250+ iOS apps curated and reviewed
The best gammon technical products apps on iPhone average 4.3★ across 250+ titles — we've ranked them by what real users actually keep on their phones. Updated November 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | $9.99 | 3.6★ (10) | No | No | Oct 2026 | |
| 2 |  | $9.99 | 4.0★ (1) | No | No | Oct 2026 | |
| 3 |  | Free | — | No | No | May 2026 | |
| 4 |  | Free | 4.6★ (11) | No | No | Oct 2026 | |
| 5 |  | Free | 4.5★ (13) | No | No | Oct 2026 | |
| 6 |  | Free | 4.1★ (12) | No | No | Oct 2026 | |
| 7 |  | Free | 5.0★ (4) | No | No | May 2026 | |
| 8 |  | Free | 1.0★ (1) | No | No | Oct 2026 |
Calculate corrected API gravity for jet, gasoline, and diesel fuels at 60°F. This digital tool also determines the total weight of the fuel, replicating the functionality of physical slide calculators.
This application calculates the corrected API gravity at 60°F for jet, gasoline, and diesel fuels. It also determines the total weight of the fuel. It's a digital replacement for physical slide calculators.
