# 4Book (AI) vs Соловій

The clearest difference is in-app purchases: 4Book (AI) at none against Соловій's 1. Соловій's advantage is ads (none vs shown) and update cadence (every 2 days vs every 5 days). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Соловій sells 1 one-off in-app purchase. 4Book (AI) asks for nothing beyond the download.

4Book (AI) ships an update every 5 days, Соловій every 2 days. Both last shipped on October 29, 2026.

## The numbers

| Metric | 4Book (AI) | Соловій |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 days | **Every 2 days** |
| Size | 46 MB | 48 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ILLIA MAKAROV](https://appshunter.io/developer/6798360724) | [Hera Aliieva](https://appshunter.io/developer/6819348403) |

## What reviewers say

### 4Book (AI)

[App page](https://appshunter.io/ios/app/4book-ai/id6798360722)

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

**In-app purchases:** none


### Соловій

[App page](https://appshunter.io/ios/app/id6801910656)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Повний курс НМТ | $129.99 | one-time |


## Frequently asked questions

### Is 4Book (AI) free?

4Book (AI) is free to download, with no in-app purchases.

### Is Соловій free?

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

### Do 4Book (AI) or Соловій have ads?

4Book (AI) shows ads; Соловій does not.

### Which is updated more often, 4Book (AI) or Соловій?

4Book (AI) ships an update every 5 days, and Соловій every 2 days. Most recently, 4Book (AI) was updated on October 29, 2026 and Соловій on October 29, 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.*