Just a couple of design things: Black text on that blue background doesn't provide enough contrast for what's supposed to be your main headline. Also, I've come to expect buttons to have hover states, and yours don't.

As for the product itself, I'd like to see a better explanation of why I should pay $10 a month to see some basic stats about my posts' tweets/shares. Facebook Insights, for example, gives all that information to me for free.