Intriguing One Pager for an upcoming customizable to-do app called Check. This is a great reference to spicing up a simple launching soon page too. Note the interactive check-able logo, the newsletter signup form animation, the sound effect when you subscribe and of course the impressive spinning 3D cube magically changing content.
This website has unfortunately been redesigned or gone offline, so I have removed the direct link to it. The screenshot below hopefully preserved enough of the design but if you are really keen to inspect further, try this Archive.org link. FYI: the site was first featured on 06 July 2020.