#4278D0 Hex Color
Cool blue with confident clarity
#4278d0 is a fairly saturated, cool blue with a clean, dependable presence. Its medium lightness supports trust and control, making it effective for finance, technology, healthcare, and government branding. Use it as a supporting tone beside navy or warm gray, or for interface accents. The hex code #4278d0 also supports clear black text at about 4.8:1 contrast.
Questions about #4278d0
What is #4278d0 in RGB, HSL and CMYK?
In RGB, #4278d0 is rgb(66, 120, 208), in HSL hsl(217, 60%, 54%) and in CMYK 68%, 42%, 0%, 18%.
What colors pair well with #4278d0?
#4278d0 pairs well with navy, warm gray, and white because these supporting tones balance its cool saturation without competing for attention, adding depth, softness, or clean contrast to dashboards and technology interfaces. Use warmer neutrals when the blue feels too crisp.
Does #4278d0 feel warm or cool?
#4278d0 reads as a cool blue because its blue component is much stronger than its red component, giving it a crisp, controlled character and a cooler impression rather than a warm, earthy one. It suits designs that need trust, focus, and a modern technical feel.
Is #4278d0 readable on white or black?
#4278d0 has a 4.34:1 contrast ratio on white and 4.82:1 on black. WCAG asks for 4.5:1 for body text and 3:1 for large text, so on white it works only for large text (24px, or 18.5px bold) and on black it works for body text. Try other pairs in the contrast checker.