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Recognised as Colour

#51A9D7

  • #51A9D7
  • Blue
  • Dark
  • Nearest: Deep skyblue

#51A9D7 is a blue with RGB values 81, 169, 215 and HSL 201°, 63%, 58%. It is a dark colour, so black text on it reaches 8:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#51A9D7#51A9D7
HEX#51A9D7
RGBrgb(81, 169, 215)
RGB (0–1)0.3176, 0.6627, 0.8431
RGB percentages31.8%, 66.3%, 84.3%
HSLhsl(200.6, 62.6%, 58%)
HSV / HSBhsv(200.6, 62.3%, 84.3%)
CMYK62.3%, 21.4%, 0%, 15.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,351,895
CSS custom property--colour: #51A9D7;

Brightness & contrast

Relative luminance0.35032WCAG 2.x, 0 is black and 1 is white
Perceived brightness154.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.01:1
Contrast with white2.62:1WCAG normal text: Fail
Contrast with black8.01:1WCAG normal text: AAA
Greyscale equivalent#9A9A9A
Inverted#AE5628

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#93A7D9no red cones; affects about 1% of men; ΔE 17.9 from the original
Deuteranopia#809AD6no green cones; the most common form, about 1% of men; ΔE 18.9 from the original
Tritanopia#00B5B8no blue cones; rare, and affects men and women equally; ΔE 30.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.62:1WCAG large text: Fail
Contrast with black, large text8.01:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 14.1Light skyblue · ΔE 14.3Steel blue · ΔE 15.8Sky blue · ΔE 16.8Light steelblue · ΔE 23.3Light slate grey · ΔE 24.7
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 14.15, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D77F51
Analogous#51D7C2, #5166D7
Triadic#D751A9, #A9D751
Split complementary#D75166, #D7C251
Tetradic#C251D7, #D77F51, #66D751

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F7FBFD
Lighter +30%#CDE6F4
Lighter +20%#A4D2EA
Lighter +10%#7ABDE1
Darker −10%#2E93C7
Darker −20%#24749E
Darker −30%#1B5674
Darker −40%#11374B
More saturated +25%#36B1F2
Less saturated −25%#6CA1BC

Channel breakdown

R81
G169
B215
Red81 (31.8%)
Green169 (66.3%)
Blue215 (84.3%)
Hue200.6°
Saturation (HSL)62.62%
Lightness58.04%
Dominant channelBlue
Hex per channelR 51 · G A9 · B D7

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Every value on this page was computed from “51a9d7” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.