Recognised as Colour
#21FFD9
- #21FFD9
- Cyan
- Light
- Nearest: Aquamarine
#21FFD9 is a cyan with RGB values 33, 255, 217 and HSL 170°, 100%, 56%. It is a light colour, so black text on it reaches 16.4:1 contrast (AAA for normal text). The nearest named colour is Aquamarine.
Colour values
#21FFD9#21FFD9
HEX#21FFD9
RGBrgb(33, 255, 217)
RGB (0–1)0.1294, 1, 0.851
RGB percentages12.9%, 100%, 85.1%
HSLhsl(169.7, 100%, 56.5%)
HSV / HSBhsv(169.7, 87.1%, 100%)
CMYK87.1%, 0%, 14.9%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,228,185
CSS custom property--colour: #21FFD9;
Brightness & contrast
Relative luminance0.76853WCAG 2.x, 0 is black and 1 is white
Perceived brightness209.4 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 16.37:1
Contrast with white1.28:1WCAG normal text: Fail
Contrast with black16.37:1WCAG normal text: AAA
Greyscale equivalent#CDCDCD
Inverted#DE0026
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.28:1WCAG large text: Fail
Contrast with black, large text16.37:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#FF2147
Analogous#21FF6A, #21B6FF
Triadic#D921FF, #FFD921
Split complementary#FF21B6, #FF6A21
Tetradic#6A21FF, #FF2147, #B6FF21
Tints, shades & saturation
Channel breakdown
R33
G255
B217
Red33 (12.9%)
Green255 (100%)
Blue217 (85.1%)
Hue169.73°
Saturation (HSL)100%
Lightness56.47%
Dominant channelGreen
Hex per channelR 21 · G FF · B D9
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