Send any file between two phones using nothing but their screens and cameras.
One device flashes QR codes; the other reads them and flashes back what it still needs.
The link tunes itself — frame rate first, then code density, then tiling — until it finds the fastest rate that stays error-free.
File to send
Camera
01 Pick a file and tap Send on one phone; tap Receive on the other. 02 Prop the phones so each camera sees the other's screen. 03 It starts slow for a clean lock, then ramps up on its own. Watch the optimizer readout. 04 When every unit lands, the receiver offers the rebuilt file to save.
—searching
SCAN
Aim this camera at the other phone's screen. Keep both screens fully in view — nothing should cover the codes.