Offline by design
PrismShare sends files between screens and cameras using colour codes. No network. No pairing. No accounts.
When the network is unavailable, untrusted or simply unnecessary, the screen becomes the sender and the camera becomes the receiver.
How it works
A deliberately simple path from one device to another.
Any file: a note, a key, a document, a photo. PrismShare fountain-codes it into PS Codes, colour symbols that each carry three QR planes at once, and plays them as a loop on your screen.
Measured on real phones: 4.9 kB per second sustained, so a typical document crosses in seconds and a megabyte takes about four minutes.
The receiving phone needs only its camera. It calibrates to your screen's colours using the ring around each code, then reads more than six symbols a second.
Miss the start, look away, come back: fresh repair pages keep flowing, so any lap of the loop completes the file. The sender never needs to know you are there.
The finished file lands in your Downloads, checksum verified byte for byte, and opens or shares like anything else on the phone.
Nothing was uploaded, because nothing was connected. No radio, no server, no account, and the app cannot even ask for the network.
Try it right now
Install PrismShare, open the Scan tab and point your phone at any of these. Go fullscreen, get close so the codes fill your screen, and keep both squares in view.
The technology
PrismShare does not pretend the sender can hear the receiver. Its protocols are designed around that constraint.
Stacks standard QR planes across colour channels, surrounded by a calibration ring that helps a camera correct the captured light. Around 5.6 times the data of a QR code in the same area.
Rateless repair pages keep flowing. A receiver can join late, miss frames and still reconstruct the complete file without a return channel.
A low-latency transport profile for live media, using a moving redundancy window rather than complete-file fountain recovery. Tested through real phone cameras: a screen speaks, and the phone plays the voice as it arrives.
Privacy is structural
The Android app is designed without network permission. Camera frames are decoded on-device and discarded; files are stored only where you save them.
Read the privacy policyGet PrismShare
The Android app is in closed testing on Google Play, the desktop apps are ready to download, and the PS Code specification is open for anyone to implement.
Install steps and SHA-256 checksums live on the Downloads page.
Closed testing
Early builds, strange experiments, and a direct line to the developer. Leave the address you use on Google Play and the invite comes to your inbox.
Use the address your phone's Google Play account uses. That is all we need.
One field, one purpose. The address lives on our server, brings you the invite and test updates, and is never shared. Privacy.