# Simple Circuit Builder vs Cassette Air

The clearest difference is ads: Simple Circuit Builder at none against Cassette Air's shown. Simple Circuit Builder also leads on update cadence (every 3 weeks vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Simple Circuit Builder ships an update every 3 weeks, Cassette Air every 2 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Simple Circuit Builder | Cassette Air |
| --- | --- | --- |
| Price | Free | Free |
| 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** | Yes |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 14 MB | 46 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [David White](https://appshunter.io/developer/911163945) | [mohcine badour](https://appshunter.io/developer/6776393430) |

## 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


### Cassette Air

[App page](https://appshunter.io/ios/app/cassette-air/id6776393428)

**Features:** macOS Compatibility, Vision Pro support

**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 Cassette Air free?

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

### Do Simple Circuit Builder or Cassette Air have ads?

Cassette Air shows ads; Simple Circuit Builder does not.

### Which is updated more often, Simple Circuit Builder or Cassette Air?

Simple Circuit Builder ships an update every 3 weeks, and Cassette Air every 2 months. Most recently, Simple Circuit Builder was updated on November 3, 2026 and Cassette Air on October 31, 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.*