# expt vs ShelfMark

The clearest difference is in-app purchases: expt at none against ShelfMark's 1. expt also leads on iOS requirement (15.1 vs 18.0). On price, ads and device support there is nothing between them.

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

## The numbers

| Metric | expt | ShelfMark |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 45 MB | 6 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Arthur Park](https://appshunter.io/developer/1448983841) | [InnovaLabWorks](https://appshunter.io/developer/1888514726) |

## What reviewers say

### expt

[App page](https://appshunter.io/ios/app/expt-file-reader/id6760808933)

**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 expt free?

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

### Is ShelfMark free?

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

### Do expt or ShelfMark have ads?

Neither expt nor ShelfMark shows ads.

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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.*