Aescripts Swatcheroo 1.1.2 for After Effects MacOS
https://aescripts.com/swatcheroo/

Swatcheroo is your handy dandy swatch pal. That's, uh, short for 'palette.'
Photoshop's got it! Illustrator's got it! Animate's got it– and now AE's got it, too!Swatcheroo is a super simple panel for applying, reading, and storing colours.No clunky, slow, or weird expressions; no helper comps or other bloaty shortcuts. Just colours.