The ‘Pomodrone’ app is a beautifully crafted, simple and unobtrusive Pomodoro timer. As you scroll down the One Pager it features gorgeous CSS transitions of an iPhone moving around demonstrating the app. Love the clean font and use of whitespace.
This website has unfortunately redesigned or gone offline, so I have removed the link to it. The screenshot below hopefully preserved enough of the design but if you are really keen to inspect further, try this link on the Archive.org website. FYI: the site was first featured on 29 January 2014.