# Graycode vs uCalculator

The clearest difference is price: Graycode at $2.99 against uCalculator's $4.99. uCalculator's advantage is iOS requirement (9.0 vs 12.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Graycode costs $2.99 and uCalculator $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Graycode ships an update every 10 months, uCalculator every 13 months. The most recent releases landed on August 26, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Graycode | uCalculator |
| --- | --- | --- |
| Price | **$2.99** | $4.99 |
| 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 | No |
| Update frequency | **Every 10 months** | Every 13 months |
| Monetization | Paid | — |
| Size | 2 MB | 1 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) | [伟锋 阮](https://appshunter.io/developer/994270912) |

## 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


### uCalculator

[App page](https://appshunter.io/ios/app/ucalculator/id1471865233)

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

**In-app purchases:** none


## Frequently asked questions

### Is Graycode free?

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

### Is uCalculator free?

uCalculator costs $4.99, with no in-app purchases.

### Do Graycode or uCalculator have ads?

Neither Graycode nor uCalculator shows ads.

### Which is updated more often, Graycode or uCalculator?

Graycode ships an update every 10 months, and uCalculator every 13 months. Most recently, Graycode was updated on August 26, 2026 and uCalculator on September 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*