Ultramarine Blue Color
Ultramarine Blue is a blue color with hex code #1805DB. This page covers its meaning, all color values, harmonies, colors that go with ultramarine blue, shades, tints, similar colors, CSS examples, FAQs, and WCAG contrast ratios.
Ultramarine Blue Color Values
What Does Ultramarine Blue Mean?
Ultramarine Blue belongs to the blue family of colors. Blue wins popularity surveys in every culture that runs them, and corporate design reflects it. Trust and stability are the usual words people reach for. Dark navies project authority, pale blues open a layout up, and almost nothing clashes with it. Ultramarine Blue sits at a mid-lightness, which keeps it readable on both white and black without much fuss.
In the ISCC-NBS color naming system, Ultramarine Blue is classified as a gray (nearest centroid: vivid violet, #9065CA). It is also known as Ultramarine.
Color Harmonies
Complementary
Analogous
Triadic
Colors That Go With Ultramarine Blue
Ultramarine Blue and #CADC04 are complements, parked opposite each other on the wheel. Together they hit maximum contrast, so a rough 70/30 split keeps the pairing from shouting.
Analogous neighbors — #045EDC and #8204DC, which sit beside ultramarine blue on the wheel. Pairings like this feel calm and settled, which suits backgrounds and gradients.
For an energetic three-color palette, pair ultramarine blue with triadic partners #DC1604 and #04DC16. All three sit evenly spaced around the wheel, so the scheme stays lively without clashing.
Build and test these combinations in our Color Wheel Tool or check text readability with the Contrast Checker.
Tints and Shades
Tints (lighter)
Shades (darker)
Similar Colors
- Pure Blue —
#0203E2(Delta E 4) - MediumBlue —
#0000CD(Delta E 5) - True Blue —
#010FCC(Delta E 8) - Blue/purple —
#5A06EF(Delta E 10) - Rich Blue —
#021BF9(Delta E 10)
CSS Examples
.text { color: #1805DB; }
.background { background-color: #1805DB; }
.border { border: 2px solid #1805DB; }
.shadow { box-shadow: 0 4px 6px #1805DB40; }WCAG Contrast
Frequently Asked Questions
What is the hex code for ultramarine blue?
Ultramarine Blue has the hex code #1805DB. In RGB notation it is rgb(24, 5, 219), in HSL it is hsl(245, 96%, 44%), and its OKLCH value is 0.41, 0.274, 266.8.
What does the color ultramarine blue mean?
Blue-family colors like ultramarine blue carry distinct psychological associations. Ultramarine Blue belongs to the blue family of colors. Blue wins popularity surveys in every culture that runs them, and corporate design reflects it. Trust and stability are the usual words people reach for. Dark navies project authority, pale blues open a layout up, and almost nothing clashes with it. Ultramarine Blue sits at a mid-lightness, which keeps it readable on both white and black without much fuss.
What colors go with ultramarine blue?
Ultramarine Blue has three easy routes: its complement #CADC04 for punch, its neighbors #045EDC and #8204DC for something calmer, or triadic partners #DC1604 and #04DC16 when you want energy.
Is ultramarine blue a standard web color?
No — Ultramarine Blue is not a CSS keyword. Use its hex value #1805DB or any RGB/HSL equivalent in your stylesheets.
How do I make ultramarine blue lighter or darker?
To lighten ultramarine blue, add white to create tints; to darken it, add black to create shades. The tints and shades table above shows five computed steps of each, from #D6D2FE (lightest tint) to #040123 (darkest shade).
About Ultramarine Blue
Ultramarine Blue is classified as a Gray in the ISCC-NBS color naming system, within the Blue hue family. It has alternative names including Ultramarine. The color is recognized by XKCD, meodai.
Use our Color Converter to convert #1805DB to any other color format, or explore the Color Wheel to find harmonious color combinations.