ChessUnlock

A chess puzzle every time you unlock your Mac. 5M+ tactics from Lichess, adaptive Elo rating, streak tracking. Improve at chess passively. macOS app.

Every time you wake your Mac, a puzzle appears. You already unlock your Mac dozens of times a day. ChessUnlock turns an action you can't skip into practice you'll never forget. Instead of your desktop, a chess tactic appears fullscreen. Puzzles match your rating - always challenging, never impossible. You improve passively, every single day. Habit stacking - attaching a new behavior to an existing trigger - is one of the most effective ways to build lasting habits.