Sudoku Photo Solver & Learn

Scan a sudoku from a photo and solve it yourself — with hints that teach instead of spoiling.

Most sudoku solvers hand you the answer. This one hands you the next move, explains why it works, and then asks you to make it.

SCAN ANY SUDOKU
Photograph a puzzle from a newspaper, a book or a screen, or point the camera at it. Recognition runs entirely on your device: the photo never leaves your phone and never reaches a server. No account, no sign-in, no internet needed. You can also type a puzzle in by hand or paste it as text.

HINTS THAT TEACH, NOT SPOIL
Every hint is a ladder, not an answer. It shows you the area to look at, names the technique, highlights the candidates the logic depends on — and on the last rung asks which digit belongs in the cell. Stop at any step. The answer is always the last one, never the first.

A HANDBOOK OF 32 TECHNIQUES
Full house, crosshatching, hidden and naked singles, pointing and claiming candidates, naked and hidden pairs, triples and quads, X-Wing, Swordfish, Skyscraper, Two-String Kite, Empty Rectangle, Simple Colouring, XY-Wing, XYZ-Wing, W-Wing, Unique Rectangle, BUG+1, Finned X-Wing, X-Chain, XY-Chain, AIC, 3D Medusa, ALS-XZ, Sue de Coq, forcing chains and Kraken. Every technique comes with theory, a walkthrough on a live board and a drill to practise it.

SKILLS THAT OPEN AS YOU MEET THEM
The learning tree unlocks a technique when a real puzzle needs it — not as a course you have to grind through before you are allowed to play.

PLAY, NOT ONLY SOLVE
Four difficulties, graded by the techniques a puzzle actually requires rather than by how many digits are missing. Corner pencil marks with a fixed place per digit — 1 top-left, 9 bottom-right — a check mode that finds wrong digits and impossible notes, unlimited undo.

MADE TO BE READ
Large, high-contrast pencil marks. A digit pad you can reach with one thumb. Digit-first input for filling one number across the board. Five themes including dark. The screen stays awake while you think.

Works offline. No account, no sign-up. Available in 30 languages.