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Recognised as Colour

#0A57D0

  • #0A57D0
  • Blue
  • Dark
  • Nearest: Royal blue

#0A57D0 is a blue with RGB values 10, 87, 208 and HSL 217°, 91%, 43%. It is a dark colour, so white text on it reaches 6.4:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#0A57D0#0A57D0
HEX#0A57D0
RGBrgb(10, 87, 208)
RGB (0–1)0.0392, 0.3412, 0.8157
RGB percentages3.9%, 34.1%, 81.6%
HSLhsl(216.7, 90.8%, 42.7%)
HSV / HSBhsv(216.7, 95.2%, 81.6%)
CMYK95.2%, 58.2%, 0%, 18.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer677,840
CSS custom property--colour: #0A57D0;

Brightness & contrast

Relative luminance0.11435WCAG 2.x, 0 is black and 1 is white
Perceived brightness97 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.39:1
Contrast with white6.39:1WCAG normal text: AA
Contrast with black3.29:1WCAG normal text: Fail
Greyscale equivalent#4F4F4F
Inverted#F5A82F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0068D4no red cones; affects about 1% of men; ΔE 12.3 from the original
Deuteranopia#0057CEno green cones; the most common form, about 1% of men; ΔE 1.3 from the original
Tritanopia#00768Bno blue cones; rare, and affects men and women equally; ΔE 67.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.39:1WCAG large text: AAA
Contrast with black, large text3.29:1WCAG large text: AA

Named colours

Royal blue · ΔE 8Slate blue · ΔE 14.5Medium slateblue · ΔE 18.6Medium purple · ΔE 25.1Dodgerblue · ΔE 26Rebecca purple · ΔE 27.1
Nearest named CSS colourRoyal blue (#4169E1)ΔE 8.01, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D0830A
Analogous#0ABAD0, #200AD0
Triadic#D00A57, #57D00A
Split complementary#D0200A, #BAD00A
Tetradic#D00ABA, #D0830A, #0AD020

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#ABCAFB
Lighter +30%#7AABF9
Lighter +20%#4A8DF6
Lighter +10%#196EF4
Darker −10%#08439F
Darker −20%#052E6F
Darker −30%#031A3E
Darker −40%#01060D
More saturated +25%#0055DA
Less saturated −25%#255DB5

Channel breakdown

R10
G87
B208
Red10 (3.9%)
Green87 (34.1%)
Blue208 (81.6%)
Hue216.67°
Saturation (HSL)90.83%
Lightness42.75%
Dominant channelBlue
Hex per channelR 0A · G 57 · B D0

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Every value on this page was computed from “0a57d0” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.