# Quick Correlation Coefficients vs Calculate Standard Deviation

The clearest difference is review sentiment: Calculate Standard Deviation at 50% against Quick Correlation Coefficients's 0%. Calculate Standard Deviation also leads on rating (4.5 vs 1.0) and ratings volume (62 vs 1). Quick Correlation Coefficients's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Calculate Standard Deviation sells 1 one-off in-app purchase. Quick Correlation Coefficients asks for nothing beyond the download.

Calculate Standard Deviation holds the better App Store score, 4.5 against 1.0. That said, the two scores are not equally well evidenced: Calculate Standard Deviation has 62 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Quick Correlation Coefficients's written reviews are positive against 50% of Calculate Standard Deviation's.

Quick Correlation Coefficients ships an update every 4 months, Calculate Standard Deviation every 7 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Quick Correlation Coefficients | Calculate Standard Deviation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/quick-correlation-coefficients/id478355922/reviews) | **[4.5 (62 ratings)](https://appshunter.io/ios/app/calculate-standard-deviation/id1591420646/reviews)** |
| Number of ratings | 1 | **62** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 39 MB |
| Requires iOS | **12.3** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [MSYapps](https://appshunter.io/developer/458482419) | [Asad Ahsan](https://appshunter.io/developer/1326954499) |

## What reviewers say

### Quick Correlation Coefficients

[App page](https://appshunter.io/ios/app/quick-correlation-coefficients/id478355922)

This app calculates the correlation coefficient between two or three sets of numerical data. It offers flexible data entry methods, including a slider and keypad, and handles missing values to compute relationships accurately.

**Highlights:** Calculate correlation coefficient (rho), Relate two or three data sets, Slider data entry, Keypad data entry, Handles missing data (n/a), Minimum 3 data pairs required

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Quick Correlation Coefficients free?

Quick Correlation Coefficients is free to download, with no in-app purchases.

### Is Calculate Standard Deviation free?

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

### Which has better reviews, Quick Correlation Coefficients or Calculate Standard Deviation?

Calculate Standard Deviation is rated higher. Quick Correlation Coefficients averages 1.0 out of 5 from 1 ratings, while Calculate Standard Deviation averages 4.5 from 62 ratings.

### Do Quick Correlation Coefficients or Calculate Standard Deviation have ads?

Calculate Standard Deviation shows ads; Quick Correlation Coefficients does not.

### Which is updated more often, Quick Correlation Coefficients or Calculate Standard Deviation?

Quick Correlation Coefficients ships an update every 4 months, and Calculate Standard Deviation every 7 months. Most recently, Quick Correlation Coefficients was updated on November 6, 2026 and Calculate Standard Deviation on November 3, 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.*