# SeaKey vs Shelf Scanner.

The clearest difference is rating: SeaKey at 5.0 against Shelf Scanner.'s 4.5. SeaKey also leads on in-app purchases (none vs 3) and device support (3 vs 1). Shelf Scanner.'s advantage is ratings volume (252 vs 1). On price, update cadence and ads there is nothing between them.

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

SeaKey holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Shelf Scanner. has 252 ratings behind it against 1, so its average is the more settled of the two.

SeaKey ships an update every 8 months, Shelf Scanner. every 7 months. The most recent releases landed on September 29, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | SeaKey | Shelf Scanner. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/seakey/id6448617545/reviews)** | [4.5 (252 ratings)](https://appshunter.io/ios/app/shelf-scanner/id6503261472/reviews) |
| Number of ratings | 1 | **252** |
| Positive reviews | — | 9.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 7 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 87 MB | 45 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Code for Nature](https://appshunter.io/developer/1829374322) | [Gabe Rogers](https://appshunter.io/developer/1584630702) |

## What reviewers say

### SeaKey

[App page](https://appshunter.io/ios/app/seakey/id6448617545)

This toolbox helps identify seaweeds found in the German North Sea. It features an interactive key for species identification and detailed taxon profiles for verification. A glossary is also included to explain scientific terms.

**Highlights:** Interactive Identification Key, Species identification, Taxon Profiles, Glossary of scientific terms, German North Sea focus

**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 SeaKey free?

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

### Is Shelf Scanner. free?

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

### Which has better reviews, SeaKey or Shelf Scanner.?

SeaKey is rated higher. SeaKey averages 5.0 out of 5 from 1 ratings, while Shelf Scanner. averages 4.5 from 252 ratings.

### Do SeaKey or Shelf Scanner. have ads?

Neither SeaKey nor Shelf Scanner. shows ads.

### Which is updated more often, SeaKey or Shelf Scanner.?

SeaKey ships an update every 8 months, and Shelf Scanner. every 7 months. Most recently, SeaKey was updated on September 29, 2026 and Shelf Scanner. on October 13, 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.*