Cobalt Shadow Clear (#213B6E) belongs to the blue family — hue 220°, 54% saturation, 28% lightness. Copy the hex, RGB, or HSL value above, or paste the CSS custom property below into your stylesheet to reference this color directly.
:root { --colorarchive-cobalt-shadow-clear: #213B6E; --colorarchive-cobalt-shadow-clear-hsl: hsl(220, 54%, 28%); --colorarchive-cobalt-shadow-clear-rgb: rgb(33, 59, 110); }
Let AI suggest alternative poetic names for this color in English and Chinese.
Defense · Aviation · Higher Education
Gold for prestige, white for sharp readability, electric blue for energy
Perfect for dark mode backgrounds and headers. Navy is softer than black and adds character. Pair with bright accents for contrast.
Navy and midnight blue symbolize authority, intelligence, and tradition. The color of uniforms, institutions, and power.
The most-loved color on the planet, and the most overused.
Blue is the rarest pigment in the natural world — and so, historically, the most expensive. Ultramarine, ground from lapis lazuli mined only in Afghanistan, was worth more than gold in Renaissance Europe; Vermeer's bills were enormous because of how much he used. Egyptian blue (the first synthetic pigment, ~3000 BCE) was lost for centuries and rediscovered in the 19th. Prussian blue (1704) democratized blue overnight; Yves Klein's IKB (1960) re-aristocratized it.
In ancient Egypt blue was the color of the Nile and the heavens — sacred, protective. In China blue-and-white porcelain (qinghua) defined export ceramics for 600 years. In Mediterranean traditions blue wards off the evil eye. In post-WWII America, blue became the corporate default ('IBM blue'); in Japan, indigo (ai) is the centuries-old workwear dye that became the ground tone of an entire textile tradition. Across the world blue is consistently rated the most-liked color — sometimes by 35% margins.
Facebook is blue because Mark Zuckerberg is red-green colorblind. IBM's blue dates to 1947. Levi's blue is the natural color of indigo on cotton. Twitter Blue (#1DA1F2) defined social-media blue for a decade before X scrapped it. Pixar's Up famously runs on a single complementary palette built on blue. The blue checkmark, the blue link, the blue 'send' button — blue has become the default color of digital trust, to the point of being a UX cliché.
Blue recedes — physically, the eye focuses blue light slightly behind the retina, which makes blue elements feel deep or distant. It reads as trustworthy, calm, corporate, and (at the cool end) cold. Light blues read airy and clinical; mid blues are the default for tech and finance; deep blues read as luxurious or naval. The omnipresence of blue in software is real: most enterprise UIs reach for it because it offends the fewest stakeholders, which is also the reason it can feel like the absence of a real choice.
A deep, weighted version of the hue — formal, considered, and pairs especially well with off-white and warm metallic accents.
Lightness band: At this depth the hue starts behaving like a neutral — it can substitute for black in many contexts while still carrying a faint chromatic temperature. It pairs especially well with off-whites and warm metallics.
Saturation band: The clear, mid-saturation register is the most common identity sweet spot — saturated enough to register as a 'real' color, restrained enough not to fight typography or photography placed over it.
Within the public brand-guidelines reference catalog, these are the closest matches to #213B6E.
From the cultural-palette catalog, these regions feature a color close to #213B6E.
Instead of stopping at one swatch, use nearby, opposite, and tonal neighbors to branch into a broader palette.
Base: Cobalt Shadow Clear #213B6E Lighter companion: Cobalt Dusk Clear #284786 Darker companion: Cobalt Nocturne Clear #172A4F Complementary counterpoint: Apricot Shadow Clear #6E5421 Analogous lead: Amethyst Shadow Clear #27216E Analogous echo: Azure Shadow Clear #21546E Triadic +120°: Garnet Shadow Clear #6E213B Triadic +240°: Moss Shadow Clear #3B6E21 Split-comp +150°: Ruby Shadow Clear #6E2E21 Split-comp +210°: Honey Shadow Clear #616E21
See how Cobalt Shadow Clear compares side by side with related colors.
The closest archive matches by hue, saturation, and lightness.
Archive colors that meet WCAG contrast standards when paired with this color. Use as text-on-background or background-on-text.
How this color appears with different color vision deficiencies.
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