# 空白相册 vs PDF Converter

The clearest difference is update cadence: PDF Converter at every 3 weeks against 空白相册's every 18 months. PDF Converter also leads on device support and iOS requirement (14.0 vs 18.0). On price and in-app purchases there is nothing between them.

Both are free to download. 空白相册 sells 1 one-off in-app purchase and PDF Converter sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

空白相册 ships an update every 18 months, PDF Converter every 3 weeks. The most recent releases landed on October 17, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | 空白相册 | PDF Converter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | Every 18 months | **Every 3 weeks** |
| Size | 168 MB | 30 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | — | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [文智 祁](https://appshunter.io/developer/1675218675) | [XIAOYUN.TECH](https://appshunter.io/developer/1575836630) |

## What reviewers say

### 空白相册

[App page](https://appshunter.io/ios/app/id6450840156)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 空白相册高级版 | $3.99 | one-time |


### PDF Converter

[App page](https://appshunter.io/ios/app/pdf-converter-file-tools/id6752560738)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月订阅 | $2.99 | per month |
| 年会员 | $9.99 | one-time |


## Frequently asked questions

### Is 空白相册 free?

空白相册 is free to download, with in-app purchases available.

### Is PDF Converter free?

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

### Which is updated more often, 空白相册 or PDF Converter?

空白相册 ships an update every 18 months, and PDF Converter every 3 weeks. Most recently, 空白相册 was updated on October 17, 2026 and PDF Converter on October 21, 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.*