ChessUnlock places a chess tactics puzzle between you and your Mac desktop each time you wake the machine. The app applies the habit-stacking technique—attaching a new behavior to an existing action—using the daily Mac unlock as a trigger for consistent chess practice.
The puzzle library draws from the Lichess open database of over five million positions sourced from real games, the same collection used by competitive players worldwide. Each puzzle is assigned a difficulty rating, and ChessUnlock selects problems that match your current Elo so sessions stay in an appropriate challenge zone without requiring manual configuration. The rating system spans from 600 to over 2400, accommodating beginners through advanced players.
Streak tracking records consecutive days of puzzle completion, providing a lightweight accountability mechanism without requiring separate app-based reminders or calendar entries. Puzzles typically take 5–10 seconds to solve, keeping the friction low enough that the habit can survive even rushed mornings. Progress persists across sessions, allowing the Elo estimate to stabilize over time.
System requirements: Compatible with macOS. Exact minimum macOS version not publicly specified; check chessunlock.app for current compatibility details. No notable permissions beyond standard app access are required.
Pricing: Free to download with trial included. See chessunlock.app for current pricing details.
Limitations: The app is macOS-only with no iOS companion. Puzzle types are limited to standard chess tactics; no variants (960, antichess, puzzleRush-style sessions) are supported. Users who prefer to control when they practice rather than being interrupted at unlock may find the trigger model intrusive.
Alternatives: Lichess.org (free, browser and app, offers a full tactics trainer with the same puzzle database and no unlock trigger); Chess.com (freemium, includes a Puzzle Rush mode on web and iOS/Android); the macOS built-in Chess app (provides game play against the engine but no structured tactics training).
Suitable for users who want to build a chess tactics habit without dedicating scheduled practice time, leveraging the daily Mac unlock as a low-effort trigger.
