Have you ever thought that the Minecraft UI needs to be doubled in resolution? Hopefully, I can't hear you but if you said yes,

THIS IS THE THING TO GET BECAUSE THATS WHAT IT DOES!!!

Tip: Get a HD font pack because HDUI doesn't have a HD font and probably never will :).

(yes i know that not all of the ui is HD, i cant find the buttons textures where did they go) And if you said no, then uh go do something else?