Scan the Sudoku
Hold your iPhone over the puzzle. SudoFlash finds the 9×9 grid and reads the printed digits.
Your Sudoku assistant
Crack every Sudoku.
Point your camera. Check the digits. Understand the next logical move. SudoFlash turns your printed puzzle into a clear digital board.
Local-first AICore scanning and Sudoku logic work offline on your iPhone
For iPhone · iOS 18 or later
Three quick moves
From paper to the aha moment.
SudoFlash recognises printed puzzles, lets you verify the scan and explains the next logical move without taking the puzzle away from you.
Check the reading
Correct uncertain or misread cells before you continue.
Understand the logic
A hint reveals exactly one move and explains why the digit belongs there.
Clear help, not guesswork
Your puzzle stays your puzzle.
Choose how much help you want: one logical hint, one selected cell or the complete solution.
One step at a timeMove backwards, forwards or play automatically at your pace.
Recognition stays editableReview and correct every recognised digit.
History on your deviceFinished scans remain stored locally on your iPhone.
SudoFlash in action
A fighter for clear thinking.
Our Sudoku fighter handles the drama. You keep control of the puzzle.
Scan
Grid in sight.
The scanner detects your printed puzzle and transfers the digits into the game.
Hint
The one clear move.
One cell. One digit. One understandable reason.
Private by design
Your camera. Your puzzle. Your device.
Core grid detection, digit recognition and Sudoku logic run on your iPhone. Full camera images, recognised puzzles and puzzle history stay on your device.
- Core scanning and Sudoku logic work offline
- No advertising trackers; difficult isolated digits may use Apple Private Cloud Compute
- Full photos and puzzle history stay on your device
In short
Questions before you start?
The essentials about scanning, privacy and release.
Where can I download SudoFlash?
SudoFlash is available in the Apple App Store for iPhone and iPad. Use the download button on this website.
Which puzzles can SudoFlash read?
It is optimised for clearly visible printed 9×9 Sudoku on paper or a screen.
Does SudoFlash work without internet?
Yes. Core grid detection, digit recognition and Sudoku logic work offline. On compatible iOS 27 devices, SudoFlash may use Apple Private Cloud Compute for a small number of difficult printed digits when a network is available.
Do I need an account?
No. Your scanned puzzles are stored locally on your device.
Ready for the next move?
SudoFlash is available for iPhone and iPad. Download it now from the Apple App Store.
Download on the App Store