# eigenCalc vs ControlsLab

The clearest difference is in-app purchases: eigenCalc at none against ControlsLab's 1. eigenCalc also leads on iOS requirement (15.5 vs 18.5). On price, ads and device support there is nothing between them.

Both are free to download. ControlsLab sells 1 one-off in-app purchase. eigenCalc asks for nothing beyond the download.

## The numbers

| Metric | eigenCalc | ControlsLab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/controlslab/id6763078520/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 1 MB |
| Requires iOS | **15.5** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Luis Acevedo-Arreguin](https://appshunter.io/developer/1642773653) | [Pedro Resto](https://appshunter.io/developer/1895152088) |

## What reviewers say

### eigenCalc

[App page](https://appshunter.io/ios/app/eigencalc/id6503222785)

**Features:** macOS Compatibility

**In-app purchases:** none


### ControlsLab

[App page](https://appshunter.io/ios/app/controlslab/id6763078520)

This app offers a professional-grade simulator for system dynamics and control systems. It allows users to visualize and interact with mass-spring-damper systems and control loops without coding. Explore parameters, inputs, and analysis modes with real-time visual feedback.

**Highlights:** Real-time system simulation, Parameter adjustment with sliders, Live time-domain response plot, S-plane pole visualization, Open-loop and closed-loop modes, PID controller tuning, Bode plot analysis

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ControlsLab Pro | $4.99 | one-time |


## Frequently asked questions

### Is eigenCalc free?

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

### Is ControlsLab free?

ControlsLab is free to download, with in-app purchases available.

### Do eigenCalc or ControlsLab have ads?

Neither eigenCalc nor ControlsLab shows ads.

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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.*