245+ iOS apps curated and reviewed
The best thermaflex duct calculator apps on iPhone average 3.7★ across 245+ titles — we've ranked them by what real users actually keep on their phones. Updated September 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 2.0★ (1) | No | No | May 2026 | |
| 2 |  | $19.99 | 4.5★ (189) | No | No | Sep 2026 | |
| 3 |  | Free | 4.6★ (32) | No | Yes | Sep 2026 | |
| 4 |  | Free | — | No | Yes | Jul 2026 | |
| 5 |  | $3.99 | 1.0★ (1) | No | No | Aug 2026 | |
| 6 |  | Free | — | No | Yes | Jun 2026 | |
| 7 |  | Free | — | No | Yes | Aug 2026 | |
| 8 |  | Free | 4.7★ (3) | No | Yes | Sep 2026 |
This utility app helps HVAC engineers quickly calculate the recommended Thermaflex duct size for installations. Input project volume and friction loss to determine the optimal duct size based on established industry standards.
This app allows HVAC professionals to quickly and accurately size new ducts or calculate the performance of existing ones. It supports both round and rectangular ductwork, offering precise calculations through direct entry or intuitive sliders. The tool provides live updates and outputs key performance metrics.
This app provides professional HVAC duct sizing and psychrometric calculations in a single tool. It offers detailed calculations for various duct types and materials, along with comprehensive humid air property analysis. Designed for HVAC professionals, it replaces traditional ductulators with accurate digital functionality.
