Nerdulator> put something in

Recognised as Colour

#21B8DC

  • #21B8DC
  • Cyan
  • Dark
  • Nearest: Sky blue

#21B8DC is a cyan with RGB values 33, 184, 220 and HSL 192°, 74%, 50%. It is a dark colour, so black text on it reaches 9:1 contrast (AAA for normal text). The nearest named colour is Sky blue.

Colour values

#21B8DC#21B8DC
HEX#21B8DC
RGBrgb(33, 184, 220)
RGB (0–1)0.1294, 0.7216, 0.8627
RGB percentages12.9%, 72.2%, 86.3%
HSLhsl(191.6, 73.9%, 49.6%)
HSV / HSBhsv(191.6, 85%, 86.3%)
CMYK85%, 16.4%, 0%, 13.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,210,012
CSS custom property--colour: #21B8DC;

Brightness & contrast

Relative luminance0.39772WCAG 2.x, 0 is black and 1 is white
Perceived brightness160.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.95:1
Contrast with white2.35:1WCAG normal text: Fail
Contrast with black8.95:1WCAG normal text: AAA
Greyscale equivalent#9A9A9A
Inverted#DE4723

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#A2B3DEno red cones; affects about 1% of men; ΔE 29.1 from the original
Deuteranopia#8AA2DCno green cones; the most common form, about 1% of men; ΔE 30.8 from the original
Tritanopia#00C4C4no blue cones; rare, and affects men and women equally; ΔE 22.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.35:1WCAG large text: Fail
Contrast with black, large text8.95:1WCAG large text: AAA

Named colours

Sky blue · ΔE 15.8Deep skyblue · ΔE 16Light skyblue · ΔE 17.3Dark turquoise · ΔE 22.3Cadetblue · ΔE 23.2Medium turquoise · ΔE 25
Nearest named CSS colourSky blue (#87CEEB)ΔE 15.77, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DC4521
Analogous#21DCA2, #215BDC
Triadic#DC21B8, #B8DC21
Split complementary#DC215B, #DCA221
Tetradic#A221DC, #DC4521, #5BDC21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D1F1F8
Lighter +30%#A5E3F1
Lighter +20%#78D5EB
Lighter +10%#4CC7E4
Darker −10%#1A93B0
Darker −20%#146E83
Darker −30%#0D4957
Darker −40%#06242B
More saturated +25%#01CBFC
Less saturated −25%#41A5BC

Channel breakdown

R33
G184
B220
Red33 (12.9%)
Green184 (72.2%)
Blue220 (86.3%)
Hue191.55°
Saturation (HSL)73.91%
Lightness49.61%
Dominant channelBlue
Hex per channelR 21 · G B8 · B DC

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 “21b8dc” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.