# i 开大 vs 数字郑工

The clearest difference is update cadence: 数字郑工 at every 5 weeks against i 开大's every 3 months. 数字郑工 also leads on iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

i 开大 ships an update every 3 months, 数字郑工 every 5 weeks. The most recent releases landed on September 8, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | i 开大 | 数字郑工 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 10.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Size | 23 MB | 91 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Kaifeng University](https://appshunter.io/developer/1486289863) | [郑州工业应用技术学院](https://appshunter.io/developer/1652631422) |

## What reviewers say

### i 开大

[App page](https://appshunter.io/ios/app/i/id1477281717)

**Features:** macOS Compatibility

**In-app purchases:** none


### 数字郑工

[App page](https://appshunter.io/ios/app/id6444147178)

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

**In-app purchases:** none


## Frequently asked questions

### Is i 开大 free?

i 开大 is free to download, with no in-app purchases.

### Is 数字郑工 free?

数字郑工 is free to download, with no in-app purchases.

### Do i 开大 or 数字郑工 have ads?

Neither i 开大 nor 数字郑工 shows ads.

### Which is updated more often, i 开大 or 数字郑工?

i 开大 ships an update every 3 months, and 数字郑工 every 5 weeks. Most recently, i 开大 was updated on September 8, 2026 and 数字郑工 on September 13, 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.*