# SISO Calculator vs CommandTurtle

The clearest difference is iOS requirement: SISO Calculator at 14.0 against CommandTurtle's 17.0. 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.

## The numbers

| Metric | SISO Calculator | CommandTurtle |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/siso-calculator/id1548141101/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | — |
| Monetization | Free | — |
| Size | 4 MB | 1 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Deft Dynamics LLC](https://appshunter.io/developer/1288783778) | [Alpay Calalli](https://appshunter.io/developer/1708422157) |

## What reviewers say

### SISO Calculator

[App page](https://appshunter.io/ios/app/siso-calculator/id1548141101)

This app helps engineers and students understand System Dynamics and Controls. It offers an intuitive interface to quickly analyze controller and plant interactions in both time and frequency domains.

**Highlights:** System Dynamics analysis, Controls engineering, Intuitive interface, Time domain analysis, Frequency domain analysis, Controller interaction visualization

**Features:** macOS Compatibility

**In-app purchases:** none


### CommandTurtle

[App page](https://appshunter.io/ios/app/commandturtle/id6738128774)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SISO Calculator free?

SISO Calculator is free to download, with no in-app purchases.

### Is CommandTurtle free?

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

### Do SISO Calculator or CommandTurtle have ads?

Neither SISO Calculator nor CommandTurtle shows ads.

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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.*