# Book Diary vs Marcus

The clearest difference is update cadence: Book Diary at every 2 days against Marcus's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Book Diary sells 1 in-app purchase, starting at $3.99 per month and Marcus sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

Book Diary ships an update every 2 days, Marcus every 2 months. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Book Diary | Marcus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 2 months |
| Size | 2 MB | 65 MB |
| Requires iOS | 17.6 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [VADZIM TSITKO](https://appshunter.io/developer/1713712145) | [Vukasin Rancic](https://appshunter.io/developer/1886442082) |

## What reviewers say

### Book Diary

[App page](https://appshunter.io/ios/app/book-diary/id6757989246)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $3.99 | per month |


### Marcus

[App page](https://appshunter.io/ios/app/marcus-book-and-reading-tracker/id6792703147)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Marcus Pro Monthly | $6.99 | per month |
| Marcus Pro Annual | $49.99 | per year |


## Frequently asked questions

### Is Book Diary free?

Book Diary is free to download, with in-app purchases available.

### Is Marcus free?

Marcus is free to download, with in-app purchases available.

### Do Book Diary or Marcus have ads?

Neither Book Diary nor Marcus shows ads.

### Which is updated more often, Book Diary or Marcus?

Book Diary ships an update every 2 days, and Marcus every 2 months. Most recently, Book Diary was updated on October 16, 2026 and Marcus on October 9, 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.*