# Permutation and Combination vs Calculate Standard Deviation

The clearest difference is in-app purchases: Permutation and Combination at none against Calculate Standard Deviation's 1. Permutation and Combination also leads on ads (none vs shown) and iOS requirement (12.1 vs 15.0). Calculate Standard Deviation's advantage is rating (4.5 vs 4.1) and update cadence (every 7 months vs every 40 months). On price, review sentiment and device support there is nothing between them.

Both are free to download. Calculate Standard Deviation sells 1 one-off in-app purchase. Permutation and Combination asks for nothing beyond the download.

Calculate Standard Deviation holds the better App Store score, 4.5 against 4.1. Both are backed by a comparable volume of ratings — 13 and 62 respectively. Written reviews point the same way: 44% of Permutation and Combination's written reviews are positive against 50% of Calculate Standard Deviation's.

Permutation and Combination ships an update every 40 months, Calculate Standard Deviation every 7 months. The most recent releases landed on September 10, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Permutation and Combination | Calculate Standard Deviation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (13 ratings)](https://appshunter.io/ios/app/permutation-and-combination/id1006634963/reviews) | **[4.5 (62 ratings)](https://appshunter.io/ios/app/calculate-standard-deviation/id1591420646/reviews)** |
| Number of ratings | 13 | **62** |
| Positive reviews | 44.4% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 40 months | **Every 7 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 23 MB | 39 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Keiji Matsui](https://appshunter.io/developer/365287272) | [Asad Ahsan](https://appshunter.io/developer/1326954499) |

## What reviewers say

### Permutation and Combination

[App page](https://appshunter.io/ios/app/permutation-and-combination/id1006634963)

Easily calculate permutations and combinations with this educational tool. It provides a straightforward way to solve mathematical problems related to arrangements and selections.

**Highlights:** Calculate permutations, Calculate combinations, Easy to use interface, Educational tool

**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 Permutation and Combination free?

Permutation and Combination 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, Permutation and Combination or Calculate Standard Deviation?

Calculate Standard Deviation is rated higher. Permutation and Combination averages 4.1 out of 5 from 13 ratings, while Calculate Standard Deviation averages 4.5 from 62 ratings.

### Do Permutation and Combination or Calculate Standard Deviation have ads?

Calculate Standard Deviation shows ads; Permutation and Combination does not.

### Which is updated more often, Permutation and Combination or Calculate Standard Deviation?

Permutation and Combination ships an update every 40 months, and Calculate Standard Deviation every 7 months. Most recently, Permutation and Combination was updated on September 10, 2026 and Calculate Standard Deviation on September 22, 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.*