# Resistor Tools vs Resistor Code Calculators

The clearest difference is in-app purchases: Resistor Code Calculators at none against Resistor Tools's 1. Resistor Tools's advantage is ads (none vs shown) and update cadence (every 2 months vs every 7 months). On price, device support and iOS requirement there is nothing between them.

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

Resistor Tools ships an update every 2 months, Resistor Code Calculators every 7 months. The most recent releases landed on September 24, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Resistor Tools | Resistor Code Calculators |
| --- | --- | --- |
| 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** | Yes |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 6 MB |
| Requires iOS | **12.0** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Kanta Kikubo](https://appshunter.io/developer/1450598215) |

## 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 Code Calculators

[App page](https://appshunter.io/ios/app/resistor-code-calculators/id1465336419)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Resistor Tools free?

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

### Is Resistor Code Calculators free?

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

### Do Resistor Tools or Resistor Code Calculators have ads?

Resistor Code Calculators shows ads; Resistor Tools does not.

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

Resistor Tools ships an update every 2 months, and Resistor Code Calculators every 7 months. Most recently, Resistor Tools was updated on September 24, 2026 and Resistor Code Calculators 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.*