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Recognised as Colour

#21CBDE

  • #21CBDE
  • Cyan
  • Dark
  • Nearest: Dark turquoise

#21CBDE is a cyan with RGB values 33, 203, 222 and HSL 186°, 74%, 50%. It is a dark colour, so black text on it reaches 10.7:1 contrast (AAA for normal text). The nearest named colour is Dark turquoise.

Colour values

#21CBDE#21CBDE
HEX#21CBDE
RGBrgb(33, 203, 222)
RGB (0–1)0.1294, 0.7961, 0.8706
RGB percentages12.9%, 79.6%, 87.1%
HSLhsl(186, 74.1%, 50%)
HSV / HSBhsv(186, 85.1%, 87.1%)
CMYK85.1%, 8.6%, 0%, 12.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,214,878
CSS custom property--colour: #21CBDE;

Brightness & contrast

Relative luminance0.48309WCAG 2.x, 0 is black and 1 is white
Perceived brightness173.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 10.66:1
Contrast with white1.97:1WCAG normal text: Fail
Contrast with black10.66:1WCAG normal text: AAA
Greyscale equivalent#A8A8A8
Inverted#DE3421

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#B8C3DFno red cones; affects about 1% of men; ΔE 36 from the original
Deuteranopia#A0B1DEno green cones; the most common form, about 1% of men; ΔE 37.8 from the original
Tritanopia#00D5D1no blue cones; rare, and affects men and women equally; ΔE 14.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.97:1WCAG large text: Fail
Contrast with black, large text10.66:1WCAG large text: AAA

Named colours

Dark turquoise · ΔE 10Medium turquoise · ΔE 13.3Light seagreen · ΔE 17.8Sky blue · ΔE 19Turquoise · ΔE 21Aqua · ΔE 22.8
Nearest named CSS colourDark turquoise (#00CED1)ΔE 9.97, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DE3421
Analogous#21DE93, #216DDE
Triadic#DE21CB, #CBDE21
Split complementary#DE216D, #DE9321
Tetradic#9321DE, #DE3421, #6DDE21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D3F5F8
Lighter +30%#A6EAF2
Lighter +20%#7AE0EB
Lighter +10%#4DD5E5
Darker −10%#1AA2B2
Darker −20%#147A85
Darker −30%#0D5159
Darker −40%#07292C
More saturated +25%#01E4FE
Less saturated −25%#41B2BE

Channel breakdown

R33
G203
B222
Red33 (12.9%)
Green203 (79.6%)
Blue222 (87.1%)
Hue186.03°
Saturation (HSL)74.12%
Lightness50%
Dominant channelBlue
Hex per channelR 21 · G CB · B DE

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