# Graycode vs Rule of Three Calculator

The clearest difference is review sentiment: Graycode at 67% against Rule of Three Calculator's 0%. Graycode also leads on rating (3.0 vs 2.3) and in-app purchases (none vs 1). Rule of Three Calculator's advantage is price (Free vs $2.99) and iOS requirement (8.0 vs 12.0). On ratings volume, ads and device support there is nothing between them.

Rule of Three Calculator is free to download; Graycode costs $2.99 up front. Rule of Three Calculator sells 1 one-off in-app purchase. Graycode asks for nothing beyond the download.

Graycode holds the better App Store score, 3.0 against 2.3. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews point the same way: 67% of Graycode's written reviews are positive against 0% of Rule of Three Calculator's.

## The numbers

| Metric | Graycode | Rule of Three Calculator |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/graycode/id548428653/reviews)** | [2.3 (4 ratings)](https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | — |
| Monetization | Paid | **Free** |
| Size | 2 MB | 16 MB |
| Requires iOS | 12.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) | [Saran Dumronggittigule](https://appshunter.io/developer/1083622848) |

## What reviewers say

### Graycode

[App page](https://appshunter.io/ios/app/graycode/id548428653)

This utility converts numbers between decimal, hexadecimal, binary, and Gray code formats. Changes to one value automatically update the others, making it a convenient tool for engineers. It also features an animated demonstration of the Tower of Hanoi puzzle.

**Highlights:** Decimal, hex, binary, Gray code conversion, Real-time updates, Handy calculator for engineers, Animated Tower of Hanoi solution, Supports iPhone, iPad, iPod

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Rule of Three Calculator

[App page](https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300)

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.

**Highlights:** Ratio calculation, Proportion solving, Finds unknown numbers, Simple interface

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Graycode free?

Graycode costs $2.99, with no in-app purchases.

### Is Rule of Three Calculator free?

Rule of Three Calculator is free to download, with in-app purchases available.

### Which has better reviews, Graycode or Rule of Three Calculator?

Graycode is rated higher. Graycode averages 3.0 out of 5 from 2 ratings, while Rule of Three Calculator averages 2.3 from 4 ratings.

### Do Graycode or Rule of Three Calculator have ads?

Neither Graycode nor Rule of Three Calculator shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*