# Nyquist App vs Smith Chart Touch

The clearest difference is update cadence: Smith Chart Touch at every 3 months against Nyquist App's every 10 months. Nyquist App's advantage is iOS requirement (13.0 vs 15.0). 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.

Nyquist App ships an update every 10 months, Smith Chart Touch every 3 months. Both last shipped on October 2, 2026.

## The numbers

| Metric | Nyquist App | Smith Chart Touch |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 22 MB | 22 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Patricia Pauli](https://appshunter.io/developer/1587769862) | [Sthefano Schiavon](https://appshunter.io/developer/1882733645) |

## 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


### Smith Chart Touch

[App page](https://appshunter.io/ios/app/smith-chart-touch/id6760685457)

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

**In-app purchases:** none


## Frequently asked questions

### Is Nyquist App free?

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

### Is Smith Chart Touch free?

Smith Chart Touch is free to download, with no in-app purchases.

### Do Nyquist App or Smith Chart Touch have ads?

Neither Nyquist App nor Smith Chart Touch shows ads.

### Which is updated more often, Nyquist App or Smith Chart Touch?

Nyquist App ships an update every 10 months, and Smith Chart Touch every 3 months. Most recently, Nyquist App was updated on October 2, 2026 and Smith Chart Touch on October 2, 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.*