Graycode vs LED Calc.
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.
LED Calc.
This application assists in designing electronic circuits by calculating the necessary resistor values for LEDs. It simplifies the process of determining the correct components for your LED projects.
- Resistor value calculation
- LED circuit design assistance
- Component value determination
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This app calculates the value of resistor, when designing a circuit using LED.
Screenshots
Verdict
The clearest difference is price: LED Calc. at Free against Graycode's $2.99. Graycode's advantage is rating (3.0 vs 1.0) and ads (none vs shown). On ratings volume, update cadence, 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
LED Calc. is free to download; Graycode costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Graycode holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 67% of Graycode's written reviews are positive against 50% of LED Calc.'s.
Both ship on a similar rhythm, roughly every 10 months. The most recent releases landed on August 26, 2026 and June 5, 2026 respectively.
| Parameter | Graycode | LED Calc. |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.0 (2 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 66.7% of reviews — better | 50.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 10 months | Every 10 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 2 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Duo Pisceses, Inc. | Jibiki Works |
Customer experience
Graycode
LED Calc.
In-app purchases
Graycode
No in-app purchases
LED Calc.
No in-app purchases
Questions
Is Graycode free?
Is LED Calc. free?
Which has better reviews, Graycode or LED Calc.?
Do Graycode or LED Calc. have ads?
Which is updated more often, Graycode or LED Calc.?
Other comparisons
