Nerdulator> put something in

Recognised as Colour

#21C5CD

  • #21C5CD
  • Cyan
  • Dark
  • Nearest: Dark turquoise

#21C5CD is a cyan with RGB values 33, 197, 205 and HSL 183°, 72%, 47%. It is a dark colour, so black text on it reaches 9.9:1 contrast (AAA for normal text). The nearest named colour is Dark turquoise.

Colour values

#21C5CD#21C5CD
HEX#21C5CD
RGBrgb(33, 197, 205)
RGB (0–1)0.1294, 0.7725, 0.8039
RGB percentages12.9%, 77.3%, 80.4%
HSLhsl(182.8, 72.3%, 46.7%)
HSV / HSBhsv(182.8, 83.9%, 80.4%)
CMYK83.9%, 3.9%, 0%, 19.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,213,325
CSS custom property--colour: #21C5CD;

Brightness & contrast

Relative luminance0.44664WCAG 2.x, 0 is black and 1 is white
Perceived brightness167 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 9.93:1
Contrast with white2.11:1WCAG normal text: Fail
Contrast with black9.93:1WCAG normal text: AAA
Greyscale equivalent#A3A3A3
Inverted#DE3A32

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#B6BCCEno red cones; affects about 1% of men; ΔE 37.8 from the original
Deuteranopia#9FABCEno green cones; the most common form, about 1% of men; ΔE 39.4 from the original
Tritanopia#00CDC7no blue cones; rare, and affects men and women equally; ΔE 9.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.11:1WCAG large text: Fail
Contrast with black, large text9.93:1WCAG large text: AAA

Named colours

Dark turquoise · ΔE 5.3Medium turquoise · ΔE 8.2Light seagreen · ΔE 11.4Turquoise · ΔE 16.4Cadetblue · ΔE 21.3Dark cyan · ΔE 22
Nearest named CSS colourDark turquoise (#00CED1)ΔE 5.31, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CD2921
Analogous#21CD7F, #216FCD
Triadic#CD21C5, #C5CD21
Split complementary#CD216F, #CD7F21
Tetradic#7F21CD, #CD2921, #6FCD21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C4F3F6
Lighter +30%#98EAEF
Lighter +20%#6DE2E7
Lighter +10%#41D9E0
Darker −10%#1A9BA1
Darker −20%#137175
Darker −30%#0C4649
Darker −40%#051C1D
More saturated +25%#03E0EB
Less saturated −25%#3FAAAF

Channel breakdown

R33
G197
B205
Red33 (12.9%)
Green197 (77.3%)
Blue205 (80.4%)
Hue182.79°
Saturation (HSL)72.27%
Lightness46.67%
Dominant channelBlue
Hex per channelR 21 · G C5 · B CD

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

Nerdulate something else

Nothing in mind? Surprise me · today’s page

Every value on this page was computed from “21c5cd” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.