Sudoku Harmonic vs Sudoku Note
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Sudoku Harmonic
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.
- Solfeggio frequencies mapped to numbers
- Harmonious layered audio feedback
- Minimalist interface
- Multiple difficulty levels
- Customizable sound and visuals
- Light and dark modes
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This is Sudoku, reimagined as a gift for your senses. Sudoku Harmonic transforms the classic puzzle you love into an immersive sonic experience. Each number (1 - 9) plays its own Solfeggio frequency (174 Hz – 963 Hz), turning every move into a moment of sound that draws you deeper into focus and flow. This is the puzzle game you'll actually want to keep playing - not out of habit, but because it feels genuinely uplifting. Why players are hooked: - The audio creates a calming, satisfying rhythm as you solve - You naturally enter a state of relaxed concentration - Time passes differently—you're present, not anxious - It's mentally engaging without being draining - You finish sessions feeling centered, not depleted What makes it different: Each number triggers a specific Solfeggio tone, creating a harmonic soundscape as you play. The experience supports relaxation, mental clarity, and mindful focus - making this a puzzle game that actually enhances your state of mind rather than just filling time. Features: - Solfeggio frequencies (174 Hz - 963 Hz) mapped to each number - Beautiful, minimalist interface - Multiple difficulty levels for all skill levels - Harmonious, layered audio feedback - Customizable sound and visual settings - Light and dark modes - Clean, distraction-free design Perfect for: - Sudoku enthusiasts ready for an evolution of the classic game - Meditation and mindfulness practitioners - Anyone curious about frequency and sound experiences - People who want mental exercise that feels restorative - Those seeking a genuinely calming daily ritual Put on your headphones. Take a breath. And discover why this might become the most uplifting part of your day. Welcome to Sudoku Harmonic - where the game you love meets the frequencies that elevate it.
Sudoku Note
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.
- Handwritten number input
- Apple Pencil support
- Handwriting recognition
- Step-by-step puzzle difficulty
- Detailed solving technique explanations
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Writing something by hand can feel a little inconvenient, yet strangely satisfying. Sudoku Note lets you write, erase, and take notes using Apple Pencil (or your finger), so you can enjoy Sudoku calmly, just like on paper. Instead of tapping a number pad, you simply write numbers, and handwriting recognition does the rest. Puzzles are not random. They are carefully designed with step-by-step difficulty based on solving techniques. Every puzzle includes a detailed explanation along with the solving techniques. Experience a different kind of Sudoku.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Sudoku Harmonic | Sudoku Note |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 3.5 (2 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 | 2 |
| Update frequency | Every 2 days — better | Weekly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 5 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | Qi Machine LLC | Eunjeong Im |
Customer experience
Sudoku Harmonic
Sudoku Note
In-app purchases
Sudoku Harmonic
No in-app purchases
Sudoku Note
- Sudoku Note I$3.99









