81+ iOS apps curated and reviewed
The best iapmo apps on iPhone average 2.8★ across 81+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | — | — | No | Sep 2026 | |
| 2 |  | Free | 3.8★ (6) | No | No | May 2026 | |
| 3 |  | Free | 1.4★ (5) | No | No | May 2026 | |
| 4 |  | Free | — | No | No | May 2026 | |
| 5 |  | Free | 4.5★ (102) | No | Yes | Sep 2026 | |
| 6 |  | Free | — | No | No | May 2026 | |
| 7 |  | Free | — | No | No | Aug 2026 | |
| 8 |  | Free | 1.3★ (3) | No | No | May 2026 |
Access and manage your purchased IAPMO codes, including the UPC, UMC, and others. Make annotations, record voice notes, and view content offline. Stay informed with code errata, committee information, and breaking news.
This tool helps engineers and plumbers accurately size water systems by calculating peak water demand. It accounts for water-efficient fixtures and appliances, allowing for custom flow rate adjustments and the addition of unlisted fixtures. Results can be saved and emailed.
