At the beginning of every web project you undertake should be very clear devices and their respective resolutions to know or at least have an idea of the challenges you may encounter along the way.
ScreenSizes is a website with a large database of decisions of most mobile devices or smartphones that are currently available on the market, as well as tablets and even monitors the great information table each device includes:
Physical size in inches or centimeters.
Width of the device.
Pixels per inch.
A key to quickly know the resolution of these devices where your next idea or the results of your incredible inspiration resource will run.