# Graycode vs Notebook Calculator

The clearest difference is review sentiment: Notebook Calculator at 100% against Graycode's 67%. Notebook Calculator also leads on chart position (#191 vs unranked) and price ($1.99 vs $2.99). Graycode's advantage is update cadence (every 10 months vs every 40 months) and iOS requirement (12.0 vs 15.6). On ads, in-app purchases, monetization model and device support there is nothing between them.

Graycode costs $2.99 and Notebook Calculator $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Graycode ships an update every 10 months, Notebook Calculator every 40 months. The most recent releases landed on August 26, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | Graycode | Notebook Calculator |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/graycode/id548428653/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 40 months |
| Monetization | Paid | Paid |
| Best chart rank | — | **#191** |
| Size | 2 MB | 4 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) | [俊 姜](https://appshunter.io/developer/974809005) |

## 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


### Notebook Calculator

[App page](https://appshunter.io/ios/app/notebook-calculator/id1169182532)

**Currently charting:** #191 Top Paid · Utilities (US App Store)

This app functions as a powerful calculator with a notebook interface, allowing users to write, edit, save, and graph complex calculations. It supports a wide range of mathematical and statistical functions, including scientific and complex number calculations, with features like copy, cut, and paste for easy editing.

**Highlights:** Notebook interface for calculations, Edit, save, and graph history, Scientific and graphic calculator functions, Complex number calculations, Extensive mathematical functions, Statistical functions, File management for calculations

**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 Notebook Calculator free?

Notebook Calculator costs $1.99, with no in-app purchases.

### Do Graycode or Notebook Calculator have ads?

Neither Graycode nor Notebook Calculator shows ads.

### Which is updated more often, Graycode or Notebook Calculator?

Graycode ships an update every 10 months, and Notebook Calculator every 40 months. Most recently, Graycode was updated on August 26, 2026 and Notebook Calculator on September 4, 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.*