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Colour

#0A3A9D

  • #0A3A9D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#0A3A9D is a blue with RGB values 10, 58, 157 and HSL 220°, 88%, 33%. It is a dark colour, so white text on it reaches 10:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#0A3A9D#0A3A9D
HEX#0A3A9D
RGBrgb(10, 58, 157)
RGB (0–1)0.0392, 0.2275, 0.6157
RGB percentages3.9%, 22.7%, 61.6%
HSLhsl(220.4, 88%, 32.7%)
HSV / HSBhsv(220.4, 93.6%, 61.6%)
CMYK93.6%, 63.1%, 0%, 38.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer670,365
CSS custom property--colour: #0A3A9D;

Brightness & contrast

Relative luminance0.05525WCAG 2.x, 0 is black and 1 is white
Perceived brightness69.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.98:1
Contrast with white9.98:1WCAG normal text: AAA
Contrast with black2.1:1WCAG normal text: Fail
Greyscale equivalent#373737
Inverted#F5C562

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0049A0no red cones; affects about 1% of men; ΔE 11.7 from the original
Deuteranopia#003C9Bno green cones; the most common form, about 1% of men; ΔE 3.1 from the original
Tritanopia#005466no blue cones; rare, and affects men and women equally; ΔE 58.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.98:1WCAG large text: AAA
Contrast with black, large text2.1:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 15.7Midnight blue · ΔE 15.7Slate blue · ΔE 19.8Rebecca purple · ΔE 20.3Royal blue · ΔE 21.1Indigo · ΔE 27
Nearest named CSS colourDark slateblue (#483D8B)ΔE 15.7, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#9D6D0A
Analogous#0A839D, #240A9D
Triadic#9D0A3A, #3A9D0A
Split complementary#9D240A, #839D0A
Tetradic#9D0A83, #9D6D0A, #0A9D24

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7CA4F7
Lighter +30%#4C83F4
Lighter +20%#1C62F1
Lighter +10%#0D4CCD
Darker −10%#07286D
Darker −20%#04173D
Darker −30%#01050D
Darker −40%#000000
More saturated +25%#0037A7
Less saturated −25%#1F4188

Channel breakdown

R10
G58
B157
Red10 (3.9%)
Green58 (22.7%)
Blue157 (61.6%)
Hue220.41°
Saturation (HSL)88.02%
Lightness32.75%
Dominant channelBlue
Hex per channelR 0A · G 3A · B 9D

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Every value on this page was computed from “0a3a9d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.