Blue Hour
Also known as: UA Blue , Egyptian Blue , Royal Azure , International Blue
Part of the blue family, Blue Hour pairs a rich base with a cool and professional presence. It belongs in corporate branding and SaaS products. Blue Hour plays well with brown tones. The harmonies below show which ones. Accessibility-wise, it clears AA for text on white at 10.10:1.
Reference
Blue Hour color codes
- HEX
- #0034AB
- RGB
- rgb(0, 52, 171)
- RGBA
- rgba(0, 52, 171, 1)
- HSL
- hsl(222, 100%, 34%)
- HSV
- hsv(222, 100%, 67%)
- CMYK
- cmyk(100%, 70%, 0%, 33%)
- LAB
- lab(26.5 26.7 -68.5)
- OKLCH
- oklch(39.1% 0.195 262.9)
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. Vivid colors like this typically lose some intensity in CMYK print. Request a physical proof for brand-critical work.
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 8.6
- RAL 5002: Ultramarine blue #2B2C7C · ΔE 7.5 · 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 Blue Hour 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 Blue Hour
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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 Blue Hour 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 10.10:1
AA pass AAA pass AA large pass
Aa on black
contrast 2.08:1
AA fail AAA fail AA large fail
Best text color on a Blue Hour background: #ffffff
Palettes
Palettes featuring Blue Hour
Blue Hour with its complement
Soft neighbors of Blue Hour
Blue Hour triad
Explore
Similar colors
- Smalt #003399 · ΔE 2.6
- Bluebell #333399 · ΔE 4.1
- Denim #2243B6 · ΔE 4.6
- Space Dust #002299 · ΔE 5.2
- Dark Galaxy #0018A8 · ΔE 6.8
- Blueberry #464196 · ΔE 7.4
Looking for maximum contrast instead? The complement of Blue Hour is closest to Pineapple .
FAQ
Blue Hour FAQs
What color is Blue Hour?
Blue Hour is a dark blue with the hex code #0034AB. In HSL terms it has a hue of 222°, 100% saturation, and 34% lightness.
What is the hex code for Blue Hour?
The hex code for Blue Hour is #0034AB. In RGB it's rgb(0, 52, 171), and in CMYK it's cmyk(100%, 70%, 0%, 33%).
What colors go well with Blue Hour?
Blue Hour pairs naturally with brown tones from its complementary harmony. Its own tints and shades always work as a monochrome scheme.
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