Rainbowy vs Greatest Common Factor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rainbowy
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.
- Minimalist drawing interface
- Classical music relaxation
- Draw on photos
- Save drawings with/without background
- Shake to save functionality
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This is a very simple but fascinating drawing app, suitable for kids and grown ups of all ages. Enjoy the revolutionary, ultrasimple minimalistic interface and relax with quality classical music while you create colorful rainbow drawings. When you are finished, simply shake the device and your work is saved. Rainbowy also lets you draw on photos and save your results with or without the background. It is so easy and entertaining to make colorful sketches with this app.
Greatest Common Factor
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.
- Find factors of a number
- Calculate GCF of two or more numbers
- Simplify fractions
- Understand number theory concepts
- Fraction simplification tool
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The factors of a number are all the integers that you can evenly divide into that number. The Greatest Common Factor (GCF) is the greatest integer that divides exactly into two or more numbers with no remainder. The Greatest Common Factor is used to simplify fractions. To simplify a fraction, you can divide the numerator and denominator of the fraction by the GCF of the numerator and denominator. Factors, the Greatest Common Factor, and simplifying fractions go hand-in-hand. Use this app to get the factors of a number, get the Greatest Common Factor of two or more numbers, and to simplify fractions.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Rainbowy | Greatest Common Factor |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 4.9 (7 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 7 — better | 1 |
| Update frequency | Every 6 days — better | Every 38 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 14.1 |
| Further details — not scored | ||
| Size | 38 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Martin Koppenhoefer | H Valeur |
Customer experience
Rainbowy
Greatest Common Factor
In-app purchases
Rainbowy
No in-app purchases
Greatest Common Factor
No in-app purchases
Questions
Is Rainbowy free?
Is Greatest Common Factor free?
Which has better reviews, Rainbowy or Greatest Common Factor?
Do Rainbowy or Greatest Common Factor have ads?
Which is updated more often, Rainbowy or Greatest Common Factor?
Other comparisons
