# Bode Plot App vs Control System Calc

The clearest difference is in-app purchases: Bode Plot App at none against Control System Calc's 1. Bode Plot App also leads on ads (none vs shown). Control System Calc's advantage is update cadence (fortnightly vs every 5 months) and iOS requirement (17.0 vs 26.2). On price and device support there is nothing between them.

Both are free to download. Control System Calc sells 1 one-off in-app purchase. Bode Plot App asks for nothing beyond the download.

Bode Plot App ships an update every 5 months, Control System Calc fortnightly. The most recent releases landed on November 13, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Bode Plot App | Control System Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Fortnightly** |
| Size | 1 MB | 10 MB |
| Requires iOS | 26.2 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuta Nishimatsu](https://appshunter.io/developer/1480004995) | [洋 刘](https://appshunter.io/developer/6775317751) |

## What reviewers say

### Bode Plot App

[App page](https://appshunter.io/ios/app/bode-plot-app/id6756905343)

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

**In-app purchases:** none


### Control System Calc

[App page](https://appshunter.io/ios/app/control-system-calc/id6791956580)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Control System Calc Pro | $3.99 | one-time |


## Frequently asked questions

### Is Bode Plot App free?

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

### Is Control System Calc free?

Control System Calc is free to download, with in-app purchases available.

### Do Bode Plot App or Control System Calc have ads?

Control System Calc shows ads; Bode Plot App does not.

### Which is updated more often, Bode Plot App or Control System Calc?

Bode Plot App ships an update every 5 months, and Control System Calc fortnightly. Most recently, Bode Plot App was updated on November 13, 2026 and Control System Calc on November 10, 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.*