OffChess

OffChess is built around a single premise: chess puzzles should work everywhere, all the time, with no internet required. The app ships with 100,000+ tactical puzzles ranging from beginner-level one-movers to complex multi-move combinations, all stored locally on your device so you can train on a plane, in a subway, or anywhere else without Wi-Fi.

The puzzle set adapts to your level as you solve. Get a few right in a row and the difficulty climbs. Miss a few and it recalibrates, keeping you in the sweet spot between challenge and progress. Your stats, streak counts, and puzzle history all live on-device too, so there are no accounts to create and no data to sync.

One of the sharpest parts of the experience is the business model: no subscriptions, no ads, no in-app purchases. A single one-time payment unlocks the full library. The developer built OffChess out of frustration with puzzle apps that require constant connectivity or bombard you with notifications and upsells. The result is something rare in the app ecosystem: a clean, focused tool that just works.