# Control Systems Engineering vs Root Locus Plotter

The clearest difference is in-app purchases: Root Locus Plotter at none against Control Systems Engineering's 6. Root Locus Plotter also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Control Systems Engineering sells 6 in-app purchases, starting at $9.99 per month. Root Locus Plotter asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on June 11, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Control Systems Engineering | Root Locus Plotter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Size | 18 MB | 30 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [Sthefano Schiavon](https://appshunter.io/developer/1882733645) |

## What reviewers say

### Control Systems Engineering

[App page](https://appshunter.io/ios/app/control-systems-engineering/id6739731886)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


### Root Locus Plotter

[App page](https://appshunter.io/ios/app/root-locus-plotter/id6760122394)

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

**In-app purchases:** none


## Frequently asked questions

### Is Control Systems Engineering free?

Control Systems Engineering is free to download, with in-app purchases available.

### Is Root Locus Plotter free?

Root Locus Plotter is free to download, with no in-app purchases.

### Do Control Systems Engineering or Root Locus Plotter have ads?

Neither Control Systems Engineering nor Root Locus Plotter shows ads.

### Which is updated more often, Control Systems Engineering or Root Locus Plotter?

Control Systems Engineering ships an update every 3 months, and Root Locus Plotter every 3 months. Most recently, Control Systems Engineering was updated on June 11, 2026 and Root Locus Plotter on September 16, 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.*