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Colour

#003FBB

  • #003FBB
  • Blue
  • Dark
  • Nearest: Slate blue

#003FBB is a blue with RGB values 0, 63, 187 and HSL 220°, 100%, 37%. It is a dark colour, so white text on it reaches 8.6:1 contrast (AAA for normal text). The nearest named colour is Slate blue.

Colour values

#003FBB#003FBB
HEX#003FBB
RGBrgb(0, 63, 187)
RGB (0–1)0, 0.2471, 0.7333
RGB percentages0%, 24.7%, 73.3%
HSLhsl(219.8, 100%, 36.7%)
HSV / HSBhsv(219.8, 100%, 73.3%)
CMYK100%, 66.3%, 0%, 26.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,315
CSS custom property--colour: #003FBB;

Brightness & contrast

Relative luminance0.07143WCAG 2.x, 0 is black and 1 is white
Perceived brightness79.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.65:1
Contrast with white8.65:1WCAG normal text: AAA
Contrast with black2.43:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#FFC044

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0054BFno red cones; affects about 1% of men; ΔE 15.6 from the original
Deuteranopia#0044B9no green cones; the most common form, about 1% of men; ΔE 5.2 from the original
Tritanopia#006177no blue cones; rare, and affects men and women equally; ΔE 70.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.65:1WCAG large text: AAA
Contrast with black, large text2.43:1WCAG large text: Fail

Named colours

Slate blue · ΔE 17.5Royal blue · ΔE 18Medium slateblue · ΔE 21.4Rebecca purple · ΔE 23.5Navy · ΔE 23.7Dark blue · ΔE 23.7
Nearest named CSS colourSlate blue (#6A5ACD)ΔE 17.45, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BB7C00
Analogous#009DBB, #1E00BB
Triadic#BB003F, #3FBB00
Split complementary#BB1E00, #9DBB00
Tetradic#BB009D, #BB7C00, #00BB1E

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#88B0FF
Lighter +30%#558EFF
Lighter +20%#226CFF
Lighter +10%#0050EE
Darker −10%#002E88
Darker −20%#001D55
Darker −30%#000B22
Darker −40%#000000
More saturated +25%#003FBB
Less saturated −25%#1747A4

Channel breakdown

R0
G63
B187
Red0 (0%)
Green63 (24.7%)
Blue187 (73.3%)
Hue219.79°
Saturation (HSL)100%
Lightness36.67%
Dominant channelBlue
Hex per channelR 00 · G 3F · B BB

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Every value on this page was computed from “003fbb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.