# Scan King vs BioSync

Scan King and BioSync are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scan King ships an update every 4 days, BioSync every 3 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Scan King | BioSync |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 15 MB | 53 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Tenghai Information Technology Co., LTD](https://appshunter.io/developer/1889364628) | [Zebra B Ltd](https://appshunter.io/developer/1637889369) |

## What reviewers say

### Scan King

[App page](https://appshunter.io/ios/app/scan-king-ocrscanner-and-pdfeditor/id6761813494)

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

**In-app purchases:** none


### BioSync

[App page](https://appshunter.io/ios/app/biosync-biogen/id6772211767)

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

**In-app purchases:** none


## Frequently asked questions

### Is Scan King free?

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

### Is BioSync free?

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

### Do Scan King or BioSync have ads?

Neither Scan King nor BioSync shows ads.

### Which is updated more often, Scan King or BioSync?

Scan King ships an update every 4 days, and BioSync every 3 days. Most recently, Scan King was updated on October 31, 2026 and BioSync on October 31, 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.*