# Chapters vs ShelfMark

The clearest difference is in-app purchases: Chapters at none against ShelfMark's 1. ShelfMark's advantage is update cadence (weekly vs every 4 weeks) and iOS requirement (18.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. ShelfMark sells 1 one-off in-app purchase. Chapters asks for nothing beyond the download.

Chapters ships an update every 4 weeks, ShelfMark weekly. Both last shipped on October 25, 2026.

## The numbers

| Metric | Chapters | ShelfMark |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Weekly** |
| Size | 6 MB | 6 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Mobile Appster](https://appshunter.io/developer/1063664800) | [InnovaLabWorks](https://appshunter.io/developer/1888514726) |

## What reviewers say

### Chapters

[App page](https://appshunter.io/ios/app/chapters-audiobook-player/id6762648191)

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

**In-app purchases:** none


### ShelfMark

[App page](https://appshunter.io/ios/app/shelfmark-reading-tracker/id6788129809)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ShelfMark Lifetime | $12.99 | one-time |


## Frequently asked questions

### Is Chapters free?

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

### Is ShelfMark free?

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

### Do Chapters or ShelfMark have ads?

Neither Chapters nor ShelfMark shows ads.

### Which is updated more often, Chapters or ShelfMark?

Chapters ships an update every 4 weeks, and ShelfMark weekly. Most recently, Chapters was updated on October 25, 2026 and ShelfMark on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*