# PDF Conversion vs SereneDiary

The clearest difference is price: PDF Conversion at Free against SereneDiary's $0.99. SereneDiary's advantage is in-app purchases (none vs 4). On update cadence, ads, device support and iOS requirement there is nothing between them.

PDF Conversion is free to download; SereneDiary costs $0.99 up front. PDF Conversion sells 4 in-app purchases, starting at $2.99 per 7 days. SereneDiary asks for nothing beyond the download.

PDF Conversion ships an update every 3 weeks, SereneDiary every 6 weeks. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | PDF Conversion | SereneDiary |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Size | 5 MB | 1 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Litchi Fun Technology Co., Ltd.](https://appshunter.io/developer/1684888838) | [洪卫 潘](https://appshunter.io/developer/467365143) |

## What reviewers say

### PDF Conversion

[App page](https://appshunter.io/ios/app/pdf-conversion-convert-to-word/id6605929812)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $2.99 | per 7 days |
| Monthly Subscription | $4.99 | per month |
| Annual Subscription | $14.99 | per year |
| Lifetime Member | $24.99 | one-time |


### SereneDiary

[App page](https://appshunter.io/ios/app/serenediary/id6761915517)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDF Conversion free?

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

### Is SereneDiary free?

SereneDiary costs $0.99, with no in-app purchases.

### Do PDF Conversion or SereneDiary have ads?

Neither PDF Conversion nor SereneDiary shows ads.

### Which is updated more often, PDF Conversion or SereneDiary?

PDF Conversion ships an update every 3 weeks, and SereneDiary every 6 weeks. Most recently, PDF Conversion was updated on October 17, 2026 and SereneDiary on October 8, 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.*