Slumber
Also known as: Boat Blue , Galaxy Blue , St. Tropez , Overtake
Slumber holds a rich position in the blue range and reads as cool and professional. You'll see it used for corporate branding and SaaS products. Set it against a brown accent when you want the combination to pop. Accessibility-wise, it clears AA for text on white at 8.14:1.
Reference
Slumber color codes
- HEX
- #2D517C
- RGB
- rgb(45, 81, 124)
- RGBA
- rgba(45, 81, 124, 1)
- HSL
- hsl(213, 47%, 33%)
- HSV
- hsv(213, 64%, 49%)
- CMYK
- cmyk(64%, 35%, 0%, 51%)
- LAB
- lab(33.4 -2.2 -28.8)
- OKLCH
- oklch(42.9% 0.083 253.9)
Analysis
Color intelligence
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Gamut
The full range of colors a device or space can show. sRGB is the common screen gamut; Display P3 is wider. A color outside a gamut cannot be shown accurately there and must be mapped inward.Full glossary entry →Displays accurately on every screen and translates well to print.
Temperature
Undertone
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cool
Nearest standard colors
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Delta E (ΔE)
A measure of how different two colors look. Below 1 the difference is invisible to almost everyone; below 2.3 most people can't tell them apart; above 10 they are clearly different colors. We use CIEDE2000, the modern standard.Full glossary entry →
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Delta E (ΔE)
A measure of how different two colors look. Below 1 the difference is invisible to almost everyone; below 2.3 most people can't tell them apart; above 10 they are clearly different colors. We use CIEDE2000, the modern standard.Full glossary entry →- CSS: darkslateblue #483D8B · ΔE 11.6
- RAL 5017: Traffic blue #0E518D · ΔE 3.3 · approximate
RAL values are widely published approximations of the physical standard. For Pantone-adjacent workflows, match by eye against a physical fan deck. Pantone's values are proprietary and device-dependent, so we don't print lookups.
Where Slumber works
- Web & UI: Dark enough for body text and icons on white backgrounds. It passes WCAG AA as-is.
- Interiors: Strong for a whole room, excellent in doses: an accent wall, cabinetry, or a statement chair.
- Fashion: Wears best as the statement piece, a top, scarf, or shoes, against neutral basics.
- Branding: Sits in the trust register: a natural primary for finance, health, and B2B brands.
- Web & UI: A supporting-cast color for UI: chart fills, tags, and empty-state illustrations, but not text.
- Branding: A secondary brand color by nature: it supports a stronger primary and shines in illustration.
Copy as: every ecosystem
Variations
Tints, shades, and tones of Slumber
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Tint
A color mixed with white, which raises its lightness. Pink is a tint of red. Tints feel softer and more open than the base color.Full glossary entry →
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Tint
A color mixed with white, which raises its lightness. Pink is a tint of red. Tints feel softer and more open than the base color.Full glossary entry →Tints (lighter)
Shades (darker)
Harmonies
Color harmonies
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Complementary colors
Two colors opposite each other on the wheel. They create the strongest contrast and make each other look more intense, so they work best used unevenly.Full glossary entry →
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Complementary colors
Two colors opposite each other on the wheel. They create the strongest contrast and make each other look more intense, so they work best used unevenly.Full glossary entry →Palettes built from Slumber by rotating its hue in OKLCH space. Click any swatch to copy its hex code.
Complementary
Analogous
Triadic
Split-complementary
Tetradic
Monochromatic
Accessibility
Contrast & accessibility
Aa on white
contrast 8.14:1
AA pass AAA pass AA large pass
Aa on black
contrast 2.58:1
AA fail AAA fail AA large fail
Best text color on a Slumber background: #ffffff
Palettes
Palettes featuring Slumber
Slumber with its complement
Soft neighbors of Slumber
Slumber triad
Explore
Similar colors
- Assassin #2D4F83 · ΔE 1.8
- Night Mode #234E86 · ΔE 2.0
- Nautical #2E4A7D · ΔE 3.2
- Dragonfly #314A76 · ΔE 3.3
- Naval Blue #384B6B · ΔE 4.6
- Dark Blue #315B7D · ΔE 4.6
Looking for maximum contrast instead? The complement of Slumber is closest to Pineapple .
FAQ
Slumber FAQs
What color is Slumber?
Slumber is a dark blue with the hex code #2D517C. In HSL terms it has a hue of 213°, 47% saturation, and 33% lightness.
What is the hex code for Slumber?
The hex code for Slumber is #2D517C. In RGB it's rgb(45, 81, 124), and in CMYK it's cmyk(64%, 35%, 0%, 51%).
What colors go well with Slumber?
Slumber pairs naturally with brown tones from its complementary harmony. Its own tints and shades always work as a monochrome scheme.
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