Train: Your cases
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Statuses: Not learned, Learning, Learned. "Learned" means an interval of three weeks or more, or marked by hand.
Smart cube
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Bluetooth cubes need Web Bluetooth (Chrome or Edge on a computer or Android); the iOS app does not support them yet.
Keys: space reveals, 1–4 grade (Again, Hard, Good, Easy). A smart cube's first turn also stops the recognition clock.