Which hand are you using?

Planned: live version in progress

Illustration drawn by code: swipes curve the other way for each hand, taps sit on the thumb side, and the phone tilts toward the hand.

Tap and swipe a few times on your phone and the page guesses which hand holds it: the first signal in telling users apart by behaviour. Rebuilt from scratch with public techniques.

Not live yet. The animation above shows what the demo does. The live version is being built and will be linked here when it is ready.