That's fair, and I am glad we're on the same page about privacy. It's important to us, but also hard as hell to communicate that we're not trying to steal or read your stuff. :)

As far as the product... the efficiency is due in part to the behavioral algorithm and in part to the information architecture of the app itself.

The archive and inbox are literally structured in a way that makes it easier and faster to get to everything, find old attachments, search for content, and so on. A deeper explanation of that part is gonna get long without some visuals, so if I may, let's leave it there and we'll post more info when we can (remember that we're only proving our concept with this site).

The behavioral algorithm basically treats everything you do in email as information about what and who is important, and we use that to make sure that important stuff rises to the top, conversations are threaded in a useful way, and so on. As far as I know, there isn't another app that does it like that.

For now (until we get a little further and create some more explanatory materials) hopefully that satisfies your question.