56+ iOS apps curated and reviewed
Out of 56+ direct proportion apps on iOS, 16 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 | 4.7★ (16) | No | Yes | Jul 2026 |
| 3 |  | $4.99 | — | No | No | May 2026 |
| 4 |  | Free | 2.0★ (2) | No | No | May 2026 |
| 5 |  | Free | 3.3★ (12) | No | Yes | Jul 2026 |
| 6 |  | Free | — | Yes | No | May 2026 |
| 7 |  | Free | 3.3★ (4) | No | No | May 2026 |
| 8 |  | Free | 3.0★ (69) | No | Yes | May 2026 |
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 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 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.
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.
Analyze facial proportions using your camera or gallery. This app calculates 12 key facial ratios against the ideal golden ratio, providing visual reports and an overall score. It emphasizes that proportion is not the sole determinant of beauty.
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.
This app simplifies fraction calculations and learning. It solves various fraction equations, shows detailed steps for understanding, and converts between decimals and fractions. It also helps find factors of numbers.
Solve proportion problems with ease by entering three of the four variables. This app provides detailed solution steps and saves all calculations in its history. Share your final results and easily manage your calculation history.
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 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 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 tool helps designers quickly calculate the Golden Ratio and Silver Ratio. Input your desired numbers and instantly see five levels of results presented visually. It simplifies complex calculations for design projects.
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.
Quickly calculate missing dimensions for layouts and designs based on various aspect ratios. Features presets like the golden ratio, custom inputs, and a live visual preview. Automatically copies results to your clipboard.