Dark Blue-gray (#666699)

HEX, RGB, HSL, CMYK values + mood/style/use-case color tags. Use this page to keep your colors consistent across web and print.

Preview

Sample Text

This is how text may look on this color.

Best text color: #FFFFFF
Contrast vs white: 5.35:1 — vs black: 3.93:1

Color values

HEX #666699
RGB rgb(102, 102, 153)
HSL hsl(240, 33%, 60%)
CMYK cmyk( 33.33, 33.33, 0, 40 )

Convert this color Check contrast Extract from image Resize/Compress image

Tags

Mood

Style

Muted (190) Cool (180)

Use case

Text (210) Print (170)

Tip: tags are heuristic suggestions (helpful for browsing and inspiration).

Color Harmonies

Colors that pair well with #666699 based on color theory relationships.

Complementary

The color directly opposite on the color wheel — creates maximum contrast and vibrance.

Dark Blue-gray
#666699 Base

#999966

Analogous

Colors adjacent on the wheel — naturally harmonious and pleasing to the eye.

Dark Blue-gray
#666699 Base

#668099

#806699

Triadic

Three colors equally spaced 120° apart — bold, balanced, and visually rich.

Dark Blue-gray
#666699 Base

Copper Rose
#996666

#669966

Split-Complementary

Two colors flanking the complement — high contrast with less tension than full complementary.

Dark Blue-gray
#666699 Base

#998066

#809966

Tetradic (Square)

Four colors at 90° intervals — rich variety, best when one color dominates.

Dark Blue-gray
#666699 Base

#996680

#999966

#669980

Monochromatic

Shades and tints of the same hue — cohesive, elegant, and easy to work with.

Dark Blue-gray
#666699 Base

#29293D

#47476B

#565681

#7E7EA9

#9494B8

#C2C2D6

Shades & Tints

Darker shades and lighter tints of Dark Blue-gray, generated by adjusting lightness while keeping the same hue and saturation.

Shades (darker)

— #0A0A0F

— #1D1D2B

— #2F2F46

— #414162

— #54547D

Dark Blue-gray #666699 Base

— #8282AB

— #9D9DBE

— #B9B9D0

— #D4D4E2

— #F0F0F5

CSS & SCSS Snippets

Ready-to-use code snippets for #666699. Click the copy button to copy any snippet to your clipboard.

/* Background */
.element {
    background-color: #666699;
}

/* Text */
.element {
    color: #666699;
}

/* Border */
.element {
    border: 1px solid #666699;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #666699,
        #BBBB77
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #666699,
        #BBBB77
    );
}

// SCSS variable
$dark-blue-gray: #666699;

// With RGB channels (useful for rgba() usage)
$dark-blue-gray-r: 102;
$dark-blue-gray-g: 102;
$dark-blue-gray-b: 153;

// Usage
.element {
    background-color: $dark-blue-gray;
    color: rgba($dark-blue-gray-r, $dark-blue-gray-g, $dark-blue-gray-b, 0.8);
}

Color Blindness Simulation

How Dark Blue-gray appears to people with different types of color vision deficiency.

Normal Vision #666699 How the color appears with full color vision.

Deuteranopia #666699 Deuteranopia affects ~8% of males. Green cones are absent, making it difficult to distinguish red from green. The most common form of color blindness.

Protanopia #666699 Protanopia affects ~1% of males. Red cones are absent, causing reds to appear dark and indistinguishable from greens and browns.

Tritanopia #5C6E6E Tritanopia is rare (~0.003%). Blue cones are absent, making blue and yellow difficult to distinguish. Blues may appear green, yellows appear pink.

Achromatopsia #6B6B6B Achromatopsia is complete color blindness. The world is seen entirely in shades of grey. Affects ~1 in 30,000 people.

Similar Named Colors

The closest named colors to Dark Blue-gray ranked by perceptual difference (Delta-E 2000 — lower = more similar).

Dark Blue-gray #666699 Base

UCLA Blue #536895 ΔE 6.03

Liberty #545AA7 ΔE 6.86

Toolbox #746CC0 ΔE 7.56

Rhythm #777696 ΔE 7.90

How to use this color

Copy HEX for CSS and design tools, or RGB/HSL for UI adjustments.
Use CMYK when preparing print assets (posters, packaging, brochures).
Check contrast before using it for text or important UI elements.