# Mars Book vs Mars

The clearest difference is ads: Mars Book at none against Mars's shown. Mars Book also leads on update cadence (every 13 months vs every 32 months) and iOS requirement (9.0 vs 17.0). On price, in-app purchases and device support 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, Mars every 32 months. The most recent releases landed on October 13, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Mars Book | Mars |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 13 months** | Every 32 months |
| Size | 14 MB | 108 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [Alparslan Topbas](https://appshunter.io/developer/1130875171) |

## What reviewers say

### Mars Book

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

**In-app purchases:** none


### Mars

[App page](https://appshunter.io/ios/app/mars-curiosity/id1549319225)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mars Book free?

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

### Is Mars free?

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

### Do Mars Book or Mars have ads?

Mars shows ads; Mars Book does not.

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

Mars Book ships an update every 13 months, and Mars every 32 months. Most recently, Mars Book was updated on October 13, 2026 and Mars 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.*