# System Design Refresher vs Al

The clearest difference is device support: System Design Refresher at 2 against Al's —. Al's advantage is iOS requirement (13.0 vs 26.2). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | System Design Refresher | Al |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Monthly | — |
| Size | 18 MB | 36 MB |
| Requires iOS | 26.2 | **13.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [Saurabh Sharma](https://appshunter.io/developer/1883599017) | [hicham ibn-alkadi](https://appshunter.io/developer/1838780231) |

## What reviewers say

### System Design Refresher

[App page](https://appshunter.io/ios/app/system-design-refresher/id6760277935)

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

**In-app purchases:** none


### Al

[App page](https://appshunter.io/ios/app/al-jabr-competition-math/id6760369688)

**In-app purchases:** none


## Frequently asked questions

### Is System Design Refresher free?

System Design Refresher is free to download, with no in-app purchases.

### Is Al free?

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

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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.*