# King Sejong Watch Keyboard vs PDF File Protector

The clearest difference is in-app purchases: King Sejong Watch Keyboard at none against PDF File Protector's 1. King Sejong Watch Keyboard also leads on update cadence (every 5 days vs every 2 months). PDF File Protector's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

King Sejong Watch Keyboard costs $19.99 and PDF File Protector $19.99 up front. PDF File Protector sells 1 one-off in-app purchase. King Sejong Watch Keyboard asks for nothing beyond the download.

King Sejong Watch Keyboard ships an update every 5 days, PDF File Protector every 2 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | King Sejong Watch Keyboard | PDF File Protector |
| --- | --- | --- |
| Price | $19.99 | $19.99 |
| Positive reviews | 54.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 5 days** | Every 2 months |
| Monetization | Paid | — |
| Size | 44 MB | 7 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TeraBaTek Co., Ltd](https://appshunter.io/developer/1625214140) | [乐祥 胡](https://appshunter.io/developer/1572365721) |

## What reviewers say

### King Sejong Watch Keyboard

[App page](https://appshunter.io/ios/app/king-sejong-watch-keyboard/id6449212059)

This app offers an intuitive Korean and English keyboard for Apple Watch, enabling quick and accurate typing with unique layouts and swipe gestures. Customize themes, pre-register frequently used texts, and switch between languages and symbols effortlessly.

**Highlights:** Intuitive Korean & English keyboard layout, Left/right swipe for language switching, Up/down swipe for numbers and symbols, Variety of color themes, Pre-registered frequently used texts, AI-enabled input experience

**Features:** Apple Watch app

**In-app purchases:** none


### PDF File Protector

[App page](https://appshunter.io/ios/app/pdf-file-protector/id6738285744)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| pdf签名内购 | $9.99 | one-time |


## Frequently asked questions

### Is King Sejong Watch Keyboard free?

King Sejong Watch Keyboard costs $19.99, with no in-app purchases.

### Is PDF File Protector free?

PDF File Protector costs $19.99, and also offers in-app purchases.

### Do King Sejong Watch Keyboard or PDF File Protector have ads?

King Sejong Watch Keyboard shows ads; PDF File Protector does not.

### Which is updated more often, King Sejong Watch Keyboard or PDF File Protector?

King Sejong Watch Keyboard ships an update every 5 days, and PDF File Protector every 2 months. Most recently, King Sejong Watch Keyboard was updated on November 3, 2026 and PDF File Protector on November 4, 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.*