# Resistor Tools vs Unit Converter & Tools

The clearest difference is update cadence: Unit Converter & Tools at every 4 weeks against Resistor Tools's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Resistor Tools sells 1 one-off in-app purchase and Unit Converter & Tools sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Resistor Tools ships an update every 2 months, Unit Converter & Tools every 4 weeks. The most recent releases landed on October 10, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Resistor Tools | Unit Converter & Tools |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 22 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Atif Mumtaz](https://appshunter.io/developer/875232775) |

## 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 |


### Unit Converter & Tools

[App page](https://appshunter.io/ios/app/unit-converter-and-tools/id6759855735)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unitverse Star | $0.99 | per month |


## Frequently asked questions

### Is Resistor Tools free?

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

### Is Unit Converter & Tools free?

Unit Converter & Tools is free to download, with in-app purchases available.

### Do Resistor Tools or Unit Converter & Tools have ads?

Neither Resistor Tools nor Unit Converter & Tools shows ads.

### Which is updated more often, Resistor Tools or Unit Converter & Tools?

Resistor Tools ships an update every 2 months, and Unit Converter & Tools every 4 weeks. Most recently, Resistor Tools was updated on October 10, 2026 and Unit Converter & Tools on October 18, 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.*