# ADI BOOK vs DIFY

ADI BOOK and DIFY are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

ADI BOOK ships an update every 6 weeks, DIFY every 2 months. The most recent releases landed on October 25, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | ADI BOOK | DIFY |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Size | 35 MB | 63 MB |
| Requires iOS | **13.0** | 14.0.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [ADI BOOK LIMITED](https://appshunter.io/developer/1801016102) | [Y4 CSTM](https://appshunter.io/developer/1876361136) |

## What reviewers say

### ADI BOOK

[App page](https://appshunter.io/ios/app/adi-book-student/id6743047444)

**Features:** macOS Compatibility

**In-app purchases:** none


### DIFY

[App page](https://appshunter.io/ios/app/dify-driving-instructor/id6759010961)

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

**In-app purchases:** none


## Frequently asked questions

### Is ADI BOOK free?

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

### Is DIFY free?

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

### Do ADI BOOK or DIFY have ads?

Neither ADI BOOK nor DIFY shows ads.

### Which is updated more often, ADI BOOK or DIFY?

ADI BOOK ships an update every 6 weeks, and DIFY every 2 months. Most recently, ADI BOOK was updated on October 25, 2026 and DIFY on October 3, 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.*