General navigation
The actual arrangement of buttons and the overall feel of the UI may be very different, but Foundry is organized a lot like Roll20. For example, the row of buttons, top right on Roll20 (Chat, Journal, etc.) are very similar to the vertical stack of buttons on the right of the Foundry screen.
Chat boxes are pretty similar, with one exception. In Foundry, if you don’t have any of the side buttons activated, chat messages will briefly show up at the bottom right of the screen and then disappear.
