# Happier PDF vs China Key

The clearest difference is in-app purchases: China Key at none against Happier PDF's 1. China Key also leads on iOS requirement (13.0 vs 16.0). Happier PDF's advantage is update cadence (every 3 days vs every 11 months). On price, ads and device support there is nothing between them.

Both are free to download. Happier PDF sells 1 one-off in-app purchase. China Key asks for nothing beyond the download.

Happier PDF ships an update every 3 days, China Key every 11 months. The most recent releases landed on October 27, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Happier PDF | China Key |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 11 months |
| Size | 2 MB | 28 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | +17 |
| Developer | [Thi Hong Chau Le](https://appshunter.io/developer/1610084014) | [MEGABEE SAL](https://appshunter.io/developer/1609910651) |

## What reviewers say

### Happier PDF

[App page](https://appshunter.io/ios/app/happier-pdf/id6470315442)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Export PDF without limitation | $1.99 | one-time |


### China Key

[App page](https://appshunter.io/ios/app/china-key/id6737232804)

**In-app purchases:** none


## Frequently asked questions

### Is Happier PDF free?

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

### Is China Key free?

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

### Do Happier PDF or China Key have ads?

Neither Happier PDF nor China Key shows ads.

### Which is updated more often, Happier PDF or China Key?

Happier PDF ships an update every 3 days, and China Key every 11 months. Most recently, Happier PDF was updated on October 27, 2026 and China Key on October 9, 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.*