Supa Gradient plugin allows you to create and manage gradients
Build color palettes for free with importing images from camera. Sync across iCloud and available for free on iOS and macOS.
A deep learning semantic color generator for user interface states.
Helpful reference collecting 600+ brand color codes all over the world.
Capture photos and auto convert real-life hues into color palettes with Adobe Capture CC. It also directly integrates to to your Adobe CC's swatches if you are a subscriber.
Color section of Apple’s Human Interface Guidelines is a great introductory piece for color design when you are designing websites and apps.
Colorbook converts colors easily to any printing and coding format. It also visualizes color pairing as web design color scheme.
The most convenient app to grab color code is the one built-in to your Mac. Digital Color Meter is a default Mac utilities app hidden in your Application folder. Simply press Shift + Command + C will
Train your eyesight to be laser-like. Munsell Hue Test is a fun yet challenging game to arrange color block by hue order. Lower the score is better.