#3333CC colour

#3333CC is a blue close to CSS mediumblue. RGB 51, 51, 204, HSL 240, 60%, 50%. White text passes AAA (8.45:1), black fails (2.49:1).

#3333CC

Nearest CSS name: mediumblue #0000cd (not an exact match)
Described as: a blue
Red, green, blue: 51, 51, 204
Web safe: Yes, one of the 216 web-safe colours
Luminance: 0.0743 (WCAG relative luminance, 0 is black, 1 is white)

Colour codes

HEX	`#3333cc`
HEX (short)	`#33c`
RGB	`rgb(51, 51, 204)`
RGB (percent)	`rgb(20% 20% 80%)`
HSL	`hsl(240, 60%, 50%)`
HSV / HSB	`hsv(240, 75%, 80%)`
HWB	`hwb(240 20% 20%)`
CMYK (naive)	`cmyk(75%, 75%, 0%, 20%)`
CIELAB (D50)	`lab(31.28% 41.32 -80.03)`
OKLCH	`oklch(44.19% 0.2256 272.28)`
Decimal	`3355596`

CMYK here is the plain formula with no colour profile, so treat it as a starting point; a printer's profile gives the real ink values. CIELAB uses a D50 white point, as CSS lab() does. HSV is not a CSS function, so it is shown for design apps only.

Contrast with white and black text

White text, 8.45:1The quick brown fox jumps over the lazy dog.

Black text, 2.49:1The quick brown fox jumps over the lazy dog.

Text	Ratio	AA normal (4.5)	AA large (3)	AAA normal (7)	AAA large (4.5)
White	8.45:1	Pass	Pass	Pass	Pass
Black	2.49:1	Fail	Fail	Fail	Fail

White text is the better choice on #3333CC (8.45:1). Ratios use the WCAG 2.2 formula; large text means at least 24px, or 18.66px bold. Check another pair.

Tints and shades

Mixed with white, then with black, in ten even steps (straight sRGB mixing, as most design tools do).

9%#4646d1 18%#5858d5 27%#6b6bda 36%#7d7ddf 45%#9090e3 55%#a2a2e8 64%#b5b5ec 73%#c7c7f1 82%#dadaf6 91%#ececfa

9%#2e2eb9 18%#2a2aa7 27%#252594 36%#202082 45%#1c1c6f 55%#17175d 64%#13134a 73%#0e0e38 82%#090925 91%#050513

Colour harmonies

Hue turned around the HSL colour wheel, saturation and lightness kept.

Complementary

The hue opposite on the colour wheel (180°).

#3333cc #cccc33

Analogous

Neighbours 30° either side.

#3380cc #3333cc #8033cc

Triadic

Three hues 120° apart.

#3333cc #cc3333 #33cc33

Split complementary

The two hues either side of the complement (150° and 210°).

#3333cc #cc8033 #80cc33

Tetradic (square)

Four hues 90° apart.

#3333cc #cc3380 #cccc33 #33cc80

How it looks with colour blindness

Normal vision#3333cc Protanopia#0054d0 Deuteranopia#0045c9 Tritanopia#00607d Achromatopsia#4d4d4d

Simulated with the Machado, Oliveira and Fernandes (2009) matrices at full severity, applied in linear RGB; achromatopsia shows the colour's luminance as grey. Milder forms (protanomaly, deuteranomaly) are far more common and shift colours less. Never use colour as the only way to carry meaning.

CSS

Text colour	`color: #3333cc;`
Background	`background-color: #3333cc;`
Border	`border: 1px solid #3333cc;`
Half transparent	`background-color: rgb(51 51 204 / 50%);`
Custom property	`--colour-main: #3333cc;`
Gradient to a darker shade	`background: linear-gradient(135deg, #3333cc, #1f1f7a);`
Gradient from a lighter tint	`background: linear-gradient(180deg, #8585e0, #3333cc);`
Text on this colour	`background-color: #3333cc; color: #fff;`

Similar named colours

Distance is measured in OKLab, scaled by 100; under about 2 is hard to tell apart side by side.

Convert #3333CC to other formats · Build a palette from it · Check contrast · All named colours

Colour names from CSS Color Module Level 4. Palette values from the Tailwind CSS v3 default palette (MIT licence) and the Material Design 2014 colour palette as published in Material Design Lite (Apache License 2.0). All other values are calculated from the hex code.