# Rainy AI vs AB

The clearest difference is in-app purchases: Rainy AI at none against AB's 3. Rainy AI also leads on ads (none vs shown) and update cadence (every 5 days vs every 3 weeks). AB's advantage is iOS requirement (15.1 vs 17.6). On price and device support there is nothing between them.

Both are free to download. AB sells 3 one-off in-app purchases. Rainy AI asks for nothing beyond the download.

Rainy AI ships an update every 5 days, AB every 3 weeks. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Rainy AI | AB |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Size | 846 MB | 41 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Chao Yi Chen](https://appshunter.io/developer/1809452800) | [Thomas Baric](https://appshunter.io/developer/1872894014) |

## What reviewers say

### Rainy AI

[App page](https://appshunter.io/ios/app/rainy-ai/id6753078426)

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

**In-app purchases:** none


### AB

[App page](https://appshunter.io/ios/app/ab-731-practice-test/id6761743560)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AB-731 Pro | $2.99 | one-time |
| AB-731 Pro | $4.99 | one-time |
| Microsoft Business AI Bundle | $6.99 | one-time |


## Frequently asked questions

### Is Rainy AI free?

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

### Is AB free?

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

### Do Rainy AI or AB have ads?

AB shows ads; Rainy AI does not.

### Which is updated more often, Rainy AI or AB?

Rainy AI ships an update every 5 days, and AB every 3 weeks. Most recently, Rainy AI was updated on October 14, 2026 and AB on October 16, 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.*