243+ iOS apps curated and reviewed
Every iPhone needs a few good rule of three calculator apps. We benchmark 243+ 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 | 2.3★ (4) | No | Yes | May 2026 | |
| 2 |  | Free | — | No | Yes | Aug 2026 | |
| 3 |  | Free | 5.0★ (2) | No | No | May 2026 | |
| 4 |  | Free | — | No | Yes | Jul 2026 | |
| 5 |  | Free | 5.0★ (3) | No | No | Jul 2026 | |
| 6 |  | Free | 4.8★ (20) | No | Yes | Aug 2026 | |
| 7 |  | Free | 4.9★ (409K) | Yes | No | Sep 2026 | |
| 8 |  | Free | 4.7★ (61K) | No | No | Sep 2026 |
This utility app helps you solve problems involving ratios and proportions. It calculates an unknown number based on the relationship between two other known numbers.
This utility app simplifies calculations for the Rule of Three, supporting both direct and indirect proportion modes. It is designed with accessibility in mind, optimized for VoiceOver and other assistive features.
This utility app helps users perform quick calculations for everyday scenarios like fuel consumption, currency conversion, and grocery shopping. It features a simple interface with options for result display customization and supports dark/light modes.
