# Fourier App vs ControlsLab

The clearest difference is in-app purchases: Fourier App at none against ControlsLab's 1. Fourier App also leads on iOS requirement (13.0 vs 18.5). ControlsLab's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. ControlsLab sells 1 one-off in-app purchase. Fourier App asks for nothing beyond the download.

## The numbers

| Metric | Fourier App | ControlsLab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/controlslab/id6763078520/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | — |
| Monetization | — | Free with in-app purchases |
| Size | 30 MB | 1 MB |
| Requires iOS | **13.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sthefano Schiavon](https://appshunter.io/developer/1882733645) | [Pedro Resto](https://appshunter.io/developer/1895152088) |

## What reviewers say

### Fourier App

[App page](https://appshunter.io/ios/app/fourier-app/id6760314201)

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

**In-app purchases:** none


### ControlsLab

[App page](https://appshunter.io/ios/app/controlslab/id6763078520)

This app offers a professional-grade simulator for system dynamics and control systems. It allows users to visualize and interact with mass-spring-damper systems and control loops without coding. Explore parameters, inputs, and analysis modes with real-time visual feedback.

**Highlights:** Real-time system simulation, Parameter adjustment with sliders, Live time-domain response plot, S-plane pole visualization, Open-loop and closed-loop modes, PID controller tuning, Bode plot analysis

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ControlsLab Pro | $4.99 | one-time |


## Frequently asked questions

### Is Fourier App free?

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

### Is ControlsLab free?

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

### Do Fourier App or ControlsLab have ads?

Fourier App shows ads; ControlsLab does not.

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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.*