Nyquist App vs SISO Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Nyquist App
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.
- Nyquist stability criterion practice
- Determine closed-loop stability
- Frequency response analysis
- Self-contained educational content
- Developed for control engineering course
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In this app, you can practice the Nyquist stability criterion. With the Nyquist stability criterion, you can determine the stability of the closed loop based on the frequency response of the open loop, without explicitly calculating the poles of the closed loop. This app was developed at the Institute for Systems Theory and Automatic Control of the University of Stuttgart and accompanies the course "Einführung in die Regelungstechnik" at the University of Stuttgart. Nevertheless, the content and tasks are self-contained, and we encourage all interested in this topic to play with the app and practice the Nyquist stability criterion.
SISO Calculator
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.
- System Dynamics analysis
- Controls engineering
- Intuitive interface
- Time domain analysis
- Frequency domain analysis
- Controller interaction visualization
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SISO Calculator was built to help practicing engineers and students get an intuitive sense of System Dynamics and Controls. The interface is focused so you can quickly interact with controllers and plants to see immediately how time and frequency interact and how controllers behave.
Screenshots
Verdict
The clearest difference is update cadence: SISO Calculator at every 5 weeks against Nyquist App's every 10 months. SISO Calculator also leads on ratings volume (3 vs 1). On price, rating, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Nyquist App against 5.0 for SISO Calculator. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
Nyquist App ships an update every 10 months, SISO Calculator every 5 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | Nyquist App | SISO Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (3 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 10 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 22 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Patricia Pauli | Deft Dynamics |
Customer experience
Nyquist App
SISO Calculator
In-app purchases
Nyquist App
No in-app purchases
SISO Calculator
No in-app purchases
Questions
Is Nyquist App free?
Is SISO Calculator free?
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