# Resistor Tools vs Resistor

The clearest difference is in-app purchases: Resistor at none against Resistor Tools's 1. Resistor Tools's advantage is update cadence (every 2 months vs every 9 months) and iOS requirement (12.0 vs 26.0). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Resistor Tools against 4.9 for Resistor. Both are backed by a comparable volume of ratings — 10 and 17 respectively.

Resistor Tools ships an update every 2 months, Resistor every 9 months. The most recent releases landed on September 24, 2026 and August 27, 2026 respectively.

## The numbers

| Metric | Resistor Tools | Resistor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (10 ratings)](https://appshunter.io/ios/app/resistor-tools/id826045228/reviews)** | [4.9 (17 ratings)](https://appshunter.io/ios/app/resistor-converter/id6446839759/reviews) |
| Number of ratings | 10 | **17** |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 4 MB | 8 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Gerhard Lentschik](https://appshunter.io/developer/629988041) |

## 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 |


### Resistor

[App page](https://appshunter.io/ios/app/resistor-converter/id6446839759)

Quickly calculate resistor values from color bands or SMD codes, and vice versa. This tool is ideal for electronics enthusiasts, students, and DIYers working with 4, 5, or 6-band resistors and various SMD codes. It functions offline and requires no registration.

**Highlights:** Calculate resistor values from color bands, Convert resistor values to color bands, Supports 4, 5, and 6-band resistors, Handles SMD codes (EIA-3, EIA-4, EIA-96), Works offline, No registration required

**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 Resistor free?

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

### Which has better reviews, Resistor Tools or Resistor?

Resistor Tools is rated higher. Resistor Tools averages 5.0 out of 5 from 10 ratings, while Resistor averages 4.9 from 17 ratings.

### Do Resistor Tools or Resistor have ads?

Neither Resistor Tools nor Resistor shows ads.

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

Resistor Tools ships an update every 2 months, and Resistor every 9 months. Most recently, Resistor Tools was updated on September 24, 2026 and Resistor on August 27, 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.*