# Mean vs Standard Deviation

The clearest difference is price: Standard Deviation at Free against Mean's $1.99. Standard Deviation also leads on update cadence (every 2 months vs every 56 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Standard Deviation is free to download; Mean costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Mean ships an update every 56 months, Standard Deviation every 2 months. The most recent releases landed on September 3, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Mean | Standard Deviation |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 56 months | **Every 2 months** |
| Size | 1 MB | 21 MB |
| Requires iOS | **12.2** | 13.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Ajay Gorasiya](https://appshunter.io/developer/1455174866) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### Mean

[App page](https://appshunter.io/ios/app/mean-statistics-calculators/id1483009718)

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

**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 Mean free?

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

### Is Standard Deviation free?

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

### Do Mean or Standard Deviation have ads?

Neither Mean nor Standard Deviation shows ads.

### Which is updated more often, Mean or Standard Deviation?

Mean ships an update every 56 months, and Standard Deviation every 2 months. Most recently, Mean was updated on September 3, 2026 and Standard Deviation on September 12, 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.*