USD$10 with 1 year of updates. Consider Sip as the professional version of Digital Color Meter, it is the best color tool built for pro-user in mind, providing seamless integration to professional workflows and applications. I love how It docks color palettes on top of the screen in a minimalist way, allowing cross-app usage. v2 is available now with more useful features and new pricing model.
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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