Poseidon
Also known as: Blue Opal , Sir Edmund , Alpine Race , Blue Accolade
Poseidon holds a rich position in the blue range and reads as calm and trustworthy. You'll see it used for finance apps and trust-driven interfaces. Poseidon plays well with brown tones. The harmonies below show which ones. On white it reads clearly at 11.45:1 contrast, safe for body text under WCAG AA.
Reference
Poseidon color codes
- HEX
- #143C5D
- RGB
- rgb(20, 60, 93)
- RGBA
- rgba(20, 60, 93, 1)
- HSL
- hsl(207, 65%, 22%)
- HSV
- hsv(207, 78%, 36%)
- CMYK
- cmyk(78%, 35%, 0%, 64%)
- LAB
- lab(23.9 -4.5 -24.2)
- OKLCH
- oklch(34.6% 0.073 247.0)
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 12.6
- RAL 5001: Green blue #1F4764 · ΔE 4.1 · 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 Poseidon works
- Web & UI: Use it directly for text on light surfaces; it clears AA contrast without adjustment.
- Interiors: Use it where you want the eye to land: a front door, built-ins, or one bold wall.
- Fashion: One garment in this color carries an outfit; two starts to compete.
- Branding: The safest brand-primary family there is; differentiate with an unexpected accent.
- Web & UI: Use it decoratively for dividers, chart series, and illustration accents, and let neutrals carry the type.
- Branding: Best in a brand's supporting palette: packaging interiors, patterns, campaign accents.
Copy as: every ecosystem
Variations
Tints, shades, and tones of Poseidon
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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 Poseidon 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 11.45:1
AA pass AAA pass AA large pass
Aa on black
contrast 1.83:1
AA fail AAA fail AA large fail
Best text color on a Poseidon background: #ffffff
Palettes
Palettes featuring Poseidon
Poseidon with its complement
Soft neighbors of Poseidon
Poseidon triad
Explore
Similar colors
- Aegean Blue #1B416F · ΔE 3.7
- Nautilus #273C5A · ΔE 3.9
- Nightlife #27426B · ΔE 4.5
- Pi #314159 · ΔE 5.4
- Marine #042E60 · ΔE 5.9
- Blue Funk #2D4470 · ΔE 5.9
Looking for maximum contrast instead? The complement of Poseidon is closest to Pineapple .
FAQ
Poseidon FAQs
What color is Poseidon?
Poseidon is a dark blue with the hex code #143C5D. In HSL terms it has a hue of 207°, 65% saturation, and 22% lightness.
What is the hex code for Poseidon?
The hex code for Poseidon is #143C5D. In RGB it's rgb(20, 60, 93), and in CMYK it's cmyk(78%, 35%, 0%, 64%).
What colors go well with Poseidon?
Poseidon pairs naturally with brown tones from its complementary harmony. Its own tints and shades always work as a monochrome scheme.
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