Problem solved

Printed Sudoku solvers often need to manually transcribe clues or solve every cell when verifying an answer, which is slow and error-prone. Squoku uses the iPhone or iPad camera to scan the printed grid on-device, allowing users to verify the detected clues and view the solution without uploading the puzzle or solving it by hand.

Use cases

• Scan a printed Sudoku from a newspaper or puzzle book and reveal its solution.
• Verify a partially completed Sudoku before finishing it manually.
• Check mistakes in a printed puzzle solution without transcribing the grid.
• Solve Sudoku puzzles privately on an iPhone or iPad with on-device processing.
• Save solved puzzles in local history for later reference.
• Use the app as a companion for casual printed puzzle books or competition practice.

Audience

• Hobbyists

Pros

• On-device scanning and solving, with no account or puzzle upload.
• Lets users verify detected clues before solving.
• One-time purchase option instead of a subscription.
• Keeps solved puzzles in local history.
• Designed specifically for printed Sudoku on iPhone and iPad.

Cons

• Only available on iOS via the App Store, not Android or web.
• Requires an in-app purchase after the first two solutions.
• No GitHub repository or open-source code available.
• Scanning accuracy depends on image quality and puzzle print clarity.
• No desktop or browser-based scanner is mentioned.