# Book Tracker vs Underlined

The clearest difference is update cadence: Underlined at fortnightly against Book Tracker's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Book Tracker sells 2 in-app purchases, starting at $4.99 per 7 days and Underlined sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Book Tracker ships an update monthly, Underlined fortnightly. Both last shipped on October 25, 2026.

## The numbers

| Metric | Book Tracker | Underlined |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Size | 17 MB | 24 MB |
| Requires iOS | 18.2 | **18.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Smart Automation SRL](https://appshunter.io/developer/1822502270) | [Mert Arman](https://appshunter.io/developer/6795348333) |

## What reviewers say

### Book Tracker

[App page](https://appshunter.io/ios/app/book-tracker-readcue/id6776339577)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReadCue Premium Weekly | $4.99 | per 7 days |
| ReadCue Premium Yearly | $29.99 | per year |


### Underlined

[App page](https://appshunter.io/ios/app/underlined-bookshelf-tracker/id6805132642)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Underlined - Monthly | $2.99 | per month |
| Underlined - Yearly | $19.99 | per year |


## Frequently asked questions

### Is Book Tracker free?

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

### Is Underlined free?

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

### Do Book Tracker or Underlined have ads?

Neither Book Tracker nor Underlined shows ads.

### Which is updated more often, Book Tracker or Underlined?

Book Tracker ships an update monthly, and Underlined fortnightly. Most recently, Book Tracker was updated on October 25, 2026 and Underlined on October 25, 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.*