# The Devil's Calculator vs Color Gallery

The clearest difference is ads: The Devil's Calculator at none against Color Gallery's shown. The Devil's Calculator also leads on update cadence (every 10 days vs monthly) and iOS requirement (10.0 vs 13.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. The Devil's Calculator sells 1 one-off in-app purchase and Color Gallery sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for The Devil's Calculator against 4.9 for Color Gallery. Both are backed by a comparable volume of ratings — 246 and 284 respectively. Written reviews are what separate them: 85% of The Devil's Calculator's written reviews are positive against 91% of Color Gallery's.

The Devil's Calculator ships an update every 10 days, Color Gallery monthly. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | The Devil's Calculator | Color Gallery |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (246 ratings)](https://appshunter.io/ios/app/the-devils-calculator/id1447599858/reviews) | **[4.9 (284 ratings)](https://appshunter.io/ios/app/color-gallery-gradient-puzzle/id1534776473/reviews)** |
| Number of ratings | 246 | **284** |
| Positive reviews | 85.4% of reviews | **90.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Monthly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 77 MB | 489 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cinq-Mars Media](https://appshunter.io/developer/924648806) | [Chih Yuan Chou](https://appshunter.io/developer/1435854271) |

## What reviewers say

### The Devil's Calculator

[App page](https://appshunter.io/ios/app/the-devils-calculator/id1447599858)

This math puzzle game challenges you to decipher obscure operators on a calculator. Solve algebraic puzzles by working backward to understand the functions and purge the calculator of its demons. It's an addictive and educational experience with user-created levels and DLC.

**Highlights:** Obscure operator deciphering, Algebraic puzzle solving, User-created levels, DLC levels by mathematicians, Graphing mechanics, Hand-drawn artwork

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version of Game | $2.99 | one-time |

**What reviewers like**

- 💡 Most creative idea ever
- 🧠 Genius puzzle design
- 👍 Fun and educational
- 🚀 Brilliant game concept
- 🤓 Great for math lovers

**What reviewers complain about**

- 😠 Tedious late puzzles
- 🐛 Calculator responsiveness issues
- 🐛 Wolfram graphing feature doesn't work
- 🐛 Progress saving issues
- 🐛 Calculator malfunction

**Reported bugs**

- Some late puzzles with the third operator get too tedious with too much trial and error
- The built-in calculator needs some work and button responsiveness isn’t always the best.
- The graph to wolfram alpha function doesn’t seem to work.
- There’s unfortunately an exploit I accidentally discovered that allows you to bypass any level.
- The “real” calculator malfunctions when you want to use the answer you got previously, like if I input “330 * 2”, getting 660, then pressed “+6” on the next row, instead of showing 660 + 6 = 666, it’d show 2+6 = 8

**Requested features**

- Update the app
- Fix DLC Level 6
- More levels


### Color Gallery

[App page](https://appshunter.io/ios/app/color-gallery-gradient-puzzle/id1534776473)

Engage in a relaxing puzzle experience by rearranging colored polygon tiles to form beautiful mosaic art paintings. Challenge your logic and color perception with over 100 unique puzzles, playable offline. Save and share your completed artworks as wallpapers.

**Highlights:** Drag and reorder colored polygon tiles, Create mosaic art paintings, Offline puzzle gameplay, Over 100 unique puzzles, Save and share finished puzzles as wallpapers, Challenge color perception

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 😌 Relaxing and soothing gameplay
- 🎨 Beautiful color gradients and visual design
- ⏰ No timers or limited moves pressure
- 📱 Clean, simple, and intuitive interface
- 👍 Minimal and non-intrusive ads

**What reviewers complain about**

- 🐛 Broken ad removal purchase system
- 📺 Excessive ads after each puzzle piece
- 📺 Ads interrupt background music
- 👆 Poor touch input responsiveness
- ☀️ Bright white background causes glare

**Reported bugs**

- Purchase button error when removing ads
- Ads cannot be closed properly
- Game requires restart after each level
- Slow touch input registration
- Ads freeze or display incorrectly

**Requested features**

- Dark mode for nighttime play
- More puzzle levels and content
- Black background option to reduce glare
- Ability to create custom game levels
- Better touch input accuracy


## Frequently asked questions

### Is The Devil's Calculator free?

The Devil's Calculator is free to download, with in-app purchases available.

### Is Color Gallery free?

Color Gallery is free to download, with in-app purchases available.

### Which has better reviews, The Devil's Calculator or Color Gallery?

Color Gallery is rated higher. The Devil's Calculator averages 4.8 out of 5 from 246 ratings, while Color Gallery averages 4.9 from 284 ratings.

### Do The Devil's Calculator or Color Gallery have ads?

Color Gallery shows ads; The Devil's Calculator does not.

### Which is updated more often, The Devil's Calculator or Color Gallery?

The Devil's Calculator ships an update every 10 days, and Color Gallery monthly. Most recently, The Devil's Calculator was updated on October 24, 2026 and Color Gallery on October 29, 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.*