# PDMreader vs 掌证通

The clearest difference is price: 掌证通 at Free against PDMreader's $1.99. 掌证通 also leads on update cadence (every 19 months vs every 39 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

掌证通 is free to download; PDMreader costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PDMreader ships an update every 39 months, 掌证通 every 19 months. The most recent releases landed on October 3, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | PDMreader | 掌证通 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 19 months** |
| Size | 1 MB | 28 MB |
| Requires iOS | 13.1 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [鹏 王](https://appshunter.io/developer/1503881516) | [Shanghai Electronic Certificate Authority Center Co.,LTD](https://appshunter.io/developer/924307388) |

## What reviewers say

### PDMreader

[App page](https://appshunter.io/ios/app/pdmreader/id1503897575)

**Features:** macOS Compatibility

**In-app purchases:** none


### 掌证通

[App page](https://appshunter.io/ios/app/id6450326978)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PDMreader free?

PDMreader costs $1.99, with no in-app purchases.

### Is 掌证通 free?

掌证通 is free to download, with no in-app purchases.

### Do PDMreader or 掌证通 have ads?

Neither PDMreader nor 掌证通 shows ads.

### Which is updated more often, PDMreader or 掌证通?

PDMreader ships an update every 39 months, and 掌证通 every 19 months. Most recently, PDMreader was updated on October 3, 2026 and 掌证通 on September 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.*