# SimpleSigma+ vs sci.calculator

The clearest difference is price: sci.calculator at Free against SimpleSigma+'s $3.99. sci.calculator also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.1). SimpleSigma+'s advantage is in-app purchases (none vs 1). On update cadence and ads there is nothing between them.

sci.calculator is free to download; SimpleSigma+ costs $3.99 up front. sci.calculator sells 1 one-off in-app purchase. SimpleSigma+ asks for nothing beyond the download.

SimpleSigma+ ships an update every 3 weeks, sci.calculator every 5 weeks. The most recent releases landed on September 30, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | SimpleSigma+ | sci.calculator |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Size | 1 MB | 49 MB |
| Requires iOS | 17.1 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YUKARI KIKUCHI](https://appshunter.io/developer/1324432413) | [Yukihiro Shioya](https://appshunter.io/developer/1565306192) |

## What reviewers say

### SimpleSigma+

[App page](https://appshunter.io/ios/app/simplesigma-plus/id1522991950)

**Features:** macOS Compatibility

**In-app purchases:** none


### sci.calculator

[App page](https://appshunter.io/ios/app/scicalculator/id1620728508)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is SimpleSigma+ free?

SimpleSigma+ costs $3.99, with no in-app purchases.

### Is sci.calculator free?

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

### Do SimpleSigma+ or sci.calculator have ads?

Neither SimpleSigma+ nor sci.calculator shows ads.

### Which is updated more often, SimpleSigma+ or sci.calculator?

SimpleSigma+ ships an update every 3 weeks, and sci.calculator every 5 weeks. Most recently, SimpleSigma+ was updated on September 30, 2026 and sci.calculator on September 11, 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.*