# 试管百科 vs PDF转换器

The clearest difference is in-app purchases: 试管百科 at none against PDF转换器's 3. PDF转换器's advantage is iOS requirement (11.0 vs 13.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. PDF转换器 sells 3 in-app purchases, starting at $3.99 per 7 days. 试管百科 asks for nothing beyond the download.

试管百科 ships an update every 3 weeks, PDF转换器 every 2 weeks. Both last shipped on October 27, 2026.

## The numbers

| Metric | 试管百科 | PDF转换器 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 44 MB | 34 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Chengdu Mantang Tianxia Network Technology Co., Ltd.](https://appshunter.io/developer/1576061027) | [鑫鑫 陈](https://appshunter.io/developer/1647351343) |

## What reviewers say

### 试管百科

[App page](https://appshunter.io/ios/app/id1641664209)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF转换器

[App page](https://appshunter.io/ios/app/pdf/id1659370888)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| pdf转换器周订阅 | $3.99 | per 7 days |
| pdf转换器月订阅 | $12.99 | per month |
| pdf转换器季度订阅 | $19.99 | per 3 months |


## Frequently asked questions

### Is 试管百科 free?

试管百科 is free to download, with no in-app purchases.

### Is PDF转换器 free?

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

### Do 试管百科 or PDF转换器 have ads?

Neither 试管百科 nor PDF转换器 shows ads.

### Which is updated more often, 试管百科 or PDF转换器?

试管百科 ships an update every 3 weeks, and PDF转换器 every 2 weeks. Most recently, 试管百科 was updated on October 27, 2026 and PDF转换器 on October 27, 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.*