# Resistor Tools vs Simple Circuit Builder

The clearest difference is rating: Resistor Tools at 5.0 against Simple Circuit Builder's 4.0. Resistor Tools also leads on review sentiment (75% vs 53%) and iOS requirement (12.0 vs 14.0). Simple Circuit Builder's advantage is in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 2 months). On price, ratings volume, ads and device support there is nothing between them.

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

Resistor Tools holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 10 and 28 respectively. Written reviews point the same way: 75% of Resistor Tools's written reviews are positive against 53% of Simple Circuit Builder's.

Resistor Tools ships an update every 2 months, Simple Circuit Builder every 3 weeks. The most recent releases landed on October 5, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Resistor Tools | Simple Circuit Builder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (10 ratings)](https://appshunter.io/ios/app/resistor-tools/id826045228/reviews)** | [4.0 (28 ratings)](https://appshunter.io/ios/app/simple-circuit-builder/id1294616098/reviews) |
| Number of ratings | 10 | **28** |
| Positive reviews | **75.0% of reviews** | 52.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 4 MB | 14 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [David White](https://appshunter.io/developer/911163945) |

## 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 |


### Simple Circuit Builder

[App page](https://appshunter.io/ios/app/simple-circuit-builder/id1294616098)

This virtual lab offers a hands-on experience for learning about resistors and circuit resistance. Easily build and test series and parallel circuits, measure voltage and current, and understand the impact of component changes in real-time.

**Highlights:** Build circuits with up to eight components, Five component types, Virtual volt and amp meters, Adjustable resistor and voltage values, Real-time circuit analysis, Demonstrates 'Opens' and 'Shorts'

**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 Simple Circuit Builder free?

Simple Circuit Builder is free to download, with no in-app purchases.

### Which has better reviews, Resistor Tools or Simple Circuit Builder?

Resistor Tools is rated higher. Resistor Tools averages 5.0 out of 5 from 10 ratings, while Simple Circuit Builder averages 4.0 from 28 ratings.

### Do Resistor Tools or Simple Circuit Builder have ads?

Neither Resistor Tools nor Simple Circuit Builder shows ads.

### Which is updated more often, Resistor Tools or Simple Circuit Builder?

Resistor Tools ships an update every 2 months, and Simple Circuit Builder every 3 weeks. Most recently, Resistor Tools was updated on October 5, 2026 and Simple Circuit Builder on September 13, 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.*