# Sudoku Harmonic vs Sudoku Note

The clearest difference is rating: Sudoku Harmonic at 5.0 against Sudoku Note's 3.5. Sudoku Harmonic also leads on in-app purchases (none vs 1) and update cadence (every 2 days vs weekly). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Sudoku Note sells 1 one-off in-app purchase. Sudoku Harmonic asks for nothing beyond the download.

Sudoku Harmonic holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

Sudoku Harmonic ships an update every 2 days, Sudoku Note weekly. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sudoku Harmonic | Sudoku Note |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sudoku-harmonic/id6755743522/reviews)** | [3.5 (2 ratings)](https://appshunter.io/ios/app/sudoku-note/id6757120330/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Weekly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 5 MB | 46 MB |
| Requires iOS | **18.6** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Qi Machine LLC](https://appshunter.io/developer/1249045808) | [Eunjeong Im](https://appshunter.io/developer/1530216032) |

## What reviewers say

### Sudoku Harmonic

[App page](https://appshunter.io/ios/app/sudoku-harmonic/id6755743522)

Experience Sudoku like never before with a unique sonic twist. Each number corresponds to a Solfeggio frequency, creating a calming and immersive audio experience that enhances focus and relaxation. It's a mentally engaging puzzle game designed to leave you feeling centered and uplifted.

**Highlights:** Solfeggio frequencies mapped to numbers, Harmonious layered audio feedback, Minimalist interface, Multiple difficulty levels, Customizable sound and visuals, Light and dark modes

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

**In-app purchases:** none


### Sudoku Note

[App page](https://appshunter.io/ios/app/sudoku-note/id6757120330)

Enjoy Sudoku with a paper-like experience using your finger or Apple Pencil. This app features handwriting recognition for input and puzzles designed with step-by-step difficulty explanations.

**Highlights:** Handwritten number input, Apple Pencil support, Handwriting recognition, Step-by-step puzzle difficulty, Detailed solving technique explanations

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sudoku Note I | $3.99 | one-time |


## Frequently asked questions

### Is Sudoku Harmonic free?

Sudoku Harmonic is free to download, with no in-app purchases.

### Is Sudoku Note free?

Sudoku Note is free to download, with in-app purchases available.

### Which has better reviews, Sudoku Harmonic or Sudoku Note?

Sudoku Harmonic is rated higher. Sudoku Harmonic averages 5.0 out of 5 from 2 ratings, while Sudoku Note averages 3.5 from 2 ratings.

### Do Sudoku Harmonic or Sudoku Note have ads?

Neither Sudoku Harmonic nor Sudoku Note shows ads.

### Which is updated more often, Sudoku Harmonic or Sudoku Note?

Sudoku Harmonic ships an update every 2 days, and Sudoku Note weekly. Most recently, Sudoku Harmonic was updated on October 24, 2026 and Sudoku Note on October 31, 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.*