Do I need 2560 * 1440 monitor for portrait?

recent phone’s height is easily over 800, even 1280, 1920

I want to see full of 800 * 1280 portrait unity’s game screen, but develop with monitor of 1080 height, I see crushed, short height than 1280.

It is much cheaper to buy a monitor which has a pivot feature. And you don’t really need pixel accuracy with new high end phones/tablets since high DPI values will make error spotting so much harder.

thx. I just need to test all GUI’s elements are properly positioned at 768 * 1280 (or more) phone.