# Graycode vs Simple Circuit Builder

The clearest difference is price: Simple Circuit Builder at Free against Graycode's $2.99. Simple Circuit Builder also leads on rating (4.0 vs 3.0) and update cadence (every 3 weeks vs every 10 months). Graycode's advantage is review sentiment (67% vs 53%) and iOS requirement (12.0 vs 14.0). On ads, in-app purchases and device support there is nothing between them.

Simple Circuit Builder is free to download; Graycode costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Simple Circuit Builder holds the better App Store score, 4.0 against 3.0. That said, the two scores are not equally well evidenced: Simple Circuit Builder has 28 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 67% of Graycode's written reviews are positive against 53% of Simple Circuit Builder's, so the app with the better star average is not the one people write more warmly about.

Graycode ships an update every 10 months, Simple Circuit Builder every 3 weeks. The most recent releases landed on September 25, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Graycode | Simple Circuit Builder |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/graycode/id548428653/reviews) | **[4.0 (28 ratings)](https://appshunter.io/ios/app/simple-circuit-builder/id1294616098/reviews)** |
| Number of ratings | 2 | **28** |
| Positive reviews | **66.7% of reviews** | 52.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 14 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) | [David White](https://appshunter.io/developer/911163945) |

## What reviewers say

### Graycode

[App page](https://appshunter.io/ios/app/graycode/id548428653)

This utility converts numbers between decimal, hexadecimal, binary, and Gray code formats. Changes to one value automatically update the others, making it a convenient tool for engineers. It also features an animated demonstration of the Tower of Hanoi puzzle.

**Highlights:** Decimal, hex, binary, Gray code conversion, Real-time updates, Handy calculator for engineers, Animated Tower of Hanoi solution, Supports iPhone, iPad, iPod

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

**In-app purchases:** none


### 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 Graycode free?

Graycode costs $2.99, with no in-app purchases.

### Is Simple Circuit Builder free?

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

### Which has better reviews, Graycode or Simple Circuit Builder?

Simple Circuit Builder is rated higher. Graycode averages 3.0 out of 5 from 2 ratings, while Simple Circuit Builder averages 4.0 from 28 ratings.

### Do Graycode or Simple Circuit Builder have ads?

Neither Graycode nor Simple Circuit Builder shows ads.

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

Graycode ships an update every 10 months, and Simple Circuit Builder every 3 weeks. Most recently, Graycode was updated on September 25, 2026 and Simple Circuit Builder on October 1, 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.*