# Crush9×9 vs Subtraction App

The clearest difference is in-app purchases: Crush9×9 at none against Subtraction App's 1. Crush9×9 also leads on iOS requirement (11.0 vs 14.0). Subtraction App's advantage is update cadence (every 2 weeks vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Subtraction App sells 1 in-app purchase, starting at $1.99 per month. Crush9×9 asks for nothing beyond the download.

Crush9×9 ships an update every 6 weeks, Subtraction App every 2 weeks. The most recent releases landed on October 4, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Crush9×9 | Subtraction App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/crush99/id1505916500/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | Ad-supported | — |
| Size | 109 MB | 26 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ZERONE](https://appshunter.io/developer/1708775781) | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) |

## What reviewers say

### Crush9×9

[App page](https://appshunter.io/ios/app/crush99/id1505916500)

A quick brain training game that sharpens your mind in just 5 minutes a day. Solve multiplication problems by tapping the correct numbers to form equations. Suitable for all ages, it's a fun way to exercise your brain.

**Highlights:** Multiplication puzzle solving, Quick daily brain training, Simple tap controls, Suitable for all ages, Short play sessions

**Features:** macOS Compatibility

**In-app purchases:** none


### Subtraction App

[App page](https://appshunter.io/ios/app/subtraction-app/id1622934481)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | per month |


## Frequently asked questions

### Is Crush9×9 free?

Crush9×9 is free to download, with no in-app purchases.

### Is Subtraction App free?

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

### Do Crush9×9 or Subtraction App have ads?

Both Crush9×9 and Subtraction App show ads.

### Which is updated more often, Crush9×9 or Subtraction App?

Crush9×9 ships an update every 6 weeks, and Subtraction App every 2 weeks. Most recently, Crush9×9 was updated on October 4, 2026 and Subtraction App on October 11, 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.*