# The Devil's Calculator vs 4=10

The clearest difference is update cadence: The Devil's Calculator at every 10 days against 4=10's every 2 months. The Devil's Calculator also leads on iOS requirement (10.0 vs 12.0). 4=10's advantage is ratings volume (2.6K vs 245) and review sentiment (98% vs 87%). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. The Devil's Calculator sells 1 one-off in-app purchase and 4=10 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 4=10. That said, the two scores are not equally well evidenced: 4=10 has 2.6K ratings behind it against 245, so its average is the more settled of the two. Written reviews are what separate them: 87% of The Devil's Calculator's written reviews are positive against 98% of 4=10's.

The Devil's Calculator ships an update every 10 days, 4=10 every 2 months. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | The Devil's Calculator | 4=10 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (245 ratings)](https://appshunter.io/ios/app/the-devils-calculator/id1447599858/reviews) | **[4.9 (2.6K ratings)](https://appshunter.io/ios/app/410/id1609871477/reviews)** |
| Number of ratings | 245 | **2.6K** |
| Positive reviews | 87.2% of reviews | **97.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 77 MB | 33 MB |
| Requires iOS | **10.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cinq-Mars Media](https://appshunter.io/developer/924648806) | [Sveinn Steinarsson](https://appshunter.io/developer/1477881290) |

## 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


### 4=10

[App page](https://appshunter.io/ios/app/410/id1609871477)

A casual number puzzle game for all ages. Combine four given numbers using basic math operations to reach the target of 10. It offers a relaxing experience that improves mental math skills and number familiarity.

**Highlights:** Combine four numbers to equal 10, Basic math operations, Gradually increasing difficulty, One-handed play, Improves mental math skills, Relaxing and soothing gameplay

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 4≠10 add-on | $3.99 | one-time |

**What reviewers like**

- 👍 Simple and fun
- 🧠 Helps improve math skills
- 🔒 No ads or in-app purchases
- 💡 Challenging yet relaxing

**What reviewers complain about**

- 🤔 Some levels too easy
- 🤯 Can get repetitive at times

**Reported bugs**

- None reported

**Requested features**

- Add more difficulty levels
- Introduce new gameplay modes


## Frequently asked questions

### Is The Devil's Calculator free?

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

### Is 4=10 free?

4=10 is free to download, with in-app purchases available.

### Which has better reviews, The Devil's Calculator or 4=10?

4=10 is rated higher. The Devil's Calculator averages 4.8 out of 5 from 245 ratings, while 4=10 averages 4.9 from 2.6K ratings.

### Do The Devil's Calculator or 4=10 have ads?

Neither The Devil's Calculator nor 4=10 shows ads.

### Which is updated more often, The Devil's Calculator or 4=10?

The Devil's Calculator ships an update every 10 days, and 4=10 every 2 months. Most recently, The Devil's Calculator was updated on October 16, 2026 and 4=10 on October 17, 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.*