Screen Resolutions

iPhone 3, 3G

320x480px

iPhone 4, 4S

640x960px

iPhone 5, 5C, 5S

640 x 1136

iPhone 6

750 x 1334

iPhone 6 Plus

1242 x 2208 (seen by apps) which is downsampled to an actual screen output resolution of 1080 x 1920 (explanations here and here)

iPad1, iPad2, iPad Mini original

768x1024px (20 pixels taken up by top bar)

iPad 3rd Gen, iPad Air, iPad Mini Retina

1536x2048px

Good Screen And Element Size Resources

the-ios-7-design-cheat-sheet

 

 

UK Electronic Designer