# Rainbowy vs Greatest Common Factor

The clearest difference is update cadence: Rainbowy at every 6 days against Greatest Common Factor's every 38 months. Rainbowy also leads on ratings volume (7 vs 1) and iOS requirement (12.0 vs 14.1). On price, rating, ads and in-app purchases there is nothing between them.

Rainbowy costs $0.99 and Greatest Common Factor $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Rainbowy against 5.0 for Greatest Common Factor. That said, the two scores are not equally well evidenced: Rainbowy has 7 ratings behind it against 1, so its average is the more settled of the two.

Rainbowy ships an update every 6 days, Greatest Common Factor every 38 months. The most recent releases landed on October 8, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Rainbowy | Greatest Common Factor |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | [4.9 (7 ratings)](https://appshunter.io/ios/app/rainbowy/id1467288651/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/greatest-common-factor/id1573121817/reviews)** |
| Number of ratings | **7** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 38 months |
| Monetization | Paid | Paid |
| Size | 38 MB | 1 MB |
| Requires iOS | **12.0** | 14.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Martin Koppenhoefer](https://appshunter.io/developer/971718735) | [H Valeur](https://appshunter.io/developer/621824042) |

## What reviewers say

### Rainbowy

[App page](https://appshunter.io/ios/app/rainbowy/id1467288651)

A minimalist drawing application for all ages, featuring a simple interface and classical music for a relaxing creative experience. Users can draw on photos and save their colorful creations with or without the background.

**Highlights:** Minimalist drawing interface, Classical music relaxation, Draw on photos, Save drawings with/without background, Shake to save functionality

**In-app purchases:** none


### Greatest Common Factor

[App page](https://appshunter.io/ios/app/greatest-common-factor/id1573121817)

This app helps users find the factors of numbers, calculate the Greatest Common Factor (GCF) for two or more numbers, and simplify fractions. It's a useful tool for understanding number theory concepts and performing fraction simplification.

**Highlights:** Find factors of a number, Calculate GCF of two or more numbers, Simplify fractions, Understand number theory concepts, Fraction simplification tool

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

**In-app purchases:** none


## Frequently asked questions

### Is Rainbowy free?

Rainbowy costs $0.99, with no in-app purchases.

### Is Greatest Common Factor free?

Greatest Common Factor costs $0.99, with no in-app purchases.

### Which has better reviews, Rainbowy or Greatest Common Factor?

Greatest Common Factor is rated higher. Rainbowy averages 4.9 out of 5 from 7 ratings, while Greatest Common Factor averages 5.0 from 1 ratings.

### Do Rainbowy or Greatest Common Factor have ads?

Neither Rainbowy nor Greatest Common Factor shows ads.

### Which is updated more often, Rainbowy or Greatest Common Factor?

Rainbowy ships an update every 6 days, and Greatest Common Factor every 38 months. Most recently, Rainbowy was updated on October 8, 2026 and Greatest Common Factor on September 30, 2026.

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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.*