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Colour

#21508F

  • #21508F
  • Blue
  • Dark
  • Nearest: Dark slateblue

#21508F is a blue with RGB values 33, 80, 143 and HSL 214°, 63%, 35%. It is a dark colour, so white text on it reaches 8:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#21508F#21508F
HEX#21508F
RGBrgb(33, 80, 143)
RGB (0–1)0.1294, 0.3137, 0.5608
RGB percentages12.9%, 31.4%, 56.1%
HSLhsl(214.4, 62.5%, 34.5%)
HSV / HSBhsv(214.4, 76.9%, 56.1%)
CMYK76.9%, 44.1%, 0%, 43.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,183,311
CSS custom property--colour: #21508F;

Brightness & contrast

Relative luminance0.08044WCAG 2.x, 0 is black and 1 is white
Perceived brightness80.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.05:1
Contrast with white8.05:1WCAG normal text: AAA
Contrast with black2.61:1WCAG normal text: Fail
Greyscale equivalent#4B4B4B
Inverted#DEAF70

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#315691no red cones; affects about 1% of men; ΔE 4 from the original
Deuteranopia#1D4B8Eno green cones; the most common form, about 1% of men; ΔE 3.7 from the original
Tritanopia#005F68no blue cones; rare, and affects men and women equally; ΔE 39 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.05:1WCAG large text: AAA
Contrast with black, large text2.61:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19.2Steel blue · ΔE 22.8Cornflower blue · ΔE 29.6Midnight blue · ΔE 32.1Royal blue · ΔE 34.8Dodgerblue · ΔE 34.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 19.16, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8F6021
Analogous#21878F, #29218F
Triadic#8F2150, #508F21
Split complementary#8F2921, #878F21
Tetradic#8F2187, #8F6021, #218F29

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#95B8E7
Lighter +30%#6C9CDD
Lighter +20%#4280D3
Lighter +10%#2B67B8
Darker −10%#173966
Darker −20%#0E223C
Darker −30%#040A13
Darker −40%#000000
More saturated +25%#0B4DA5
Less saturated −25%#375379

Channel breakdown

R33
G80
B143
Red33 (12.9%)
Green80 (31.4%)
Blue143 (56.1%)
Hue214.36°
Saturation (HSL)62.5%
Lightness34.51%
Dominant channelBlue
Hex per channelR 21 · G 50 · B 8F

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Every value on this page was computed from “21508f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.