Graycode vs Simple Circuit Builder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Graycode
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.
- Decimal, hex, binary, Gray code conversion
- Real-time updates
- Handy calculator for engineers
- Animated Tower of Hanoi solution
- Supports iPhone, iPad, iPod
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This app is used to convert numbers among decimal, hex, binary and gray code. If a user changes any one of these numbers, the other ones will change accordingly. It is a handy calculator for engineers to obtain the binary or gray code values from a decimal, or vise versa. In addition, an animated solution of a Hanoi Tower with three disks is also demonstrated based on the input number.
Simple Circuit Builder
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.
- 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'
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Description This is the BEST app to learn about Resistors and Circuit Resistance (Equivalent Resistance). This virtual lab provides an excellent environment for anyone who is interested in understanding series and parallel resistors, learning how to measure voltages across resistors, current through series and parallel circuits and solving simple circuits. Features - VERY SIMPLE and EASY TO USE, with up to eight component sections. - Component sections can easily be configured from five different types. - VIRTUAL "Hands On" experience using volt and amp meters. - Resistor values can easily be changed with a picker, keypad or using randomize button. - Circuit voltage can easily be changed from 1 to 1000 volts with a picker or a keypad. - The "Basics" screen make this app unique for the simplicity and speed of seeing the effects of "Opens" (resistor component with infinite resistance) and "Shorts" (resistor component with zero resistance). - FREE and NO ADVERTISEMENTS. - The circuit is always "LIVE" and immediately shows voltage, current and circuit resistance with any changes made to the circuit.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Graycode | Simple Circuit Builder |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.0 (2 ratings) | 4.0 (28 ratings) — better |
| Positive reviews | 66.7% of reviews — better | 52.6% of reviews |
| Number of ratings | 2 | 28 — better |
| Update frequency | Every 10 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 2 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Duo Pisceses, Inc. | David White |
Customer experience
Graycode
Simple Circuit Builder
In-app purchases
Graycode
No in-app purchases
Simple Circuit Builder
No in-app purchases
Questions
Is Graycode free?
Is Simple Circuit Builder free?
Which has better reviews, Graycode or Simple Circuit Builder?
Do Graycode or Simple Circuit Builder have ads?
Which is updated more often, Graycode or Simple Circuit Builder?
Other comparisons
