# PDF Scanner vs K2Sonnet

The clearest difference is in-app purchases: K2Sonnet at none against PDF Scanner's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. PDF Scanner sells 2 in-app purchases, starting at $4.00 per 7 days. K2Sonnet asks for nothing beyond the download.

PDF Scanner ships an update every 4 months, K2Sonnet every 7 months. The most recent releases landed on September 17, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | PDF Scanner | K2Sonnet |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 7 months |
| Size | 14 MB | 2 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Kelvin Kioko](https://appshunter.io/developer/1757816326) | [Shanghai Jiyue Information Technology Co., Ltd.](https://appshunter.io/developer/1795192424) |

## What reviewers say

### PDF Scanner

[App page](https://appshunter.io/ios/app/pdf-scanner-editor-and-reader/id6651829949)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.00 | per 7 days |
| Monthly | $7.99 | per month |


### K2Sonnet

[App page](https://appshunter.io/ios/app/k2sonnet/id6753734747)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PDF Scanner free?

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

### Is K2Sonnet free?

K2Sonnet is free to download, with no in-app purchases.

### Do PDF Scanner or K2Sonnet have ads?

Neither PDF Scanner nor K2Sonnet shows ads.

### Which is updated more often, PDF Scanner or K2Sonnet?

PDF Scanner ships an update every 4 months, and K2Sonnet every 7 months. Most recently, PDF Scanner was updated on September 17, 2026 and K2Sonnet on October 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*