Icons
iOS (all icons in PNG format) 76x76 Standard Resolution iPad 152x152 (@2x DPI) iPad and iPad Mini 120x120 (@2x DPI) iPhone 4, 5 and 6 180x180 (@3x DPI) iPhone6+
Windows 8+ (PNG format) 310x310
Splash Screens for iOS
iPad 2 and iPad Mini 768 x 1024 (portrait) 1024 x 768 (landscape)
iPad and iPad mini (@2x) 1536 x 2048 (portrait) 2048 x 1536 (landscape)
iPhone 4 (@2x) 640 x 960 (portrait) 960 x 640 (landscape)
For iPhone 5 (@2x) 640 x 1136 (portrait) 1136 x 640 (landscape)
For iPhone 6: 750 x 1334 (@2x) for portrait 1334 x 750 (@2x) for landscape
For iPhone 6 Plus: 1242 x 2208 (@3x) for portrait 2208 x 1242 (@3x) for landscape