# Sudoku Harmonic vs Gravity Sudoku

The clearest difference is in-app purchases: Sudoku Harmonic at none against Gravity Sudoku's 1. Sudoku Harmonic also leads on iOS requirement (18.6 vs 26.0). On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Sudoku Harmonic against 5.0 for Gravity Sudoku. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Sudoku Harmonic ships an update every 2 days, Gravity Sudoku daily. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sudoku Harmonic | Gravity Sudoku |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/sudoku-harmonic/id6755743522/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/gravity-sudoku/id6762402930/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 days | **Daily** |
| Monetization | Free | Free |
| Size | 5 MB | 3 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) | [Andrew Everett](https://appshunter.io/developer/1894044372) |

## 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


### Gravity Sudoku

[App page](https://appshunter.io/ios/app/gravity-sudoku/id6762402930)

A distraction-free Sudoku game offering classic logic puzzles with unique social features. Challenge friends to beat your times or get human hints when stuck. Enjoy five difficulty levels with an optional one-time upgrade.

**Highlights:** Human hints for stuck cells, Race friends' ghost times, Five difficulty levels, Candidate notes and reasoning workspace, Input coach for explanations, No ads or subscriptions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gravity Plus | $0.99 | one-time |


## Frequently asked questions

### Is Sudoku Harmonic free?

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

### Is Gravity Sudoku free?

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

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

Sudoku Harmonic and Gravity Sudoku are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

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

Neither Sudoku Harmonic nor Gravity Sudoku shows ads.

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

Sudoku Harmonic ships an update every 2 days, and Gravity Sudoku daily. Most recently, Sudoku Harmonic was updated on November 5, 2026 and Gravity Sudoku 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.*