Dark Crypt
Also known as: Midnight Sky , Bank Blue , Rhino , Soft Steel
Part of the blue family, Dark Crypt pairs a rich base with a steady and dependable presence. It belongs in finance apps and trust-driven interfaces. Because it leans cool, balancing it with a brown keeps a palette from feeling one-note. It's dark enough to use for text on white backgrounds (9.63:1, passes WCAG AA).
Reference
Dark Crypt color codes
- HEX
- #3F4551
- RGB
- rgb(63, 69, 81)
- RGBA
- rgba(63, 69, 81, 1)
- HSL
- hsl(220, 12%, 28%)
- HSV
- hsv(220, 22%, 32%)
- CMYK
- cmyk(22%, 15%, 0%, 68%)
- LAB
- lab(29.1 -0.3 -8.1)
- OKLCH
- oklch(39.0% 0.022 264.3)
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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neutral, leaning cool
subtle blue undertone in this near-neutral
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: darkslategray #2F4F4F · ΔE 13.8
- RAL 7024: Graphite grey #474A50 · ΔE 3.6 · 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 Dark Crypt 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: Works as a base layer or outerwear tone that lets brighter pieces do the talking.
- 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.
- Fashion: One garment in this color carries an outfit; two starts to compete.
Copy as: every ecosystem
Variations
Tints, shades, and tones of Dark Crypt
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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 Dark Crypt 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 9.63:1
AA pass AAA pass AA large pass
Aa on black
contrast 2.18:1
AA fail AAA fail AA large fail
Best text color on a Dark Crypt background: #ffffff
Palettes
Palettes featuring Dark Crypt
Dark Crypt with its complement
Soft neighbors of Dark Crypt
Dark Crypt triad
Explore
Similar colors
- Inkblot #393F4B · ΔE 2.0
- Madonna #3F4250 · ΔE 2.4
- Lava Stone #3C4151 · ΔE 2.7
- Isolation #494D55 · ΔE 3.5
- Abyssal #404C57 · ΔE 3.8
- Arsenic #3B444B · ΔE 3.9
Looking for maximum contrast instead? The complement of Dark Crypt is closest to Batch Brew .
FAQ
Dark Crypt FAQs
What color is Dark Crypt?
Dark Crypt is a dark blue with the hex code #3F4551. In HSL terms it has a hue of 220°, 12% saturation, and 28% lightness.
What is the hex code for Dark Crypt?
The hex code for Dark Crypt is #3F4551. In RGB it's rgb(63, 69, 81), and in CMYK it's cmyk(22%, 15%, 0%, 68%).
What colors go well with Dark Crypt?
Dark Crypt pairs naturally with brown tones from its complementary harmony. Its own tints and shades always work as a monochrome scheme.
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