SudoLens

Scan, play and learn sudoku on iPhone, iPad and Mac

Frequently asked questions

The camera doesn't find the grid

Lay the page flat in good light and hold the phone so the whole grid, with its outer border, is in view. The outline appears once SudoLens finds the grid, and the photo is taken when you hold still. You can also take the photo yourself with the shutter, import a photo you already have, or enter the puzzle by hand.

A digit was read wrong

After a scan, SudoLens shows the digits it read before you play; switch to Photo to compare them with the grid you scanned. Select a cell and enter the right digit. Later you can still fix the givens with Edit givens in the library.

How do hints work?

A hint shows the next logical step on the board and explains it, without filling in the answer. Each hint links to the lesson for its technique.

How hard is a puzzle?

Analyze solves the puzzle the way a person would and gives its level, from Easy to Extreme, with the hardest technique it needs. The solution path stays hidden until you ask for it.

My puzzles don't appear on my other devices

Sync uses your own iCloud. Check that each device is signed in to iCloud with the same Apple Account, and that iCloud sync is on in SudoLens's Settings, which also shows when it last synced. Changes usually arrive within moments while the app is open.

Do I need to buy it again for my Mac or iPad?

No. One purchase covers SudoLens on iPhone, iPad and Mac.

How do I delete my data?

Swipe a puzzle in the library to delete it. To remove everything SudoLens keeps in iCloud, go to Settings → [your name] → iCloud → Manage Storage on your iPhone or iPad, or System Settings → [your name] → iCloud → Manage on a Mac, and delete SudoLens's data.

Does SudoLens collect my data?

No. There's no account, no advertising and no tracking, and everything runs on your device. See the privacy policy.