The price is USD yes so it should be 12.00 . Thanks for reminding me :). Fixed now.
If you try it be sure to tell me if something bothers you. If then this post is outdated you can also email me at janko DOT itm AT gmail.
I had price floors at the other already released app, but changed it to ceilings because I always felt bad, like I micro-cheat them right there at the front page. By telling them the cheapest price, but then they see the "default" price per month is actually higher and only if they pay for multiple months they get that price.