Solle

The aim is a brain-training habit that fits into a few minutes a day and does not punish you for missing one. It works without a signal and keeps personal data on the phone.

Each day Solle serves a fresh session drawn from puzzle types including sudoku, nonograms, number targets, sequences, estimation, mental arithmetic, memory recall and vocabulary. Puzzles are generated rather than hand-picked, so the pool does not run dry. Before playing there is a quick check-in on movement, rest and time outside, and with permission yesterday's figures can fill in from Apple Health.

A guided self-reflection section is in development alongside the puzzles.

Solle is built with React Native and TypeScript on Expo, with an on-device database. Small fixes reach testers as over-the-air updates, without a new install.