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Colour

#0A2181

  • #0A2181
  • Blue
  • Dark
  • Nearest: Midnight blue

#0A2181 is a blue with RGB values 10, 33, 129 and HSL 228°, 86%, 27%. It is a dark colour, so white text on it reaches 13.6:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#0A2181#0A2181
HEX#0A2181
RGBrgb(10, 33, 129)
RGB (0–1)0.0392, 0.1294, 0.5059
RGB percentages3.9%, 12.9%, 50.6%
HSLhsl(228.4, 85.6%, 27.3%)
HSV / HSBhsv(228.4, 92.2%, 50.6%)
CMYK92.2%, 74.4%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer663,937
CSS custom property--colour: #0A2181;

Brightness & contrast

Relative luminance0.02737WCAG 2.x, 0 is black and 1 is white
Perceived brightness50.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.57:1
Contrast with white13.57:1WCAG normal text: AAA
Contrast with black1.55:1WCAG normal text: Fail
Greyscale equivalent#232323
Inverted#F5DE7E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#003484no red cones; affects about 1% of men; ΔE 15 from the original
Deuteranopia#00287Fno green cones; the most common form, about 1% of men; ΔE 7.1 from the original
Tritanopia#003D4Fno blue cones; rare, and affects men and women equally; ΔE 57.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text13.57:1WCAG large text: AAA
Contrast with black, large text1.55:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 6.6Dark slateblue · ΔE 18.8Navy · ΔE 19.1Rebecca purple · ΔE 19.5Indigo · ΔE 19.9Dark blue · ΔE 23.2
Nearest named CSS colourMidnight blue (#191970)ΔE 6.58, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#816A0A
Analogous#0A5C81, #2F0A81
Triadic#810A21, #21810A
Split complementary#812E0A, #5C810A
Tetradic#810A5C, #816A0A, #0A812E

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6480F3
Lighter +30%#3559EF
Lighter +20%#1139E0
Lighter +10%#0E2DB0
Darker −10%#061552
Darker −20%#030922
Darker −30%#000000
Darker −40%#000000
More saturated +25%#001B8B
Less saturated −25%#1B2C70

Channel breakdown

R10
G33
B129
Red10 (3.9%)
Green33 (12.9%)
Blue129 (50.6%)
Hue228.4°
Saturation (HSL)85.61%
Lightness27.25%
Dominant channelBlue
Hex per channelR 0A · G 21 · B 81

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Every value on this page was computed from “0a2181” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.