Graycode vs Travel Calculator & Currency
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.
Travel Calculator & Currency
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When traveling abroad, we often find ourselves switching between calculator apps and exchange rate apps. Dealing with discounts and taxes can be a real challenge when trying to calculate costs. TravelCalculator combines a calculator, currency exchange, discount calculations, tax computations, and tip calculations into one convenient app, making it an essential shopping assistant for your travels to different countries! Travel Calculator Currency exchange, discounts, tips, consumption tax, and calculations all in one. Modify the formula You can modify long calculations without having to type them all over again. Tips & Taxes Calculate service charges (tips) or after-tax selling price with one click. Tax Refund Get tax refund amount with one click. Exchange Rate Modes Three Setting modes of Exchange Rate : Latest, Custom, On Specified Date. More than 160 countries Provide currency exchange rates for multiple countries. Search Currencies Search by currency or country name (currently available in English and Traditional Chinese).
Screenshots
Verdict
The clearest difference is price: Travel Calculator & Currency at Free against Graycode's $2.99. Travel Calculator & Currency also leads on update cadence (every 3 weeks vs every 10 months). Graycode's advantage is ads (none vs shown) and iOS requirement (12.0 vs 15.0). On 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
Travel Calculator & Currency is free to download; Graycode costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Graycode ships an update every 10 months, Travel Calculator & Currency every 3 weeks. The most recent releases landed on August 26, 2026 and September 21, 2026 respectively.
| Parameter | Graycode | Travel Calculator & Currency |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 10 months | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 2 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Duo Pisceses, Inc. | YA-CHEN CHUANG |
In-app purchases
Graycode
No in-app purchases
Travel Calculator & Currency
No in-app purchases
Questions
Is Graycode free?
Is Travel Calculator & Currency free?
Do Graycode or Travel Calculator & Currency have ads?
Which is updated more often, Graycode or Travel Calculator & Currency?
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