# STA Methods vs Calculate Standard Deviation

The clearest difference is rating: STA Methods at 5.0 against Calculate Standard Deviation's 4.5. STA Methods also leads on in-app purchases (none vs 1) and ads (none vs shown). Calculate Standard Deviation's advantage is ratings volume (62 vs 1). 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. STA Methods asks for nothing beyond the download.

STA Methods 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.

STA Methods ships an update every 4 months, Calculate Standard Deviation every 7 months. The most recent releases landed on October 2, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | STA Methods | Calculate Standard Deviation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sta-methods/id657466046/reviews)** | [4.5 (62 ratings)](https://appshunter.io/ios/app/calculate-standard-deviation/id1591420646/reviews) |
| Number of ratings | 1 | **62** |
| Positive 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 | 5 MB | 39 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Spade Apps, LLC](https://appshunter.io/developer/532346089) | [Asad Ahsan](https://appshunter.io/developer/1326954499) |

## What reviewers say

### STA Methods

[App page](https://appshunter.io/ios/app/sta-methods/id657466046)

This app helps college statistics students by providing essential formulas and symbols for homework and study. It also includes a dedicated section for taking notes during class or for later review.

**Highlights:** Key statistics formulas, Essential symbols reference, In-app notes section, Study aid for college statistics, Homework assistance

**Features:** macOS Compatibility

**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 STA Methods free?

STA Methods 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, STA Methods or Calculate Standard Deviation?

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

### Do STA Methods or Calculate Standard Deviation have ads?

Calculate Standard Deviation shows ads; STA Methods does not.

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

STA Methods ships an update every 4 months, and Calculate Standard Deviation every 7 months. Most recently, STA Methods was updated on October 2, 2026 and Calculate Standard Deviation on October 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.*