Palettes / Colors / #423FEE

#423FEE — Vivid Blue

#423FEE 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 #423FEE 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.

#423FEE 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 #EBEE3F; it also sits naturally between #3F94EE and #993FEE. 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 26% · Green 25% · Blue 93%

Cyan 72% · Magenta 74% · Yellow 0% · Key 7%

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

Previews

CSS code for #423FEE

.text { color: #423FEE; }
.background { background-color: #423FEE; }
.border { border: 3px solid #423FEE; }
.text-rgb { color: rgb(66, 63, 238); }
.text-hsl { color: hsl(241, 84%, 59%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #423FEE; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(66, 63, 238, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #423FEE; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(66, 63, 238, 0.8); }

HTML: <p style="color:#423FEE">Text here</p> · <div style="background-color:#423FEE">Div content here</div>

Shades of #423FEE

Tints of #423FEE

Tones of #423FEE

Color harmonies

Complementary — #EBEE3F:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #423FEE: #FFFFFF.

Semi-transparent (opacity) text on #423FEE

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 #423FEE 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 #423FEE 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

← #423FED  ·  #423FEF →

Frequently asked questions

What color is #423FEE?

#423FEE is Vivid Blue, a blue color (RGB 66, 63, 238). Its closest standard named color is RoyalBlue.

What is the RGB and HSL of #423FEE?

#423FEE is RGB 66, 63, 238 — HSL 241°, 84%, 59% — CMYK 72%, 74%, 0%, 7%.

What colors go with #423FEE?

Its complement is #EBEE3F; analogous partners are #3F94EE and #993FEE. It also appears in 6+ palettes in our collection.

Can I use #423FEE for text?

White text on #423FEE has a contrast ratio of 6.61:1 (passes WCAG AA); black text gives 3.18:1.