It doesn't seem to have launched publically yet but I hope they will have a landing page with utterly clear copy in a large font written with the mindset that for example this sentence

"Once you have entered your email address, SC4 will automatically provision you with a set of random keys."

is terrifyingly incomprehensible gobbledygook.

...actually I might be confused right now but even I (a total smartypants guy) can't seem to figure out how to paste in somebody else's public key in there. The default option is to encrypt for myself, and I see no way to input another key, only a text box for the message...

Edit: oh, maybe the text box is for the keys, and the thing I want to encrypt should be drag and dropped? Either way, the UI as it is right now is difficult to understand, but I suppose it is a prototype.