# Aspect Ratio Pro — Rule of Three Calculator

> Calculates the fourth value in a proportion when three are known. (iPhone/iPad app by App ahead GmbH.)

- Source: https://appshunter.io/ios/app/aspect-ratio-pro/id6747417099 (this page in markdown: same URL + `.md`)
- Developer: [App ahead GmbH](https://appshunter.io/developer/955848754)
- Category: Utilities, Productivity
- Price: $3.99
- Rating: 4.00/5 from 1 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.6 · 24 MB
- Languages: American English, French (France), German (Germany), Hindi, Italian, Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2025-11-07
- Data updated: 2026-08-21
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/aspect-ratio-pro/id6747417099/reviews.md

## What is Aspect Ratio Pro?

Your new rule-of-three sidekick. Enter three values, and the app instantly finds the fourth. Perfect for calculating ratios and proportions when one value is missing.

⁂

Support
If you need help or want to make a feature suggestion, I’d love hearing from you → https://appahead.studio/help/

Feedback
Enjoying Aspect Ratio Pro? I’d love your support with a kind review on the App Store.

About
I’m Martin — designer, developer, and founder of App ahead. Since 2015, I’ve been creating ambitious apps for Apple devices, driven by a strong vision and thoughtful, forward-thinking design.

Terms of Use: https://appahead.studio/terms
Privacy Policy: https://appahead.studio/privacy

## Key features

- Rule of three calculations
- Instant fourth value calculation
- Ratio and proportion solver
- Intuitive input interface
- Supports iPhone and Mac

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/aspect-ratio-pro/id6747417099/reviews.md

### 5/5 — 非常实用

*2026-05-08*

建议加上一键清零功能

### 5/5 — Funktioniert

*2025-11-19*

Keine Raketenwissenschaft, aber macht den Dreisatz erheblich einfacher im Alltag.

### 4/5 — Great App w/ More Features Than Others

*2025-11-18*

Works as intended. Better than others I’ve tried. Nice customizations. Wish it actually listed the aspect ratio though.

**Developer response:** Thank you so much for your feedback! 👏 I’d love to improve the app. Could you tell me exactly what you mean by displaying the aspect ratio? Perhaps the smallest possible aspect ratio based on the values entered? I’d appreciate a quick email from you → martin@appahead.studio

### 5/5 — Extremely Useful!

*2025-11-09*

Thank you for making this high quality tool! :)

## Frequently asked questions about Aspect Ratio Pro

### What is Aspect Ratio Pro?

Aspect Ratio Pro is a utility app designed to quickly calculate the fourth value in a proportion when three values are provided. It simplifies ratio and proportion problems for users.

### How does Aspect Ratio Pro work?

You enter three known numbers into the app, and it instantly computes and displays the missing fourth number based on the rule of three principle.

### What devices is Aspect Ratio Pro available on?

Aspect Ratio Pro is available for both iPhone and Mac devices, allowing for versatile use across your Apple ecosystem.

### What is the price of Aspect Ratio Pro?

Aspect Ratio Pro is a paid application, available for $3.99. This one-time purchase grants you access to its full functionality.

### Does Aspect Ratio Pro have ads?

No, Aspect Ratio Pro does not contain advertisements. As a paid app, it offers an uninterrupted user experience.

### How often is Aspect Ratio Pro updated?

The latest version of Aspect Ratio Pro is 3.5, last updated on February 9, 2026. Updates typically bring improvements and new features.

### What is the age rating for Aspect Ratio Pro?

Aspect Ratio Pro has an age rating of 4+, making it suitable for a wide range of users, including younger individuals learning about proportions.

### Can I suggest new features for Aspect Ratio Pro?

Yes, the developer welcomes feature suggestions. You can reach out for support or to make a suggestion via the provided link: https://appahead.studio/help/

## Version history (last 5 releases)

### 3.6 — 2026-07-24

This update fixes an issue where entering certain mathematical characters caused the app to crash.

### 3.5 — 2026-02-09

This update includes several minor improvements.

### 3.4 — 2026-01-27

This update fixes a small issue that could occasionally cause the app to crash.

### 3.3 — 2026-01-05

New year, same rule of three—with a few minor improvements.

### 3.2 — 2025-11-11

A shake gesture now quickly resets the entered values.

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## More apps by App ahead GmbH

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All apps by App ahead GmbH: https://appshunter.io/developer/955848754

## Related topics

[aspect ratio pro](https://appshunter.io/ios/topics/aspect-ratio-pro) · [Rule of Three](https://appshunter.io/ios/topics/rule-of-three)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*