• Display modes
    • RGB percentage
    • RGB decimal
    • RGB hexadecimal
    • Hue/Saturation/Brightness (HSB)
    • Hue/Saturation/Lightness (HSL)
    • Y'PbPr and Y'CbCr (both ITU-R BT.601 and ITU-R 709)
    • CIE 1931, CIE 1976, CIE LAB, and Tristimulus values

• Commands
    • Lock cursor position / X axis / Y axis
    • Adjust magnification (1x/2x/4x/8x)
    • Adjust aperture size
    • Show/hide cursor coordinates
    • Update preview continuously
    • Hold Color (allows editing of color in RGB and HSB modes)
    • Save/Copy preview image
    • Copy Color as Text, Image, or as a NSColor/UIColor/HTML/CSS code snippet
    • Paste Text as color

• Preferences
    • Adjust aperture color
    • Assign actions for clicking/dragging the color swatch
    • Use lower-case letters for hex values
    • Include pound sign prefix for hex values
    • Show visual guides when locking cursor position
    • Show component sliders when in Hold Color mode
    • Assign global keyboard shortcuts
    • Move mouse cursor with arrow keys

Compatibility: OS X 10.10 or later, 64-bit processor

More info - https://www.ricciadams.com/projects/classic-color-meter