# Calculate Standard Deviation vs Z

The clearest difference is review sentiment: Z at 100% against Calculate Standard Deviation's 50%. Z also leads on rating (5.0 vs 4.5) and in-app purchases (none vs 1). Calculate Standard Deviation's advantage is price (Free vs $2.99) and ratings volume (62 vs 1). On ads and device support there is nothing between them.

Calculate Standard Deviation is free to download; Z costs $2.99 up front. Calculate Standard Deviation sells 1 one-off in-app purchase. Z asks for nothing beyond the download.

Z holds the better App Store score, 5.0 against 4.5. 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: 50% of Calculate Standard Deviation's written reviews are positive against 100% of Z's.

Calculate Standard Deviation ships an update every 7 months, Z every 6 weeks. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Calculate Standard Deviation | Z |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.5 (62 ratings)](https://appshunter.io/ios/app/calculate-standard-deviation/id1591420646/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/z-table-statistics/id6738610691/reviews)** |
| Number of ratings | **62** | 1 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 7 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 39 MB | 32 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Asad Ahsan](https://appshunter.io/developer/1326954499) | [JanoGroup LLC](https://appshunter.io/developer/1781461557) |

## 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 |


### Z

[App page](https://appshunter.io/ios/app/z-table-statistics/id6738610691)

This app provides a quick and easy way for students and professionals to look up Z-scores and calculate corresponding probabilities. It features comprehensive Z-score tables and a user-friendly interface for efficient statistical analysis.

**Highlights:** Comprehensive Z-score tables, Fast probability calculation, User-friendly interface, Educational tool for statistics, Reference for data analysis

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculate Standard Deviation free?

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

### Is Z free?

Z costs $2.99, with no in-app purchases.

### Which has better reviews, Calculate Standard Deviation or Z?

Z is rated higher. Calculate Standard Deviation averages 4.5 out of 5 from 62 ratings, while Z averages 5.0 from 1 ratings.

### Do Calculate Standard Deviation or Z have ads?

Both Calculate Standard Deviation and Z show ads.

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

Calculate Standard Deviation ships an update every 7 months, and Z every 6 weeks. Most recently, Calculate Standard Deviation was updated on October 3, 2026 and Z on October 9, 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.*