Palettes / Colors / #5166CD

#5166CD — Blue

#5166CD is a blue color we call Blue, closest to the named color RoyalBlue (#4169E1). It belongs to the blue family.

Color name

Closest CSS keyword: royalblue (#4169E1) — not an exact match. CSS royalblue gives you #4169E1, a different color; use #5166CD when you need this exact shade.

Sources: common names follow widely used color-name references; CSS keywords and their hex values follow the CSS Color specification.

#5166CD is a cool blue color associated with trust, calm and professionalism. It sits comfortably in the middle: usable for large areas in soft schemes, or as a supporting color beside something stronger.

Its strongest partner is its complement #CDB851; it also sits naturally between #51A3CD and #7A51CD. In the palettes below you can see it working alongside real color combinations from our collection.

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Color values

RGB & CMYK percentages

Red 32% · Green 40% · Blue 80%

Cyan 60% · Magenta 50% · Yellow 0% · Key 20%

CMYK values are unprofiled approximations for screen reference — not a print-proofing guarantee.

Previews

CSS code for #5166CD

.text { color: #5166CD; }
.background { background-color: #5166CD; }
.border { border: 3px solid #5166CD; }
.text-rgb { color: rgb(81, 102, 205); }
.text-hsl { color: hsl(230, 55%, 56%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #5166CD; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(81, 102, 205, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #5166CD; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(81, 102, 205, 0.8); }

HTML: <p style="color:#5166CD">Text here</p> · <div style="background-color:#5166CD">Div content here</div>

Shades of #5166CD

Tints of #5166CD

Tones of #5166CD

Color harmonies

Complementary — #CDB851:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #5166CD: #FFFFFF.

Semi-transparent (opacity) text on #5166CD

Text set with opacity blends into the background, so its real contrast is lower than the solid ratios above. Choose a text color and an opacity to see the blended color and its true ratio:

How #5166CD looks with color blindness

Simulated with standard Machado color-vision-deficiency matrices — useful when this color carries meaning in charts, maps or interfaces:

Closest design-system colors

The nearest matches in the Tailwind CSS, Material Design and Bootstrap palettes — handy when you need a framework class instead of a raw hex:

Palettes with a similar color

These palettes use a close neighbour of #5166CD rather than the exact color:

Similar colors

The closest colors that actually appear in our palette collection — click any to open its page:

Browse neighbouring colors

← #5166CC  ·  #5166CE →

Frequently asked questions

What color is #5166CD?

#5166CD is Blue, a blue color (RGB 81, 102, 205). Its closest standard named color is RoyalBlue.

What is the RGB and HSL of #5166CD?

#5166CD is RGB 81, 102, 205 — HSL 230°, 55%, 56% — CMYK 60%, 50%, 0%, 20%.

What colors go with #5166CD?

Its complement is #CDB851; analogous partners are #51A3CD and #7A51CD. It also appears in 6+ palettes in our collection.

Can I use #5166CD for text?

White text on #5166CD has a contrast ratio of 5.08:1 (passes WCAG AA); black text gives 4.13:1.