Sudoku Lens - AI Camera Solver vVARY

Stuck on a Sudoku? Point your camera and let Sudoku Lens solve it instantly.

Sudoku Lens brings powerful computer-vision + AI to your pocket — scan any 9×9, 6×6, 4×4 Sudoku (even handwritten) and get instant results. Choose to save or share the solved puzzle. Perfect for checking answers, hobbyists, and anyone who loves Sudoku.

Built for speed and privacy using on-device lightweight PyTorch digit model and Algorithm X (Dancing Links) solver for fastest, reliable solutions.

How it works (simple):
1. Detect the Sudoku grid using OpenCV contour detection and perspective transform.
2. Extract 81 cells, preprocess, and run a CNN classifier to read digits.
3. Solve the puzzle using an exact cover algorithm (Algorithm X / Dancing Links).
4. Overlay the solution on the original frame and let you save/share the result.

Key features & benefits:
• No manual entry — scan & solve with Camera conveniently.
• Work offline & protect privacy — all image processing and inference run on-device, so your data never leaves your phone.
• Ultra-fast solver — Algorithm X (Dancing Links) is one of the fastest if not the fastest algorithm for solving Sudoku puzzles.

Permissions & safety
• Camera — required to scan puzzles.
• Storage / Media — optional, for saving solved images.
• Internet connection — optional, for displaying ads.
No personal data is collected. Images stay on your device unless you intentionally save or share them through your phone’s standard sharing menu.

Developer Note
This app is built by a solo hobbyist exploring computer vision, machine learning, and puzzle algorithms. Your feedback and bug reports help improve the app — thank you for supporting!

The source code for the app is publicly available on my GitHub for learning and transparency. You can explore how the app works, how data is processed on-device and the pipelining etc.