Faded colors after render

No simple answers. Color management can't be half-assed and just setting a project color space is meaningless if you don't use the correct profile for preview. That applies across the board AE, Photoshop, illustrator and so on. In addition you might want to read up on what color management (or lack thereof) mobile devices have, what Gamma they use and so on. Again no point in even enabling CM when your mobile device doesn't recognize the embedded profiles. Hence in your case the obvious answer would have to be: Just leave everything at defaults and don't even mess with CM settings. You video will simply look different on mobile devices. There just is no way to match colors 100% exact unless you use the native UI toolkit of the operating system and account for things like automatic brightness adjustment, night mode and whatever you can imagine. You have to live with those limitations. At best you can tweak your system color settings and hope it looks okay. Your desktop is of course another story, but based on what I just wrote that would be a whole different exercise and even so there would be no way to ensure the video looks correct on your color managed desktop monitor and your mobile device. So again you have to make up your mind what's actually important and find a middleground. Reading up on some of the basics won't hurt, naturally, but this simply isn't a "Which setting must I use?" question but rather a case of taking all the steps. Start by resetting any customized color settings and profiles and work from this as a basis to instate a consistent generic sRGB color space.

Mylenium