# Calculate Standard Deviation vs Prime Math

The clearest difference is ads: Prime Math at none against Calculate Standard Deviation's shown. Prime Math also leads on update cadence (every 3 months vs every 7 months). Calculate Standard Deviation's advantage is iOS requirement (15.0 vs 18.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Calculate Standard Deviation sells 1 one-off in-app purchase and Prime Math sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Calculate Standard Deviation ships an update every 7 months, Prime Math every 3 months. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Calculate Standard Deviation | Prime Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (62 ratings)](https://appshunter.io/ios/app/calculate-standard-deviation/id1591420646/reviews)** | — |
| Number of ratings | **62** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free with in-app purchases | — |
| Size | 39 MB | 7 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Asad Ahsan](https://appshunter.io/developer/1326954499) | [Oluwatobi Omotayo](https://appshunter.io/developer/1606453205) |

## What reviewers say

### Calculate Standard Deviation

[App page](https://appshunter.io/ios/app/calculate-standard-deviation/id1591420646)

This app calculates standard deviation, variance, and other statistical measures for a given set of values. It simplifies complex statistical formulas with a user-friendly interface and accurate results.

**Highlights:** Calculate Standard Deviation, Calculate Variance, Calculate Mean, Calculate Coefficient of Variance, Calculate Standard Error of Mean, User-friendly interface, Accurate statistical results

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard Deviation Premium | $4.99 | one-time |


### Prime Math

[App page](https://appshunter.io/ios/app/prime-math-ai-math-solver/id6746931470)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Monthly | $7.99 | per month |
| Yearly | $59.99 | per year |


## Frequently asked questions

### Is Calculate Standard Deviation free?

Calculate Standard Deviation is free to download, with in-app purchases available.

### Is Prime Math free?

Prime Math is free to download, with in-app purchases available.

### Do Calculate Standard Deviation or Prime Math have ads?

Calculate Standard Deviation shows ads; Prime Math does not.

### Which is updated more often, Calculate Standard Deviation or Prime Math?

Calculate Standard Deviation ships an update every 7 months, and Prime Math every 3 months. Most recently, Calculate Standard Deviation was updated on September 22, 2026 and Prime Math on September 21, 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.*