Maybe it's obvious to others but I didn't really know what you were selling until the first FAQ. Maybe you need a strapline something like "a new way to work with your Google Mail". I thought it was perhaps an independent MUA app (and assumed it was going to be Mac only, because of the name).

When I first arrived on the page I clicked your first call to action button, which takes one to a Google login, but backed out because I hadn't a clue at that point what it was.

Looks like "a front-end to gmail using Google's API", I guess you need to put that in non-tech speak.