25+ iOS apps curated and reviewed
Every iPhone needs a few good efficiendcphase apps. We benchmark 25+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | May 2026 | |
| 2 |  | Free | — | No | No | May 2026 | |
| 3 |  | Free | — | No | No | Jul 2026 | |
| 4 |  | Free | — | No | No | May 2026 | |
| 5 |  | Free | — | No | No | May 2026 | |
| 6 |  | Free | — | — | No | Jul 2026 | |
| 7 |  | Free | 5.0★ (4) | No | No | May 2026 | |
| 8 |  | Free | 5.0★ (1) | No | No | May 2026 |
Calculate ventilation performance indicators like pressure losses, air velocity, and power consumption in pipe systems. Easily input pipe dimensions, material, and flow rate, then configure resistances from various fittings. Calculations can be saved or emailed, and the app functions offline.
