i've been using this as my default calculator, and it's unparalleled so far. but recently, i'm beginning to get annoyed because i can no longer use it if i am offline - and i opt to be offline most of the time! everytime i click on it, the google play pops up first notifying me that i am offline, and with it i can't use the app. it's paid, no ads, a calculator on a daily basis, but i can't use it offline?! license check is necessary, yes; but for a paid app, once is enough. pretty annoying.