doku.su: Sudoku Coach
Hints that explain every move
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
The moment Sudoku finally starts to click.
Learn all the moves with your personal coach.
Sudoku Coach is a calm place to learn the rules, practice solving methods, and work through real puzzles without guessing. Every hint begins with valid Sudoku logic and reveals only as much as you ask for.
START AS A COMPLETE BEGINNER
• Learn what a row, column, and 3 × 3 box mean.
• See one ordinary-language explanation before the official technique name.
• Follow short worked examples, then try the same idea yourself.
SOLVE WITH A COACH
• Ask for a clue from your current grid.
• Reveal the reasoning one step at a time.
• Explore explanations grounded in the rules and position of your puzzle.
• Keep solving offline; coached replies and sync return when you reconnect.
BUILD LASTING SKILL
• Practice scanning, single-candidate moves, hidden placements, candidate notes, pairs, and advanced patterns.
• Review mistakes from the exact position where they happened.
• Track learning evidence, not just puzzle completion.
• Continue on another device with an optional account.
FREE INCLUDES
• A daily puzzle
• Unlimited undo
• Beginner lessons
• Full coaching until your first coached success
• One support thread on each later puzzle
• Basic progress tracking
COACHING SUBSCRIPTION
Coaching unlocks unlimited puzzles and support, advanced and full-grid Guided solve, every proof replay, the full lesson library, personalized practice, spaced mistake review, and full progress history.
The monthly price is shown before purchase and may vary by region. Payment is charged to your App Store account. The subscription renews automatically unless cancelled in App Store settings at least 24 hours before the end of the current period. Cancelling stops renewal while keeping access through the verified paid end date. A verified billing grace period keeps access through its end. If a payment cannot be collected without grace, or the subscription expires or is revoked, access ends. A refund record alone changes access only if Apple also ends or revokes the subscription. Restore purchases with the same Sudoku Coach account and wait for server verification, then manage the subscription from Account inside the app. Deleting the Sudoku Coach account does not cancel App Store billing.
Privacy: https://doku.su/privacy
Terms: https://doku.su/terms
Support: https://doku.su/support
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Photo import is more responsive, and account deletion handles background sync more reliably. This update also improves first-party acquisition measurement and updates the privacy information.
The developer, Julien Bouisset, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Julien Bouisset
- Size
- 42.3 MB
- Category
- Education
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and French
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Coaching $4.99
- Copyright
- © 2026 doku.su