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Very cool, how are you able to get the information necessary to load the apps with this level of accuracy?

Gestures/drawings are matched to app/bookmarks using a finely tuned multi-stroke gesture recognition library I wrote (https://github.com/mhuusko5/Cocoa-Multistroke-Gesture-Recogn...). This uses a tweaked implementation of the $N (golden section search variant) recognition algorithm (https://depts.washington.edu/aimgroup/proj/dollar/ndollar.ht...).