# System Design Refresher vs AZ

The clearest difference is in-app purchases: System Design Refresher at none against AZ's 1. AZ's advantage is update cadence (every 5 days vs monthly) and iOS requirement (15.1 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. AZ sells 1 one-off in-app purchase. System Design Refresher asks for nothing beyond the download.

System Design Refresher ships an update monthly, AZ every 5 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | System Design Refresher | AZ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Size | 18 MB | 160 MB |
| Requires iOS | 26.2 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Saurabh Sharma](https://appshunter.io/developer/1883599017) | [CHOI SEONGMIN](https://appshunter.io/developer/6772332527) |

## 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


### AZ

[App page](https://appshunter.io/ios/app/az-700-networking-exam-prep/id6782107767)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AZ-700 Lifetime Access | $4.99 | one-time |


## Frequently asked questions

### Is System Design Refresher free?

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

### Is AZ free?

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

### Do System Design Refresher or AZ have ads?

Neither System Design Refresher nor AZ shows ads.

### Which is updated more often, System Design Refresher or AZ?

System Design Refresher ships an update monthly, and AZ every 5 days. Most recently, System Design Refresher was updated on October 25, 2026 and AZ on October 24, 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.*