# zhihui connect vs Standard Deviation

The clearest difference is device support: Standard Deviation at 4 against zhihui connect's —. zhihui connect's advantage is iOS requirement (9.0 vs 13.0). On price and in-app purchases there is nothing between them.

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

## The numbers

| Metric | zhihui connect | Standard Deviation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/standard-deviation-calculator/id6444146244/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | — | Every 2 months |
| Size | 217 MB | 21 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | — | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [章贵 谢](https://appshunter.io/developer/1502663799) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### zhihui connect

[App page](https://appshunter.io/ios/app/zhihui-connect/id1520171424)

**In-app purchases:** none


### Standard Deviation

[App page](https://appshunter.io/ios/app/standard-deviation-calculator/id6444146244)

**In-app purchases:** none


## Frequently asked questions

### Is zhihui connect free?

zhihui connect is free to download, with no in-app purchases.

### Is Standard Deviation free?

Standard Deviation is free to download, with no in-app purchases.

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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.*