Pixel and Resolution Sizes

Its important before designing that I know the pixel and sizing of what I am designing for although of course I wont be making the app it'll be good to know the canvas size that I should be working at. I only got the specs for the latest iphone/pad since we aren't making it I don't have to worry too much about other sizes.

The iPhone 5 specs: 1136 by 640 with a 326 ppi resolution

The iPad Air- 2048 by 1536 with a 264 ppi resolution

http://www.apple.com/uk/iphone-5s/specs/
http://www.apple.com/uk/ipad-air/specs/