First Thought
Short thinking exercises for an e-ink notebook.
Why I built it
I wanted to use the notebook for more than taking notes. I made a few short calculation and memory exercises that I could do with the pen.
How it works
Quick Calculations lets me write answers by hand, with recognition running on the device. Flash Grid is a short memory exercise: remember a pattern, then recreate it.
Both work offline, with a short daily set and simple feedback. The app handles pen input and e-ink refreshes separately so writing stays responsive. Scores track exercise results, not cognitive ability.