Carry a message in color and shape.

Generate here. Scan from another screen or a print. Everything runs on your device.

ENCODE

Make a code

Message

Correction

Export size

Encrypt with a passphrase

DECODE

Keep the whole code and white margin in view. Move close enough to see the patterns.

Camera is off

Decoder options

Confidence-guided correction Spare-cell equations Neighboring-cell correction Sampling refinement Fuse up to eight camera frames

Ready to scan

Live camera access needs HTTPS or localhost. On a phone, use an HTTPS host. Image files stay on the device.

The 19-symbol alphabet