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Recognised as Colour

#21FF9F

  • #21FF9F
  • Cyan
  • Light
  • Nearest: Medium spring green

#21FF9F is a cyan with RGB values 33, 255, 159 and HSL 154°, 100%, 56%. It is a light colour, so black text on it reaches 15.9:1 contrast (AAA for normal text). The nearest named colour is Medium spring green.

Colour values

#21FF9F#21FF9F
HEX#21FF9F
RGBrgb(33, 255, 159)
RGB (0–1)0.1294, 1, 0.6235
RGB percentages12.9%, 100%, 62.4%
HSLhsl(154.1, 100%, 56.5%)
HSV / HSBhsv(154.1, 87.1%, 100%)
CMYK87.1%, 0%, 37.6%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,228,127
CSS custom property--colour: #21FF9F;

Brightness & contrast

Relative luminance0.74347WCAG 2.x, 0 is black and 1 is white
Perceived brightness203.4 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 15.87:1
Contrast with white1.32:1WCAG normal text: Fail
Contrast with black15.87:1WCAG normal text: AAA
Greyscale equivalent#C9C9C9
Inverted#DE0060

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#FDEA99no red cones; affects about 1% of men; ΔE 66.3 from the original
Deuteranopia#E5D9A5no green cones; the most common form, about 1% of men; ΔE 66.7 from the original
Tritanopia#00FDE7no blue cones; rare, and affects men and women equally; ΔE 39.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.32:1WCAG large text: Fail
Contrast with black, large text15.87:1WCAG large text: AAA

Named colours

Medium spring green · ΔE 1.8Spring green · ΔE 16.2Pale green · ΔE 22.8Light green · ΔE 24.4Medium seagreen · ΔE 33.4Aquamarine · ΔE 33.6
Nearest named CSS colourMedium spring green (#00FA9A)ΔE 1.82, below the just-noticeable difference
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF2181
Analogous#21FF30, #21F0FF
Triadic#9F21FF, #FF9F21
Split complementary#FF21F0, #FF3021
Tetradic#3021FF, #FF2181, #F0FF21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EDFFF7
Lighter +30%#BAFFE1
Lighter +20%#87FFCB
Lighter +10%#54FFB5
Darker −10%#00ED87
Darker −20%#00BA6A
Darker −30%#00874D
Darker −40%#005430
More saturated +25%#21FF9F
Less saturated −25%#3DE39B

Channel breakdown

R33
G255
B159
Red33 (12.9%)
Green255 (100%)
Blue159 (62.4%)
Hue154.05°
Saturation (HSL)100%
Lightness56.47%
Dominant channelGreen
Hex per channelR 21 · G FF · B 9F

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Every value on this page was computed from “21ff9f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.