decimen-optical-transfer
Beams a file or text to another device's camera as flashing light — no network link needed.
Decimen displays a file or block of text on one screen as optically encoded light, and another device's camera reads it back — no account, pairing, cloud storage, or network path between the two devices. It handles files up to 64 MB or text snippets up to 4 MB, compressing when it helps and restoring the original filename. It's free and open source, no ads.
What holds up
- +Free and open source, no ads — nothing to pay or unlock
- +No network path needed between devices — works where Wi-Fi and Bluetooth can't reach
- +Handles files up to 64 MB or text up to 4 MB, restoring the original filename
Mind the limits
- −Files aren't encrypted — anything on the sending screen is readable by any camera pointed at it
- −Needs a direct line of sight between screen and camera, by how the transfer works
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