# Calm Sudoku · 静心数独 — No ads ever. Large-print.

> No ads ever. Large-print. (iPhone/iPad app by Yishu Gu.)

- Source: https://appshunter.io/ios/app/calm-sudoku/id6761793567 (this page in markdown: same URL + `.md`)
- Developer: [Yishu Gu](https://appshunter.io/developer/1891227083)
- Category: Games, Casual, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 24 MB
- Languages: American English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Estonian, Finnish, French (France) and 24 more
- Released: 2026-05-08
- Data updated: 2026-09-07
- User reviews in markdown: https://appshunter.io/ios/app/calm-sudoku/id6761793567/reviews.md

## What is Calm Sudoku · 静心数独?

Calm Sudoku is a quiet, ad-free sudoku app built for everyday focus and unwinding. It is comfortable for first-time solvers, longtime sudoku fans, and anyone who wants a cleaner, easier-to-read puzzle experience.

No ads. Not now, not later. The free experience is calm by design.

WHAT'S INSIDE
• Daily Puzzle: one fresh sudoku every day
• Four difficulty levels: Easy, Medium, Hard, and Expert with Premium
• Smart hints: see the logic, not just the answer
• Notes mode: pencil in candidates with one tap
• Auto-save: leave and continue any puzzle later
• Personal stats: best times, streaks, and weekly activity
• Localized interface in 35 supported languages
• Large, readable numbers with calm color themes
• Offline play: puzzles and progress stay on your device

DESIGNED FOR COMFORT
Calm Sudoku is made to be readable in low light, gentle on the eyes, and forgiving when you tap the wrong cell. The board uses generous spacing, clear contrast, and large digits so you can focus on the puzzle instead of the interface.

CALM SUDOKU PREMIUM
A one-time, no-subscription unlock adds:
• Expert difficulty
• 2,000+ additional puzzles
• Unlimited hints
• Advanced statistics

Premium is a single purchase. No subscription. No auto-renewal.

PRIVACY
Calm Sudoku does not collect, store, or transmit personal data. No account, no analytics, no tracking. Progress stays on your device.

Questions or feedback? Email team.emitu@gmail.com.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Calm Sudoku Premium | $4.99 | one-time |



## Version history (last 5 releases)

### 1.2.2 — 2026-09-06

Improved the Daily Puzzle schedule so each day continues to advance reliably over the long term. We also greatly expanded the built-in daily puzzle collection.

### 1.2.1 — 2026-08-31

Fixed an issue that could cause Today’s Puzzle to repeat on consecutive days. Daily puzzles now advance correctly based on the current date.

### 1.2.0 — 2026-08-11

Expanded the interface to 35 supported languages and refreshed localized App Store information. Gameplay and core features are unchanged.

### 1.1.2 — 2026-07-26

We improved the Notes feature.

When you enter a correct number, matching notes are now automatically cleared from the same row, column, and 3×3 box.

A heartfelt thank-you to the user who brought this issue to our attention. Your feedback helped make Calm Sudoku easier to use.

### 1.1.1 — 2026-07-20

Added more language support for European players. Gameplay and core features are unchanged.

## More apps by Yishu Gu

- [CardBrain - Benefit Tracker](https://appshunter.io/ios/app/cardbrain-benefit-tracker/id6761742264)
- [Fruit Picker AI](https://appshunter.io/ios/app/fruit-picker-ai/id6780331946)

All apps by Yishu Gu: https://appshunter.io/developer/1891227083

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*