Apple Screen Resolutions - iPhone XS, iPhone XS Max, iPhone XR and 11“ iPad Pro
Discussion] This app is what I've been talking about for the longest! A tweak that changes the whole aspect ratio into the ratio of the old iPhones. : r/jailbreak
Mobile design 101: pixels, points and resolutions
iPhone 6 Screen Size and Mobile Design Tips - Updated for iPhone 8 & X!
Screen resolution - Apple Community
Device pixel ratio - Mobile Web Development - YouTube