# Stepper Motor Calculator vs Controller Diagnostics

The clearest difference is price: Controller Diagnostics at Free against Stepper Motor Calculator's $2.99. Controller Diagnostics also leads on update cadence (every 3 weeks vs every 32 months). Stepper Motor Calculator's advantage is iOS requirement (13 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

Controller Diagnostics is free to download; Stepper Motor Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stepper Motor Calculator ships an update every 32 months, Controller Diagnostics every 3 weeks. The most recent releases landed on February 22, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Stepper Motor Calculator | Controller Diagnostics |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 3 weeks** |
| Size | 1 MB | 2 MB |
| Requires iOS | **13** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Lykketronic AS](https://appshunter.io/developer/1297619408) |

## What reviewers say

### Stepper Motor Calculator

[App page](https://appshunter.io/ios/app/stepper-motor-calculator/id1367815636)

**Features:** macOS Compatibility

**In-app purchases:** none


### Controller Diagnostics

[App page](https://appshunter.io/ios/app/controller-diagnostics/id6444090201)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Stepper Motor Calculator free?

Stepper Motor Calculator costs $2.99, with no in-app purchases.

### Is Controller Diagnostics free?

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

### Do Stepper Motor Calculator or Controller Diagnostics have ads?

Neither Stepper Motor Calculator nor Controller Diagnostics shows ads.

### Which is updated more often, Stepper Motor Calculator or Controller Diagnostics?

Stepper Motor Calculator ships an update every 32 months, and Controller Diagnostics every 3 weeks. Most recently, Stepper Motor Calculator was updated on February 22, 2026 and Controller Diagnostics on September 17, 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.*