# Simple Circuit Builder vs LT Service

The clearest difference is update cadence: Simple Circuit Builder at every 3 weeks against LT Service's every 7 months. LT Service's advantage is iOS requirement (12.0 vs 14.0). On price, ads, in-app purchases and device support 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, LT Service every 7 months. The most recent releases landed on September 13, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Simple Circuit Builder | LT Service |
| --- | --- | --- |
| 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 | No |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Monetization | Free | — |
| Size | 14 MB | 33 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David White](https://appshunter.io/developer/911163945) | [领达电子科技(珠海)有限公司](https://appshunter.io/developer/1766883781) |

## 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


### LT Service

[App page](https://appshunter.io/ios/app/lt-service/id6670597407)

**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 LT Service free?

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

### Do Simple Circuit Builder or LT Service have ads?

Neither Simple Circuit Builder nor LT Service shows ads.

### Which is updated more often, Simple Circuit Builder or LT Service?

Simple Circuit Builder ships an update every 3 weeks, and LT Service every 7 months. Most recently, Simple Circuit Builder was updated on September 13, 2026 and LT Service on September 19, 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.*