Corvyn
An offline abstract-reasoning trainer. No account, no sign-in, no network requests of its own, and no analytics. Everything it records about you stays on your device.
What it does
Corvyn generates matrix-reasoning puzzles — the kind built from progressions, rotations and logical rules — and drills them. Practice mode names the rule the moment you answer. Challenge mode is a timed adaptive run that places you on an ability scale. Progress, per-rule mastery and a daily streak are tracked locally.