# Nyquist App vs Learn Control Systems

The clearest difference is in-app purchases: Nyquist App at none against Learn Control Systems's 1. Nyquist App also leads on iOS requirement (13.0 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Learn Control Systems sells 1 one-off in-app purchase. Nyquist App asks for nothing beyond the download.

Nyquist App ships an update every 10 months, Learn Control Systems every 16 months. The most recent releases landed on September 14, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Nyquist App | Learn Control Systems |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nyquist-app/id1444291209/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 16 months |
| Monetization | Free | — |
| Size | 22 MB | 28 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Patricia Pauli](https://appshunter.io/developer/1587769862) | [Ghumman Tech LLC](https://appshunter.io/developer/1671347750) |

## What reviewers say

### Nyquist App

[App page](https://appshunter.io/ios/app/nyquist-app/id1444291209)

Practice the Nyquist stability criterion to determine closed-loop stability from open-loop frequency response. Developed for an introductory control engineering course, this app offers self-contained content for anyone interested in the topic.

**Highlights:** Nyquist stability criterion practice, Determine closed-loop stability, Frequency response analysis, Self-contained educational content, Developed for control engineering course

**Features:** macOS Compatibility

**In-app purchases:** none


### Learn Control Systems

[App page](https://appshunter.io/ios/app/learn-control-systems/id6446431258)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $9.99 | one-time |


## Frequently asked questions

### Is Nyquist App free?

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

### Is Learn Control Systems free?

Learn Control Systems is free to download, with in-app purchases available.

### Do Nyquist App or Learn Control Systems have ads?

Neither Nyquist App nor Learn Control Systems shows ads.

### Which is updated more often, Nyquist App or Learn Control Systems?

Nyquist App ships an update every 10 months, and Learn Control Systems every 16 months. Most recently, Nyquist App was updated on September 14, 2026 and Learn Control Systems 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.*