# PDF转换器 vs 简证

The clearest difference is device support: PDF转换器 at 3 against 简证's 1. PDF转换器 also leads on iOS requirement (12.0 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. PDF转换器 sells 3 in-app purchases, starting at $3.99 per month and 简证 sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

PDF转换器 ships an update every 2 months, 简证 every 3 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | PDF转换器 | 简证 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 9 MB | 117 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jiujiu Service Co., Ltd.](https://appshunter.io/developer/1664391586) | [先全 顾](https://appshunter.io/developer/1706065914) |

## What reviewers say

### PDF转换器

[App page](https://appshunter.io/ios/app/pdf-pdf/id1669152511)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月会员 | $3.99 | per month |
| 年会员 | $12.99 | per year |
| 永久会员 | $14.99 | one-time |


### 简证

[App page](https://appshunter.io/ios/app/id6502866826)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周会员 | $2.99 | per 7 days |
| 终生会员 | $5.99 | one-time |


## Frequently asked questions

### Is PDF转换器 free?

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

### Is 简证 free?

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

### Do PDF转换器 or 简证 have ads?

Neither PDF转换器 nor 简证 shows ads.

### Which is updated more often, PDF转换器 or 简证?

PDF转换器 ships an update every 2 months, and 简证 every 3 months. Most recently, PDF转换器 was updated on November 3, 2026 and 简证 on October 30, 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.*