# Mars Book vs pt

The clearest difference is update cadence: pt at every 2 months against Mars Book's every 13 months. Mars Book's advantage is iOS requirement (9.0 vs 11.0). On price, ads, 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, pt every 2 months. The most recent releases landed on September 28, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Mars Book | pt |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 months** |
| Size | 14 MB | 1 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [Konstantin Brass](https://appshunter.io/developer/662876225) |

## What reviewers say

### Mars Book

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

**In-app purchases:** none


### pt

[App page](https://appshunter.io/ios/app/pt-wrapper/id1572128112)

**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 pt free?

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

### Do Mars Book or pt have ads?

Neither Mars Book nor pt shows ads.

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

Mars Book ships an update every 13 months, and pt every 2 months. Most recently, Mars Book was updated on September 28, 2026 and pt on October 2, 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.*