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Recognised as Colour

#5151A9

  • #5151A9
  • Blue
  • Dark
  • Nearest: Dark slateblue

#5151A9 is a blue with RGB values 81, 81, 169 and HSL 240°, 35%, 49%. 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

#5151A9#5151A9
HEX#5151A9
RGBrgb(81, 81, 169)
RGB (0–1)0.3176, 0.3176, 0.6627
RGB percentages31.8%, 31.8%, 66.3%
HSLhsl(240, 35.2%, 49%)
HSV / HSBhsv(240, 52.1%, 66.3%)
CMYK52.1%, 52.1%, 0%, 33.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,329,321
CSS custom property--colour: #5151A9;

Brightness & contrast

Relative luminance0.10499WCAG 2.x, 0 is black and 1 is white
Perceived brightness95.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.77:1
Contrast with white6.77:1WCAG normal text: AA
Contrast with black3.1:1WCAG normal text: Fail
Greyscale equivalent#575757
Inverted#AEAE56

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#245FACno red cones; affects about 1% of men; ΔE 15.8 from the original
Deuteranopia#1A58A7no green cones; the most common form, about 1% of men; ΔE 14.2 from the original
Tritanopia#2D6475no blue cones; rare, and affects men and women equally; ΔE 49.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text6.77:1WCAG large text: AAA
Contrast with black, large text3.1:1WCAG large text: AA

Named colours

Dark slateblue · ΔE 9.6Slate blue · ΔE 16.5Rebecca purple · ΔE 18.8Royal blue · ΔE 20Medium purple · ΔE 20.3Midnight blue · ΔE 23.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 9.63, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A9A951
Analogous#517DA9, #7D51A9
Triadic#A95151, #51A951
Split complementary#A97D51, #7DA951
Tetradic#A9517D, #A9A951, #51A97D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D9D9ED
Lighter +30%#B7B7DC
Lighter +20%#9494CC
Lighter +10%#7272BB
Darker −10%#404087
Darker −20%#303064
Darker −30%#1F1F42
Darker −40%#0F0F1F
More saturated +25%#3232C8
Less saturated −25%#70708A

Channel breakdown

R81
G81
B169
Red81 (31.8%)
Green81 (31.8%)
Blue169 (66.3%)
Hue240°
Saturation (HSL)35.2%
Lightness49.02%
Dominant channelBlue
Hex per channelR 51 · G 51 · B A9

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Every value on this page was computed from “5151a9” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.