# Simple Circuit Builder vs Fabrication Weight Calc Pro

The clearest difference is price: Simple Circuit Builder at Free against Fabrication Weight Calc Pro's $5.99. Simple Circuit Builder also leads on update cadence (every 3 weeks vs every 43 months) and iOS requirement (14.0 vs 16.1). On ads, in-app purchases and device support there is nothing between them.

Simple Circuit Builder is free to download; Fabrication Weight Calc Pro costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Simple Circuit Builder ships an update every 3 weeks, Fabrication Weight Calc Pro every 43 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Simple Circuit Builder | Fabrication Weight Calc Pro |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | **[4.0 (28 ratings)](https://appshunter.io/ios/app/simple-circuit-builder/id1294616098/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 52.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 43 months |
| Monetization | Free | — |
| Size | 14 MB | 1 MB |
| Requires iOS | **14.0** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [David White](https://appshunter.io/developer/911163945) | [Imran Pinjara](https://appshunter.io/developer/1484488781) |

## What reviewers say

### 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


### Fabrication Weight Calc Pro

[App page](https://appshunter.io/ios/app/fabrication-weight-calc-pro/id1488880400)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Simple Circuit Builder free?

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

### Is Fabrication Weight Calc Pro free?

Fabrication Weight Calc Pro costs $5.99, with no in-app purchases.

### Do Simple Circuit Builder or Fabrication Weight Calc Pro have ads?

Neither Simple Circuit Builder nor Fabrication Weight Calc Pro shows ads.

### Which is updated more often, Simple Circuit Builder or Fabrication Weight Calc Pro?

Simple Circuit Builder ships an update every 3 weeks, and Fabrication Weight Calc Pro every 43 months. Most recently, Simple Circuit Builder was updated on November 3, 2026 and Fabrication Weight Calc Pro on November 3, 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.*