# PDF Guard(Pro) vs CK Wear OS

The clearest difference is price: CK Wear OS at Free against PDF Guard(Pro)'s $2.99. CK Wear OS also leads on update cadence (every 10 days vs every 20 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

CK Wear OS is free to download; PDF Guard(Pro) costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PDF Guard(Pro) ships an update every 20 months, CK Wear OS every 10 days. The most recent releases landed on October 9, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | PDF Guard(Pro) | CK Wear OS |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 10 days** |
| Size | 22 MB | 188 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Hrishi Suthar](https://appshunter.io/developer/1660005858) | [Shenzhen Aienmi Technology Co., Ltd.](https://appshunter.io/developer/1761782444) |

## What reviewers say

### PDF Guard(Pro)

[App page](https://appshunter.io/ios/app/pdf-guardpro/id6475249016)

**Features:** macOS Compatibility

**In-app purchases:** none


### CK Wear OS

[App page](https://appshunter.io/ios/app/ck-wear-os/id6618142425)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PDF Guard(Pro) free?

PDF Guard(Pro) costs $2.99, with no in-app purchases.

### Is CK Wear OS free?

CK Wear OS is free to download, with no in-app purchases.

### Do PDF Guard(Pro) or CK Wear OS have ads?

Neither PDF Guard(Pro) nor CK Wear OS shows ads.

### Which is updated more often, PDF Guard(Pro) or CK Wear OS?

PDF Guard(Pro) ships an update every 20 months, and CK Wear OS every 10 days. Most recently, PDF Guard(Pro) was updated on October 9, 2026 and CK Wear OS on October 15, 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.*