# Mars Book vs Mars Today

The clearest difference is update cadence: Mars Today at monthly against Mars Book's every 13 months. Mars Book's advantage is iOS requirement (9.0 vs 15.2). 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, Mars Today monthly. The most recent releases landed on September 28, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Mars Book | Mars Today |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/mars-today/id1640335599/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Monthly** |
| Monetization | — | Free |
| Size | 14 MB | 4 MB |
| Requires iOS | **9.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [James Buckhouse](https://appshunter.io/developer/1631924321) |

## What reviewers say

### Mars Book

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

**In-app purchases:** none


### Mars Today

[App page](https://appshunter.io/ios/app/mars-today/id1640335599)

Access the latest images of Mars from NASA's Curiosity rover. Browse current photos or explore past images from Curiosity, Spirit, and Opportunity by SOL. Bookmark and share your favorite discoveries.

**Highlights:** Latest Mars images from Curiosity, View past images from Spirit and Opportunity, Browse by Mars SOL, Bookmark favorite images, Easy sharing functionality, No login required

**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 Mars Today free?

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

### Do Mars Book or Mars Today have ads?

Neither Mars Book nor Mars Today shows ads.

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

Mars Book ships an update every 13 months, and Mars Today monthly. Most recently, Mars Book was updated on September 28, 2026 and Mars Today on October 12, 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.*