Nautilus
Also known as: Navy Peony , Midnight Sleigh , Madison , Academic Blue
Expect calm and trustworthy associations from Nautilus, a rich blue suited to corporate branding and SaaS products. Because it leans cool, balancing it with a brown keeps a palette from feeling one-note. On white it reads clearly at 11.17:1 contrast, safe for body text under WCAG AA.
Reference
Nautilus color codes
- HEX
- #273C5A
- RGB
- rgb(39, 60, 90)
- RGBA
- rgba(39, 60, 90, 1)
- HSL
- hsl(215, 40%, 25%)
- HSV
- hsv(215, 57%, 35%)
- CMYK
- cmyk(57%, 33%, 0%, 65%)
- LAB
- lab(24.7 -1.0 -20.9)
- OKLCH
- oklch(35.3% 0.059 257.3)
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 10.8
- RAL 5003: Sapphire blue #2A3756 · ΔE 3.2 · 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 Nautilus 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 Nautilus
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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 Nautilus 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 11.17:1
AA pass AAA pass AA large pass
Aa on black
contrast 1.88:1
AA fail AAA fail AA large fail
Best text color on a Nautilus background: #ffffff
Palettes
Palettes featuring Nautilus
Nautilus with its complement
Soft neighbors of Nautilus
Nautilus triad
Explore
Similar colors
- Pi #314159 · ΔE 2.8
- Nightlife #27426B · ΔE 3.4
- Poseidon #143C5D · ΔE 3.9
- Blue Funk #2D4470 · ΔE 4.4
- Aegean Blue #1B416F · ΔE 4.5
- Bonne Nuit #3A4866 · ΔE 4.7
Looking for maximum contrast instead? The complement of Nautilus is closest to Pineapple .
FAQ
Nautilus FAQs
What color is Nautilus?
Nautilus is a dark blue with the hex code #273C5A. In HSL terms it has a hue of 215°, 40% saturation, and 25% lightness.
What is the hex code for Nautilus?
The hex code for Nautilus is #273C5A. In RGB it's rgb(39, 60, 90), and in CMYK it's cmyk(57%, 33%, 0%, 65%).
What colors go well with Nautilus?
Nautilus pairs naturally with brown tones from its complementary harmony. Its own tints and shades always work as a monochrome scheme.
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