# Standard Deviation Calculate vs Probability

The clearest difference is rating: Standard Deviation Calculate at 4.3 against Probability's 1.0. Standard Deviation Calculate also leads on monetization model (free vs free with in-app purchases) and ratings volume (3 vs 1). Probability's advantage is update cadence (every 10 days vs every 2 months). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Standard Deviation Calculate sells 1 one-off in-app purchase and Probability sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Standard Deviation Calculate holds the better App Store score, 4.3 against 1.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Standard Deviation Calculate ships an update every 2 months, Probability every 10 days. The most recent releases landed on September 28, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | Standard Deviation Calculate | Probability |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (3 ratings)](https://appshunter.io/ios/app/standard-deviation-calculate/id1600862053/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/probability-easy-and-practical/id1625073969/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 5 MB | 166 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [天一 邓](https://appshunter.io/developer/1056154014) | [Man Hung Sun](https://appshunter.io/developer/1471605573) |

## What reviewers say

### Standard Deviation Calculate

[App page](https://appshunter.io/ios/app/standard-deviation-calculate/id1600862053)

This utility calculates the standard deviation of a dataset, a key statistical measure of data dispersion. It helps understand how spread out values are from the average, with applications in science, industry, and finance.

**Highlights:** Calculate standard deviation, Measure data dispersion, Understand variation from mean, Applications in science and finance, Statistical analysis tool

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 标准差计算器专业版 | $2.99 | one-time |


### Probability

[App page](https://appshunter.io/ios/app/probability-easy-and-practical/id1625073969)

Enhance your decision-making skills by learning to assess probabilities with this app. It offers formulas for problem-solving, note-taking capabilities, and interactive tools like dice and coin tosses for practical learning.

**Highlights:** Probability assessment, Decision-making improvement, Problem-solving formulas, Personalized notes, Dice and coin toss simulations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade | $0.99 | one-time |


## Frequently asked questions

### Is Standard Deviation Calculate free?

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

### Is Probability free?

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

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

Standard Deviation Calculate is rated higher. Standard Deviation Calculate averages 4.3 out of 5 from 3 ratings, while Probability averages 1.0 from 1 ratings.

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

Neither Standard Deviation Calculate nor Probability shows ads.

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

Standard Deviation Calculate ships an update every 2 months, and Probability every 10 days. Most recently, Standard Deviation Calculate was updated on September 28, 2026 and Probability on September 4, 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.*