Comparison

Sudoku Harmonic vs Sudoku Note

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Solfeggio frequencies mapped to numbers
  • Harmonious layered audio feedback
  • Minimalist interface
  • Multiple difficulty levels
  • Customizable sound and visuals
  • Light and dark modes
Features
Read full description

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.

About

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.

Highlights
  • Handwritten number input
  • Apple Pencil support
  • Handwriting recognition
  • Step-by-step puzzle difficulty
  • Detailed solving technique explanations
Features
Read full description

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

Sudoku Harmonic4 screens
Sudoku Note4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Sudoku Harmonic versus Sudoku Note: the parameters behind the verdict, then further details
ParameterSudoku HarmonicSudoku Note
PriceFreeFree
Rating5.0 (2 ratings) — better3.5 (2 ratings)
Positive reviews100.0% of reviews—
Number of ratings22
Update frequencyEvery 2 days — betterWeekly
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.6 — better26.0
Further details — not scored
Size5 MB46 MB
Age rating4+4+
DeveloperQi Machine LLCEunjeong Im

Customer experience

Sudoku Harmonic

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Sudoku Note

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Sudoku Harmonic

No in-app purchases

1 purchases

Sudoku Note

One-time1
  • Sudoku Note I$3.99

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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