# Adopt a Book vs Shelf Scanner.

The clearest difference is in-app purchases: Adopt a Book at none against Shelf Scanner.'s 3. Adopt a Book also leads on update cadence (every 2 weeks vs every 7 months) and iOS requirement (15.5 vs 17.6). Shelf Scanner.'s advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Shelf Scanner. sells 3 in-app purchases, starting at $4.99 per 7 days. Adopt a Book asks for nothing beyond the download.

Adopt a Book ships an update every 2 weeks, Shelf Scanner. every 7 months. The most recent releases landed on October 25, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Adopt a Book | Shelf Scanner. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (263 ratings)](https://appshunter.io/ios/app/shelf-scanner/id6503261472/reviews)** |
| Number of ratings | — | **263** |
| Positive reviews | — | 9.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 7 months |
| Monetization | — | Free with in-app purchases |
| Size | 101 MB | 45 MB |
| Requires iOS | **15.5** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Praneeth Peiris](https://appshunter.io/developer/1638142024) | [Gabe Rogers](https://appshunter.io/developer/1584630702) |

## What reviewers say

### Adopt a Book

[App page](https://appshunter.io/ios/app/adopt-a-book/id1638142022)

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

**In-app purchases:** none


### Shelf Scanner.

[App page](https://appshunter.io/ios/app/shelf-scanner/id6503261472)

Easily discover the value of books by scanning barcodes or taking photos of entire shelves. Get live pricing data from major online sellers to maximize your profit when selling your books.

**Highlights:** Scan book barcodes for value, Photo scan entire bookshelves, Live pricing data, Sell books for profit, Source from major online sellers

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $4.99 | per 7 days |
| Monthly Pro | $15.99 | per month |
| Annual Pro | $48.99 | per year |


## Frequently asked questions

### Is Adopt a Book free?

Adopt a Book is free to download, with no in-app purchases.

### Is Shelf Scanner. free?

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

### Do Adopt a Book or Shelf Scanner. have ads?

Adopt a Book shows ads; Shelf Scanner. does not.

### Which is updated more often, Adopt a Book or Shelf Scanner.?

Adopt a Book ships an update every 2 weeks, and Shelf Scanner. every 7 months. Most recently, Adopt a Book was updated on October 25, 2026 and Shelf Scanner. on October 21, 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.*