# BOOKSCAN Checker vs RetrieverX

The clearest difference is in-app purchases: BOOKSCAN Checker at none against RetrieverX's 3. BOOKSCAN Checker also leads on ads (none vs shown) and iOS requirement (15.0 vs 17.6). RetrieverX's advantage is update cadence (weekly vs every 4 months). On price and device support there is nothing between them.

Both are free to download. RetrieverX sells 3 in-app purchases, starting at $1.99 per month. BOOKSCAN Checker asks for nothing beyond the download.

BOOKSCAN Checker ships an update every 4 months, RetrieverX weekly. The most recent releases landed on October 23, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | BOOKSCAN Checker | RetrieverX |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Free | — |
| Size | 6 MB | 45 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [BOOKSCAN Inc.](https://appshunter.io/developer/441217651) | [Daichi Hayashi](https://appshunter.io/developer/1822604563) |

## What reviewers say

### BOOKSCAN Checker

[App page](https://appshunter.io/ios/app/bookscan-checker/id461348808)

Scan book ISBN barcodes with your iPhone or iPod Touch camera to retrieve book and publisher information. It's designed for books that are out of copyright, public domain, or for which you have obtained permission to use.

**Highlights:** Scan ISBN barcodes using device camera, Display book information, Display publisher information, Supports iPhone, iPad, and iPod Touch, Free to download and use

**In-app purchases:** none


### RetrieverX

[App page](https://appshunter.io/ios/app/retrieverx/id6747725272)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Monthly | $1.99 | per month |
| Standard Monthly | $3.99 | per month |
| Premium Monthly | $4.99 | per month |


## Frequently asked questions

### Is BOOKSCAN Checker free?

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

### Is RetrieverX free?

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

### Do BOOKSCAN Checker or RetrieverX have ads?

RetrieverX shows ads; BOOKSCAN Checker does not.

### Which is updated more often, BOOKSCAN Checker or RetrieverX?

BOOKSCAN Checker ships an update every 4 months, and RetrieverX weekly. Most recently, BOOKSCAN Checker was updated on October 23, 2026 and RetrieverX on October 10, 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.*