# Resistor Tools vs ModuleDesignTools

The clearest difference is in-app purchases: ModuleDesignTools at none against Resistor Tools's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Resistor Tools sells 1 one-off in-app purchase. ModuleDesignTools asks for nothing beyond the download.

Resistor Tools ships an update every 2 months, ModuleDesignTools monthly. The most recent releases landed on October 5, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Resistor Tools | ModuleDesignTools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (10 ratings)](https://appshunter.io/ios/app/resistor-tools/id826045228/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 102 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [深圳炜煌打印机有限公司](https://appshunter.io/developer/1755521906) |

## What reviewers say

### Resistor Tools

[App page](https://appshunter.io/ios/app/resistor-tools/id826045228)

This utility app provides a suite of tools for calculating and determining resistor values. It assists hobbyists and engineers with series, parallel, and voltage divider calculations, as well as inverting amplifier gain.

**Highlights:** Series and parallel resistor calculation, Resistor combination finder, Voltage divider ratio and value calculation, Inverting amplifier gain calculation, Save combinations to CSV

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock pro feature | $0.99 | one-time |


### ModuleDesignTools

[App page](https://appshunter.io/ios/app/moduledesigntools/id6748936667)

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

**In-app purchases:** none


## Frequently asked questions

### Is Resistor Tools free?

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

### Is ModuleDesignTools free?

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

### Do Resistor Tools or ModuleDesignTools have ads?

Neither Resistor Tools nor ModuleDesignTools shows ads.

### Which is updated more often, Resistor Tools or ModuleDesignTools?

Resistor Tools ships an update every 2 months, and ModuleDesignTools monthly. Most recently, Resistor Tools was updated on October 5, 2026 and ModuleDesignTools on October 4, 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.*