Each pane renders the site at its true viewport, then scales it to fit. All outputs come from brief v1.1.0 under the same protocol, so they form one comparison group. Up to 5 panes fit side by side, and the same output may fill more than one.

Scrolling in Interactive mode is synced across panes. Each page moves the same distance; shorter pages stop while longer pages continue. Turn scroll sync off in the bar under the panes to explore independently. Menus, dialogs, and other site interactions stay independent.

Published sites are independent, AI-generated demos served from separate preview origins with local mock data. They are not products, and no UIBenchmark session data crosses to them.