Native application for iPhone

Klu

One puzzle a day.
The same for everyone.

Symbols to place, cards that say where. One arrangement satisfies every card, and it is always reached by deduction — never by guessing.

In development

iOS 26+

Features

Like a daily crossword. The week climbs from Monday, solved in two minutes, to Sunday, which asks for some forty chained deductions.

Every puzzle is verified before it ships: one unique solution, reachable by pure deduction. If you are stuck, a deduction exists.

Clues are drawn cards, not sentences. Seven families, one grammar you learn in five minutes — and it reads in any language.

Stuck? A lightbulb unfolds the reasoning one step at a time: what follows, the card that allows it, the rule that applies.

VoiceOver reads every card aloud. Dynamic Type supported. Colour never carries meaning — symbols are told apart by their silhouette.

Private data

Klu has no account, no advertising, no in-app purchase and no tracker.

Your current game, your streak and your progress stay on the device.

Two years of puzzles ship inside the app, which makes no network request.

See our full privacy policy for details.

Support

Write to us with any question about the game, or to report an issue.