What are the actual sizes of layouts, app designs for iOS and Android?

Question

Android

What size should the psd layout be, for iOS applications and for Android, I mean the sizes that are relevant in 2017, and is a modular grid used for such design rendering, such as bootstrap or 960 used for sites?

Answer 1

for iOS now the main layout is usually drawn in 375x675 @ 2x, since most of the newly bought phones now are 6/6S/7. If there are resources, it is also desirable to have layouts in 320x568 @2x and 414x736 @3x

Answer 2

did not try to use services like sympli.io, zepplin.io - there all issues related to layouts have already been resolved