# Mathrax vs 15 ﾠ

The clearest difference is in-app purchases: 15 ﾠ at none against Mathrax's 1. 15 ﾠ also leads on ads (none vs shown) and update cadence (weekly vs every 5 months). Mathrax's advantage is rating (5.0 vs 4.6). On price, review sentiment and device support there is nothing between them.

Both are free to download. Mathrax sells 1 one-off in-app purchase. 15 ﾠ asks for nothing beyond the download.

Mathrax holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: 15 ﾠ has 14 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Mathrax ships an update every 5 months, 15 ﾠ weekly. The most recent releases landed on October 8, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Mathrax | 15 ﾠ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/mathrax-sudoku-and-maths/id645221113/reviews)** | [4.6 (14 ratings)](https://appshunter.io/ios/app/15/id863114572/reviews) |
| Number of ratings | 2 | **14** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 2 MB |
| Requires iOS | 15.0 | **7.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stanley Lam](https://appshunter.io/developer/453164363) | [Denis Tokarev](https://appshunter.io/developer/716625840) |

## What reviewers say

### Mathrax

[App page](https://appshunter.io/ios/app/mathrax-sudoku-and-maths/id645221113)

This logic puzzle challenges you to fill grids with numbers based on specific mathematical and parity rules. It offers a vast amount of content with multiple board sizes, difficulty levels, and over 500 unique levels. Features include automatic error highlighting, progress saving, and time tracking.

**Highlights:** Number placement logic puzzles, Mathematical operation conditions, Parity (even/odd) conditions, Multiple board sizes and difficulty levels, Over 500 unique levels, Automatic wrong number highlighting, Autosave unfinished levels, Best completion time recording

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Full Version | $0.99 | one-time |


### 15 ﾠ

[App page](https://appshunter.io/ios/app/15/id863114572)

A classic sliding tile puzzle game where you rearrange numbered tiles to achieve sequential order. Offers customizable colors and various board sizes for a personalized experience. Compete with others via Game Center leaderboards.

**Highlights:** Sliding tile puzzle gameplay, Customizable colors, Multiple board sizes (3x3 to 8x8), Game Center leaderboards, No ads or in-app purchases

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mathrax free?

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

### Is 15 ﾠ free?

15 ﾠ is free to download, with no in-app purchases.

### Which has better reviews, Mathrax or 15 ﾠ?

Mathrax is rated higher. Mathrax averages 5.0 out of 5 from 2 ratings, while 15 ﾠ averages 4.6 from 14 ratings.

### Do Mathrax or 15 ﾠ have ads?

Mathrax shows ads; 15 ﾠ does not.

### Which is updated more often, Mathrax or 15 ﾠ?

Mathrax ships an update every 5 months, and 15 ﾠ weekly. Most recently, Mathrax was updated on October 8, 2026 and 15 ﾠ 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.*