# Mars Book vs Astris

The clearest difference is update cadence: Astris at every 3 months against Mars Book's every 13 months. Mars Book's advantage is iOS requirement (9.0 vs 15.0). 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, Astris every 3 months. The most recent releases landed on September 10, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Mars Book | Astris |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 months** |
| Size | 14 MB | 21 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [ISTITUTI EDMONDO DE AMICIS SRL](https://appshunter.io/developer/1219261025) |

## What reviewers say

### Mars Book

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

**In-app purchases:** none


### Astris

[App page](https://appshunter.io/ios/app/astris/id6454899891)

**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 Astris free?

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

### Do Mars Book or Astris have ads?

Neither Mars Book nor Astris shows ads.

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

Mars Book ships an update every 13 months, and Astris every 3 months. Most recently, Mars Book was updated on September 10, 2026 and Astris on May 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.*