# PDMreader vs 中科水族

The clearest difference is price: 中科水族 at Free against PDMreader's $1.99. 中科水族 also leads on update cadence (every 3 weeks vs every 39 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

中科水族 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, 中科水族 every 3 weeks. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | PDMreader | 中科水族 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 3 weeks** |
| Size | 1 MB | 102 MB |
| Requires iOS | 13.1 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [鹏 王](https://appshunter.io/developer/1503881516) | [世纪中科科技](https://appshunter.io/developer/1495130398) |

## What reviewers say

### PDMreader

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

**Features:** macOS Compatibility

**In-app purchases:** none


### 中科水族

[App page](https://appshunter.io/ios/app/id1561319515)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDMreader free?

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

### Is 中科水族 free?

中科水族 is free to download, with no in-app purchases.

### Do PDMreader or 中科水族 have ads?

Neither PDMreader nor 中科水族 shows ads.

### Which is updated more often, PDMreader or 中科水族?

PDMreader ships an update every 39 months, and 中科水族 every 3 weeks. Most recently, PDMreader was updated on October 3, 2026 and 中科水族 on October 7, 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.*