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Recognised as Colour

#5151AC

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

#5151AC is a blue with RGB values 81, 81, 172 and HSL 240°, 36%, 50%. It is a dark colour, so white text on it reaches 6.7:1 contrast (AA for normal text). The nearest named colour is Dark slateblue.

Colour values

#5151AC#5151AC
HEX#5151AC
RGBrgb(81, 81, 172)
RGB (0–1)0.3176, 0.3176, 0.6745
RGB percentages31.8%, 31.8%, 67.5%
HSLhsl(240, 36%, 49.6%)
HSV / HSBhsv(240, 52.9%, 67.5%)
CMYK52.9%, 52.9%, 0%, 32.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,329,324
CSS custom property--colour: #5151AC;

Brightness & contrast

Relative luminance0.10613WCAG 2.x, 0 is black and 1 is white
Perceived brightness95.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.73:1
Contrast with white6.73:1WCAG normal text: AA
Contrast with black3.12:1WCAG normal text: Fail
Greyscale equivalent#585858
Inverted#AEAE53

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#205FAFno red cones; affects about 1% of men; ΔE 16 from the original
Deuteranopia#1458AAno green cones; the most common form, about 1% of men; ΔE 14.4 from the original
Tritanopia#2A6576no blue cones; rare, and affects men and women equally; ΔE 51.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text6.73:1WCAG large text: AAA
Contrast with black, large text3.12:1WCAG large text: AA

Named colours

Dark slateblue · ΔE 10.6Slate blue · ΔE 14.9Rebecca purple · ΔE 18.1Royal blue · ΔE 18.6Medium purple · ΔE 19.4Midnight blue · ΔE 23.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 10.62, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#ACAC51
Analogous#517FAC, #7F51AC
Triadic#AC5151, #51AC51
Split complementary#AC7F51, #7FAC51
Tetradic#AC517F, #ACAC51, #51AC7F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#DBDBEE
Lighter +30%#B8B8DE
Lighter +20%#9696CD
Lighter +10%#7373BD
Darker −10%#414189
Darker −20%#303067
Darker −30%#202044
Darker −40%#101021
More saturated +25%#3131CC
Less saturated −25%#71718C

Channel breakdown

R81
G81
B172
Red81 (31.8%)
Green81 (31.8%)
Blue172 (67.5%)
Hue240°
Saturation (HSL)35.97%
Lightness49.61%
Dominant channelBlue
Hex per channelR 51 · G 51 · B AC

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