HEX Color Code #0D3FAB

The deep blue hue #0D3FAB delivers confident visual weight across interfaces. Its balanced RGB and HSL values make it ideal for building cohesive blue-themed web palettes.

What Color Is #0D3FAB?

At 221° on the hue wheel, #0D3FAB lands firmly in the blue family. Its 86% saturation gives it a vivid, attention-grabbing quality, while 36% lightness positions it as a deep variant — well-suited for dark-mode surfaces and high-contrast elements.

Color Meaning of #0D3FAB

Colors in the blue family are associated with trust, reliability, and professionalism. As a deep variant, #0D3FAB amplifies those associations with depth and gravity, lending authority to any composition.

Where to Use HEX Code #0D3FAB

Hero sections and full-width banners where deep blue tones anchor the page hierarchy

CTA buttons and interactive elements — the deep depth ensures visibility against light backgrounds

Navigation bars and sidebar accents that need to feel grounded and persistent

Data visualization charts where this blue shade differentiates data series coherently

Icon fills and badge backgrounds that require consistent recognition across screen sizes

Email template accents where rendering fidelity across mail clients matters

Similar HEX Color Codes

#0030BA

#005892

#006288

Complementary teal tone for palette coordination

#3A127E

Nearby color value offering slightly different brightness

#0076E2

#4E00EC

Adjacent shade useful for gradient transitions

#588A60

Comparable green alternative with distinct character

HEX Code #0D3FAB in Design Systems

To implement #0D3FAB effectively in a design system, define it as a CSS custom property: :root { --color-blue-deep: #0D3FAB; }. This single definition propagates to every component referencing the token, and a palette update requires changing just one line.

Accessibility testing is essential. With a perceived brightness of 60/255, this shade requires white or light text for adequate WCAG contrast — aim for 4.5:1 minimum on body text. Use it as a background or accent rather than text on dark surfaces.

FAQ About HEX Color Code #0D3FAB

What color is #0D3FAB?

#0D3FAB produces a deep blue tone. The RGB breakdown (13, 63, 171) shows how the three light channels combine to create this specific blue hue at 221° on the color wheel.

Is #0D3FAB a dark or light color?

#0D3FAB registers as a dark color at 60/255 perceived brightness. In practical terms, white (#FFFFFF) or very light text will provide the best readability.

What colors go well with #0D3FAB?

Complementary pairing (≈41° hue) creates energetic contrast with #0D3FAB. Split-complementary (±150°) adds variety with less tension. Monochromatic schemes — lighter and darker blue shades — are the safest harmonious option.

Can I use #0D3FAB for branding?

#0D3FAB can serve as a primary or secondary brand color. Before committing, verify it renders well in both RGB (screens) and CMYK (print), test it against competitor palettes for differentiation, and confirm it meets WCAG contrast requirements in all planned applications.

How do I convert #0D3FAB to other color formats?

Convert #0D3FAB to RGB(13, 63, 171) by splitting the hex into three pairs and converting each from base-16 to base-10. HSL(221°, 86%, 36%) is derived from the RGB values using the standard algorithm. Visit our HEX to HSL converter for additional formats.