Easi Calc for free

I’m a pure indie developer.
It's like putting your time and effort into the quality concert.
Whether you decide to invest or not, it's your choice.
Just like this, if a life-long quality app is here, would you just pass it by?
I'm assured, this calculator will devote deeply in your phone.

advantage)
-clear
-joyful
-convenience
-good developer
feature)
-support retina
-support universal (support iPad)
-add export to text file
-UI for readability
-two type of theme
-intuitive animate effect
utility)
-multinomial arithmetic operation
-percentage calculate
-'00' button
-if app's terminated, calculation results are remained.