional saved jobs and professional exports. Pro is a one-time purchase, not a subscription.

Built for practical work

Review airflow, velocity, friction and assumptions. Exported reports and backups are shared only when you choose a destination. Use engineering judgment and verify applicable project requirements.