# Graycode vs Travel Calculator & Currency

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.

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.

## The numbers

| Metric | Graycode | Travel Calculator & Currency |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/graycode/id548428653/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 2 MB | 5 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) | [YA-CHEN CHUANG](https://appshunter.io/developer/1713112773) |

## 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


### Travel Calculator & Currency

[App page](https://appshunter.io/ios/app/travel-calculator-and-currency/id6470177317)

**In-app purchases:** none


## Frequently asked questions

### Is Graycode free?

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

### Is Travel Calculator & Currency free?

Travel Calculator & Currency is free to download, with no in-app purchases.

### Do Graycode or Travel Calculator & Currency have ads?

Travel Calculator & Currency shows ads; Graycode does not.

### Which is updated more often, Graycode or Travel Calculator & Currency?

Graycode ships an update every 10 months, and Travel Calculator & Currency every 3 weeks. Most recently, Graycode was updated on August 26, 2026 and Travel Calculator & Currency on September 21, 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.*