Every shared-album app dies at the same step: “download our app to see the photos.” By the time a guest has found the app store, waited for the install, and made an account, the moment is gone and so is their patience.
Roll's guests never touch an app store.
Point a phone at the QR code on the table. A camera opens in the browser. Type a name so the host knows who's who. Start shooting. That's the entire flow, and it clocks in around twelve seconds, most of it spent typing the name.
The camera that gets used is the one that's already in your hand and already open.
Modern phone browsers can open the camera, capture full-quality frames, and upload them without a single install. For a guest who's only shooting one roll one night, that's exactly the right amount of software: none.
The Roll app is for hosts (the people opening rolls, setting the rules, and choosing when the night unseals) and for anyone who wants face match delivery. Guests who just want to shoot never need it. Two doors, and everyone walks through the one that fits.