Digital Color Meter
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 copy the value into the clipboard. You can also adjust color profile (native, sRGB, Adobe RGB or P3 etc.) as well as the values to display
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Colorbook converts colors easily to any printing and coding format. It also visualises color pairing as web design color scheme.
Adobe Capture CC
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.
Supa Gradient plugin allows you to create and manage gradients