Magical Share

Magical Share sends a file as a stream of QR codes that the receiving device reads with its camera. It works with no network at all: no Wi-Fi, Bluetooth, cable or account. A fountain code lets the receiver join at any time and miss frames. Key mode (X25519 + ChaCha20-Poly1305) means only the receiving phone can open the file, and both screens show a check number. The Android app has no internet permission, and there are no analytics. Free to receive; sending is a 7-day trial and then a one-time US$3.99. Android, Mac and a free web sender; iPhone coming.