# AZ vs AI

The clearest difference is ads: AZ at none against AI's shown. AZ also leads on iOS requirement (13.0 vs 15.6). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. AZ sells 1 one-off in-app purchase and AI sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

AZ ships an update every 6 weeks, AI every 3 weeks. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | AZ | AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Size | 14 MB | 154 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Curiosity Ventures LLC](https://appshunter.io/developer/981375796) | [合同会社HopStep](https://appshunter.io/developer/1749721044) |

## What reviewers say

### AZ

[App page](https://appshunter.io/ios/app/az-900/id1636391701)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全ての質問 | $3.99 | one-time |


### AI

[App page](https://appshunter.io/ios/app/ai-901-study-and-practice/id6759863242)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Complete Pack - Sale | $5.99 | one-time |
| Complete Pack | $9.99 | one-time |
| Lifetime Premium | $11.99 | one-time |


## Frequently asked questions

### Is AZ free?

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

### Is AI free?

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

### Do AZ or AI have ads?

AI shows ads; AZ does not.

### Which is updated more often, AZ or AI?

AZ ships an update every 6 weeks, and AI every 3 weeks. Most recently, AZ was updated on November 3, 2026 and AI on November 5, 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.*