I will change that asap. It's too confusing.
Sorry, but there should be a difference of $22 to purchase the yearly plan (which saves $11 - oh I see you meant to type $11 not $1). Yes, perhaps it's not that much of a difference, but it can add up :)
As regards the mobile app, Darwin Mail is currently mobile responsive to it looks and works great on your tablet or mobile. I know it's not the same though. May I ask, why do you prefer a native app over a responsive web app?