MorseLightCrypt

Send text as Morse code with the flashlight or as beeps, and read it back with the camera or the microphone, optionally encrypted with a master password.

One phone flashes or beeps, another one watches the light or listens and turns the pulses back into text. It also reads any other blinking light (a lamp, a screen, a torch in the distance) and any Morse tone (a radio, a computer, another phone, an instrument).

• Send: type, pick the speed, choose light, sound or both, and send. Repeat in a loop so the receiver has time to get settled.
• Receive: choose light or sound signal and press Start. Pinch to zoom on distant lights; by ear it finds the sender's pitch by itself. Each repeat lands on its own line, and the received text can be edited by hand.
• Encrypt / Decrypt: AES-256 with a master password, in a compact format of letters and digits made for Morse: "HOLA MUNDO" becomes 26 characters.

The receiver follows only what blinks, so a bright screen next to the lamp does not blind it, and by ear it follows only the Morse tone, not the noise around it. It measures the sender's speed by itself, tolerates a hand holding the phone and pauses while the phone moves.

No network permission: nothing leaves the phone except light and sound. The microphone is open only while receiving by sound, and nothing is recorded or stored.

Sending by light needs a phone with a flashlight; receiving needs a camera or a microphone.

Available in English, Spanish, Portuguese, French, German, Italian, Dutch, Polish, Russian, Ukrainian, Chinese, Japanese, Korean, Thai and Hindi.