55+ iOS apps curated and reviewed
Out of 55+ direct proportion apps on iOS, 18 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | May 2026 |
| 2 |  | Free | 3.0★ (2) | Yes | No | Jul 2026 |
| 3 |  | Free | 4.7★ (16) | No | Yes | Aug 2026 |
| 4 |  | $4.99 | — | No | No | May 2026 |
| 5 |  | Free | 3.3★ (12) | No | Yes | Jul 2026 |
| 6 |  | Free | 2.0★ (2) | No | No | May 2026 |
| 7 |  | Free | — | Yes | No | May 2026 |
| 8 |  | Free | — | No | No | May 2026 |
This app provides step-by-step solutions for mathematical proportions. It's designed for students and math enthusiasts to learn, practice, and simplify calculations with an intuitive interface and theoretical resources.
Easily solve proportion problems by entering three of the four variables. This app provides detailed step-by-step solutions and saves all your calculations in a history for later review. Fractions, decimals, and constants are supported.
This utility app specializes in calculating proportions, solving for an unknown value in direct and inverse ratio equations. It handles scenarios like price increases and speed decreases, offering a simple yet effective tool for proportion-based problems.
This app helps you find the unknown value in proportions by showing step-by-step calculations. It's useful for various applications, from cooking to science, and offers a simple, fast, and visually appealing way to solve proportion problems.
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.
Easily calculate any ratio for design projects. Input a base ratio and either width or height to automatically determine the other dimension. Offers dark and light themes for usability in any lighting.
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 quickly calculates unknown values in everyday ratios. It features a clean interface for easy setup and instant results, making it ideal for school, work, or daily tasks.
This tool helps users calculate proportions based on the golden ratio (1:1.618). Input any one value, and it automatically computes the other two, aiding in the creation of aesthetically pleasing designs.
This app uses interactive visual exercises to teach the concept of proportion. Developed with a mathematics education professor, it guides users from intuitive exploration to symbolic representation, making math meaningful through hands-on problem-solving.
Easily calculate new image dimensions while preserving aspect ratio to avoid distortion. This tool helps graphic designers, photographers, and professionals accurately resize images for various needs, including blueprinting and sign making.
This app helps users find precise measurements based on popular mathematical ratios. It supports Golden, Silver, and Bronze ratios, allowing input of a known dimension to calculate the other. Results can be viewed in various units and are rounded for aesthetic appeal.
Easily calculate and save frequently used ratios with a clean, user-friendly interface. Ideal for scientific experiments, cooking, and design projects, this tool simplifies proportion management for enhanced learning and hobbies.
