Bookmark OS is like Mac or Windows optimized for bookmarks. Visualize Your Bookmarks It's easier to find a bookmark by visualizing where it is versus having to guess with search or tags. It also makes browsing much easier, 'Oh yea, I remember that hilarious gif of a tiny pug in a unicorn costume!' Sort your bookmarks Can't find a bookmark you opened last week? Click 'View all' and sort by last opened.