# Simple Circuit Builder vs Turtle Universe

The clearest difference is rating: Turtle Universe at 4.6 against Simple Circuit Builder's 4.0. Turtle Universe also leads on review sentiment (67% vs 53%). Simple Circuit Builder's advantage is update cadence (every 3 weeks vs every 6 weeks). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

Turtle Universe holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 28 and 52 respectively. Written reviews point the same way: 53% of Simple Circuit Builder's written reviews are positive against 67% of Turtle Universe's.

Simple Circuit Builder ships an update every 3 weeks, Turtle Universe every 6 weeks. The most recent releases landed on November 3, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Simple Circuit Builder | Turtle Universe |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (28 ratings)](https://appshunter.io/ios/app/simple-circuit-builder/id1294616098/reviews) | **[4.6 (52 ratings)](https://appshunter.io/ios/app/turtle-universe/id1455235317/reviews)** |
| Number of ratings | 28 | **52** |
| Positive reviews | 52.6% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 14 MB | 120 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David White](https://appshunter.io/developer/911163945) | [Turtle Sim LLC](https://appshunter.io/developer/1568741108) |

## 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


### Turtle Universe

[App page](https://appshunter.io/ios/app/turtle-universe/id1455235317)

Explore and learn about scientific phenomena through interactive microworlds. Create your own simulations using text or blocks, and engage with a global community of young learners. Discover over 100 scientific models and create computational art and games.

**Highlights:** Explore 100+ scientific models, Create custom microworlds, Code with text or blocks, Investigate phenomena, Engage in global discussions, Create computational art and games

**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 Turtle Universe free?

Turtle Universe is free to download, with no in-app purchases.

### Which has better reviews, Simple Circuit Builder or Turtle Universe?

Turtle Universe is rated higher. Simple Circuit Builder averages 4.0 out of 5 from 28 ratings, while Turtle Universe averages 4.6 from 52 ratings.

### Do Simple Circuit Builder or Turtle Universe have ads?

Neither Simple Circuit Builder nor Turtle Universe shows ads.

### Which is updated more often, Simple Circuit Builder or Turtle Universe?

Simple Circuit Builder ships an update every 3 weeks, and Turtle Universe every 6 weeks. Most recently, Simple Circuit Builder was updated on November 3, 2026 and Turtle Universe on November 2, 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.*