# Standard Deviation Calculator vs File Guard Pro

The clearest difference is rating: File Guard Pro at 4.5 against Standard Deviation Calculator's 2.4. File Guard Pro also leads on in-app purchases (none vs 1). Standard Deviation Calculator's advantage is ratings volume (24 vs 2) and iOS requirement (6.1 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Standard Deviation Calculator sells 1 one-off in-app purchase. File Guard Pro asks for nothing beyond the download.

File Guard Pro holds the better App Store score, 4.5 against 2.4. That said, the two scores are not equally well evidenced: Standard Deviation Calculator has 24 ratings behind it against 2, so its average is the more settled of the two.

Standard Deviation Calculator ships an update every 5 weeks, File Guard Pro every 2 months. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Standard Deviation Calculator | File Guard Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (24 ratings)](https://appshunter.io/ios/app/standard-deviation-calculator/id721321543/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/file-guard-pro/id6742727006/reviews)** |
| Number of ratings | **24** | 2 |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 2 MB | 2 MB |
| Requires iOS | **6.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Keely Hill](https://appshunter.io/developer/1039644107) | [斌 虞](https://appshunter.io/developer/561889393) |

## What reviewers say

### Standard Deviation Calculator

[App page](https://appshunter.io/ios/app/standard-deviation-calculator/id721321543)

Calculate statistical measures like standard deviation, mean, variance, and median for a dataset. It also offers population deviation and the ability to compute z-scores based on your input data.

**Highlights:** Calculate standard deviation, Calculate mean (average), Calculate variance, Calculate population deviation, Calculate median, Calculate Q1 & Q3, Calculate z-score

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| More Results | Free | one-time |


### File Guard Pro

[App page](https://appshunter.io/ios/app/file-guard-pro/id6742727006)

Securely encrypt and decrypt your files with this powerful cryptography tool. It offers a user-friendly interface for protecting confidential information quickly and efficiently. Based on a customized, reliable algorithm, it provides stronger security than many public tools.

**Highlights:** File encryption, File decryption, Customized cryptography algorithm, User-friendly interface, Fast performance, Confidential information security

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Standard Deviation Calculator free?

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

### Is File Guard Pro free?

File Guard Pro is free to download, with no in-app purchases.

### Which has better reviews, Standard Deviation Calculator or File Guard Pro?

File Guard Pro is rated higher. Standard Deviation Calculator averages 2.4 out of 5 from 24 ratings, while File Guard Pro averages 4.5 from 2 ratings.

### Do Standard Deviation Calculator or File Guard Pro have ads?

Neither Standard Deviation Calculator nor File Guard Pro shows ads.

### Which is updated more often, Standard Deviation Calculator or File Guard Pro?

Standard Deviation Calculator ships an update every 5 weeks, and File Guard Pro every 2 months. Most recently, Standard Deviation Calculator was updated on October 12, 2026 and File Guard Pro on October 13, 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.*