# Standard Deviation vs Confidence Interval Calc

The clearest difference is update cadence: Confidence Interval Calc at every 6 days against Standard Deviation's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Standard Deviation ships an update every 2 months, Confidence Interval Calc every 6 days. The most recent releases landed on September 12, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Standard Deviation | Confidence Interval Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Size | 21 MB | 30 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ahmad Sattar](https://appshunter.io/developer/1458483953) | [Arsosa Network Inc.](https://appshunter.io/developer/1209042440) |

## What reviewers say

### Standard Deviation

[App page](https://appshunter.io/ios/app/standard-deviation-calculator/id6444146244)

**In-app purchases:** none


### Confidence Interval Calc

[App page](https://appshunter.io/ios/app/confidence-interval-calc/id6749201174)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Standard Deviation free?

Standard Deviation is free to download, with no in-app purchases.

### Is Confidence Interval Calc free?

Confidence Interval Calc is free to download, with no in-app purchases.

### Do Standard Deviation or Confidence Interval Calc have ads?

Neither Standard Deviation nor Confidence Interval Calc shows ads.

### Which is updated more often, Standard Deviation or Confidence Interval Calc?

Standard Deviation ships an update every 2 months, and Confidence Interval Calc every 6 days. Most recently, Standard Deviation was updated on September 12, 2026 and Confidence Interval Calc on September 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.*