# SISO Calculator vs Bode Plot Calculator

The clearest difference is price: SISO Calculator at Free against Bode Plot Calculator's $3.99. SISO Calculator also leads on update cadence (every 5 weeks vs every 12 months) and ratings volume (3 vs 1). On rating, review sentiment, ads and in-app purchases there is nothing between them.

SISO Calculator is free to download; Bode Plot Calculator costs $3.99 up front. 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 SISO Calculator against 5.0 for Bode Plot Calculator. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

SISO Calculator ships an update every 5 weeks, Bode Plot Calculator every 12 months. The most recent releases landed on June 3, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | SISO Calculator | Bode Plot Calculator |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/siso-calculator/id1548141101/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/bode-plot-calculator/id6496601138/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 12 months |
| Monetization | **Free** | Paid |
| Size | 4 MB | 9 MB |
| Requires iOS | **14.0** | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Deft Dynamics LLC](https://appshunter.io/developer/1288783778) | [Edoardo Orzes](https://appshunter.io/developer/1665361246) |

## What reviewers say

### SISO Calculator

[App page](https://appshunter.io/ios/app/siso-calculator/id1548141101)

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.

**Highlights:** System Dynamics analysis, Controls engineering, Intuitive interface, Time domain analysis, Frequency domain analysis, Controller interaction visualization

**Features:** macOS Compatibility

**In-app purchases:** none


### Bode Plot Calculator

[App page](https://appshunter.io/ios/app/bode-plot-calculator/id6496601138)

This advanced calculator is designed for creating Bode plots and Nyquist diagrams. It also supports complex number calculations and time-domain graphing. Users can export plots and calculations for further analysis.

**Highlights:** Bode Plot generation, Nyquist Diagram visualization, Complex number calculations, Time-domain graphing, Export plots and calculations, Intuitive interface with themes, Sliders for real-time parameter changes

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

**In-app purchases:** none


## Frequently asked questions

### Is SISO Calculator free?

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

### Is Bode Plot Calculator free?

Bode Plot Calculator costs $3.99, with no in-app purchases.

### Which has better reviews, SISO Calculator or Bode Plot Calculator?

SISO Calculator and Bode Plot Calculator are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do SISO Calculator or Bode Plot Calculator have ads?

Neither SISO Calculator nor Bode Plot Calculator shows ads.

### Which is updated more often, SISO Calculator or Bode Plot Calculator?

SISO Calculator ships an update every 5 weeks, and Bode Plot Calculator every 12 months. Most recently, SISO Calculator was updated on June 3, 2026 and Bode Plot Calculator 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.*