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Recognised as Colour

#2158B1

  • #2158B1
  • Blue
  • Dark
  • Nearest: Dark slateblue

#2158B1 is a blue with RGB values 33, 88, 177 and HSL 217°, 69%, 41%. It is a dark colour, so white text on it reaches 6.8:1 contrast (AA for normal text). The nearest named colour is Dark slateblue.

Colour values

#2158B1#2158B1
HEX#2158B1
RGBrgb(33, 88, 177)
RGB (0–1)0.1294, 0.3451, 0.6941
RGB percentages12.9%, 34.5%, 69.4%
HSLhsl(217.1, 68.6%, 41.2%)
HSV / HSBhsv(217.1, 81.4%, 69.4%)
CMYK81.4%, 50.3%, 0%, 30.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,185,393
CSS custom property--colour: #2158B1;

Brightness & contrast

Relative luminance0.10477WCAG 2.x, 0 is black and 1 is white
Perceived brightness91.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.78:1
Contrast with white6.78:1WCAG normal text: AA
Contrast with black3.1:1WCAG normal text: Fail
Greyscale equivalent#535353
Inverted#DEA74E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2162B4no red cones; affects about 1% of men; ΔE 7 from the original
Deuteranopia#0055AFno green cones; the most common form, about 1% of men; ΔE 2.3 from the original
Tritanopia#006E7Cno blue cones; rare, and affects men and women equally; ΔE 52.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.78:1WCAG large text: AAA
Contrast with black, large text3.1:1WCAG large text: AA

Named colours

Dark slateblue · ΔE 16.7Royal blue · ΔE 19.1Slate blue · ΔE 22.3Dodgerblue · ΔE 24.1Cornflower blue · ΔE 24.2Medium purple · ΔE 26.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 16.75, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B17A21
Analogous#21A0B1, #3221B1
Triadic#B12158, #58B121
Split complementary#B13221, #A0B121
Tetradic#B121A0, #B17A21, #21B132

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#AEC7F0
Lighter +30%#83AAE8
Lighter +20%#588CE0
Lighter +10%#2D6ED8
Darker −10%#194386
Darker −20%#112D5B
Darker −30%#091830
Darker −40%#010305
More saturated +25%#0752CB
Less saturated −25%#3B5E97

Channel breakdown

R33
G88
B177
Red33 (12.9%)
Green88 (34.5%)
Blue177 (69.4%)
Hue217.08°
Saturation (HSL)68.57%
Lightness41.18%
Dominant channelBlue
Hex per channelR 21 · G 58 · B B1

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Every value on this page was computed from “2158b1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.