# Nyquist App vs Epicycles

The clearest difference is update cadence: Epicycles at every 5 days against Nyquist App's every 10 months. Nyquist App's advantage is iOS requirement (13.0 vs 15.0). On price, rating, ratings volume and ads there is nothing between them.

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 Epicycles. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Nyquist App ships an update every 10 months, Epicycles every 5 days. The most recent releases landed on October 2, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Nyquist App | Epicycles |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/nyquist-app/id1444291209/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/epicycles/id6450433959/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 22 MB | 4 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) | [Limit Point Software](https://appshunter.io/developer/377981570) |

## 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


### Epicycles

[App page](https://appshunter.io/ios/app/epicycles/id6450433959)

Explore the visualization of complex Fourier series through interactive epicycles. Create and analyze approximations of parametric curves and complex functions. Save animations and export custom terms for later use.

**Highlights:** Visualize Fourier series of 2D functions, Create epicycles from drawn curves, Save custom terms to documents, Export animations as GIFs, Adjust time and number of terms, Interactive graphic elements

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Nyquist App free?

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

### Is Epicycles free?

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

### Which has better reviews, Nyquist App or Epicycles?

Nyquist App and Epicycles are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Nyquist App or Epicycles have ads?

Neither Nyquist App nor Epicycles shows ads.

### Which is updated more often, Nyquist App or Epicycles?

Nyquist App ships an update every 10 months, and Epicycles every 5 days. Most recently, Nyquist App was updated on October 2, 2026 and Epicycles on September 21, 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.*