# Double Digits vs 19×19

The clearest difference is price: Double Digits at Free against 19×19's $2.99. Double Digits also leads on iOS requirement (15.1 vs 18.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Double Digits is free to download; 19×19 costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Double Digits ships an update weekly, 19×19 every 9 days. Both last shipped on October 29, 2026.

## The numbers

| Metric | Double Digits | 19×19 |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 9 days |
| Size | 28 MB | 7 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [shota shimogama](https://appshunter.io/developer/6796290145) | [JINGZHE JIANG](https://appshunter.io/developer/1888097689) |

## What reviewers say

### Double Digits

[App page](https://appshunter.io/ios/app/double-digits-mental-math/id6796290143)

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

**In-app purchases:** none


### 19×19

[App page](https://appshunter.io/ios/app/1919/id6815097266)

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

**In-app purchases:** none


## Frequently asked questions

### Is Double Digits free?

Double Digits is free to download, with no in-app purchases.

### Is 19×19 free?

19×19 costs $2.99, with no in-app purchases.

### Do Double Digits or 19×19 have ads?

Neither Double Digits nor 19×19 shows ads.

### Which is updated more often, Double Digits or 19×19?

Double Digits ships an update weekly, and 19×19 every 9 days. Most recently, Double Digits was updated on October 29, 2026 and 19×19 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.*