# Arithmetic HD vs Cognify

The clearest difference is price: Cognify at Free against Arithmetic HD's $1.99. Arithmetic HD's advantage is in-app purchases (none vs 2) and iOS requirement (12.1 vs 17.0). On ads and device support there is nothing between them.

Cognify is free to download; Arithmetic HD costs $1.99 up front. Cognify sells 2 in-app purchases, starting at $6.99 per month. Arithmetic HD asks for nothing beyond the download.

## The numbers

| Metric | Arithmetic HD | Cognify |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | — |
| Size | 17 MB | 7 MB |
| Requires iOS | **12.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kostakov Maxim](https://appshunter.io/developer/524964352) | [Boris Spiro](https://appshunter.io/developer/1853293003) |

## What reviewers say

### Arithmetic HD

[App page](https://appshunter.io/ios/app/arithmetic-hd/id686967632)

**Features:** macOS Compatibility

**In-app purchases:** none


### Cognify

[App page](https://appshunter.io/ios/app/cognify-math-and-memory/id6782687535)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $6.99 | per month |
| Annual | $29.99 | per year |


## Frequently asked questions

### Is Arithmetic HD free?

Arithmetic HD costs $1.99, with no in-app purchases.

### Is Cognify free?

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

### Do Arithmetic HD or Cognify have ads?

Neither Arithmetic HD nor Cognify shows ads.

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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.*