In this post I am showing a list screen resolutions for popular devices, this list will grow and shrink as time goes by based on device popularity.

You will find that most devices fall into a common resolution group, ie many android devices of 2010-2012 had a device res of 800×480 pixels, then in 2012+ they bumped up to 1280×720 pixels.
To confidently call your app a ‘Universal App’ it is recommended you successfully test the main groups and the obvious exceptions like the iPhone5 res of 1136×640;

When creating a universal app, I like to print off this list – crossing off the devices the devices/resolutions that have been tested.

Device Screen size dpi Suggested ratio
iPhone 5 / iPod Touch 1136 × 640 326ppi 2
iPhone 4 960 × 640 326ppi 2
iPhone 4S 960 × 640 326ppi 2
iPad (3rd gen) 2048 × 1536 264ppi 2
MacBook Retina 2880 x 1800 220ppi 2
Xperia S 720 × 1280 342ppi 2
One X 720 × 1280 312ppi 2
EVO LTE 720 × 1280 312ppi 2
Galaxy Note 800 × 1280 285ppi 2
Galaxy SIII 720 × 1280 306ppi 2
Galaxy Nexus 720 × 1280 316ppi 2
HTC Desire 480 × 800 252ppi 1.5
Nexus One 480 × 800 252ppi 1.5
Sensation 960 × 540 256ppi 1.5
Evo 3D 960 × 540 256ppi 1.5
Sensation XE 960 × 540 256ppi 1.5
LG Optimus 2X 480 × 800 233ppi 1.5
Defy+ 854 × 480 265ppi 1.5
Milestone 480 × 854 265ppi 1.5
Nexus S SAMOLED 480 × 800 235ppi 1.5
Nexus S LCD 480 × 800 235ppi 1.5
Galaxy S Plus 480 x 800 233ppi 1.5
Galaxy SII 480 × 800 219ppi 1.5
Galaxy Tab 600 × 1024 171ppi 1.5
iPad mini 1024 × 768 163ppi 1
iPhone 480 × 320 163ppi 1
iPhone 3G 480 × 320 163ppi 1
iPhone 3GS 480 × 320 163ppi 1
iPad (1st gen) 1024 × 768 132ppi 1
iPad 2 1024 × 768 132ppi 1
Kidle Fire 1024 × 600 169ppi 1
Galaxy Y (S5360) 240 × 320 133ppi 0.75