Palettes / Colors / #166DDF

#166DDF — Vivid Blue

#166DDF is a blue color we call Vivid 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 #166DDF 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.

#166DDF is a cool blue color associated with trust, calm and professionalism. It is saturated enough to be the accent — buttons, highlights and calls to action — while neutrals do the quiet work around it.

Its strongest partner is its complement #DF8816; it also sits naturally between #16D1DF and #2316DF. 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 9% · Green 43% · Blue 87%

Cyan 90% · Magenta 51% · Yellow 0% · Key 13%

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

Previews

CSS code for #166DDF

.text { color: #166DDF; }
.background { background-color: #166DDF; }
.border { border: 3px solid #166DDF; }
.text-rgb { color: rgb(22, 109, 223); }
.text-hsl { color: hsl(214, 82%, 48%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #166DDF; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(22, 109, 223, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #166DDF; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(22, 109, 223, 0.8); }

HTML: <p style="color:#166DDF">Text here</p> · <div style="background-color:#166DDF">Div content here</div>

Shades of #166DDF

Tints of #166DDF

Tones of #166DDF

Color harmonies

Complementary — #DF8816:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #166DDF: #FFFFFF.

Semi-transparent (opacity) text on #166DDF

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 #166DDF 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 #166DDF 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

← #166DDE  ·  #166DE0 →

Frequently asked questions

What color is #166DDF?

#166DDF is Vivid Blue, a blue color (RGB 22, 109, 223). Its closest standard named color is RoyalBlue.

What is the RGB and HSL of #166DDF?

#166DDF is RGB 22, 109, 223 — HSL 214°, 82%, 48% — CMYK 90%, 51%, 0%, 13%.

What colors go with #166DDF?

Its complement is #DF8816; analogous partners are #16D1DF and #2316DF. It also appears in 6+ palettes in our collection.

Can I use #166DDF for text?

White text on #166DDF has a contrast ratio of 4.90:1 (passes WCAG AA); black text gives 4.29:1.