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Both the iPad (Retina) version and iPhone version squeeze the covers a little too much vertikallinje.
It's not imidiately noticable, but I guess about 5% off.

On the iPAD if you click the cover to bring it up to full size, the scale is right again.

Thank you for the feedback, I have adjusted the dimensions on the iPad of the cover area by 4 extra height pixels to better fit the average size of a cover. I have also reduced the acceptable distortion that the iPad will allow on the cover by half, it used to be 8%. This value came from the iPhone version were I have left it intact as the average cover requires a distortion of 5% to 7% to fit into the 1.3 aspect ratio of the iPhone screen (the area left over after the toolbar and status bar, the full screen of the iPhone has a 1.5 ratio). It's actually quite nice when the cover almost fits that it actually cover the entire screen then leaving a few blank pixels on either side. But you're absolutely correct that this was not necessary on the iPad and it was a carry over from the iPhone. So look for that in the next version.