# Mars Book vs Zahyo78

The clearest difference is iOS requirement: Mars Book at 9.0 against Zahyo78's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Mars Book ships an update every 13 months, Zahyo78 every 22 months. The most recent releases landed on November 11, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Mars Book | Zahyo78 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 13 months** | Every 22 months |
| Size | 14 MB | 52 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [Hiroyuki Nakano](https://appshunter.io/developer/1091174971) |

## What reviewers say

### Mars Book

[App page](https://appshunter.io/ios/app/mars-book/id1342509724)

**In-app purchases:** none


### Zahyo78

[App page](https://appshunter.io/ios/app/zahyo78/id6482049736)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mars Book free?

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

### Is Zahyo78 free?

Zahyo78 is free to download, with no in-app purchases.

### Do Mars Book or Zahyo78 have ads?

Neither Mars Book nor Zahyo78 shows ads.

### Which is updated more often, Mars Book or Zahyo78?

Mars Book ships an update every 13 months, and Zahyo78 every 22 months. Most recently, Mars Book was updated on November 11, 2026 and Zahyo78 on November 4, 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.*