Palettes / Colors / #243DB8

#243DB8 — Blue

#243DB8 is a blue color we call Blue, closest to the named color DarkSlateBlue (#483D8B). It belongs to the blue family.

Color name

Closest CSS keyword: darkslateblue (#483D8B) — not an exact match. CSS darkslateblue gives you #483D8B, a different color; use #243DB8 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.

#243DB8 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 #B79F24; it also sits naturally between #2486B7 and #5524B7. 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 14% · Green 24% · Blue 72%

Cyan 80% · Magenta 67% · Yellow 0% · Key 28%

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

Previews

CSS code for #243DB8

.text { color: #243DB8; }
.background { background-color: #243DB8; }
.border { border: 3px solid #243DB8; }
.text-rgb { color: rgb(36, 61, 184); }
.text-hsl { color: hsl(230, 67%, 43%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #243DB8; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(36, 61, 184, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #243DB8; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(36, 61, 184, 0.8); }

HTML: <p style="color:#243DB8">Text here</p> · <div style="background-color:#243DB8">Div content here</div>

Shades of #243DB8

Tints of #243DB8

Tones of #243DB8

Color harmonies

Complementary — #B79F24:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #243DB8: #FFFFFF.

Semi-transparent (opacity) text on #243DB8

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 #243DB8 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 #243DB8 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

← #243DB7  ·  #243DB9 →

Frequently asked questions

What color is #243DB8?

#243DB8 is Blue, a blue color (RGB 36, 61, 184). Its closest standard named color is DarkSlateBlue.

What is the RGB and HSL of #243DB8?

#243DB8 is RGB 36, 61, 184 — HSL 230°, 67%, 43% — CMYK 80%, 67%, 0%, 28%.

What colors go with #243DB8?

Its complement is #B79F24; analogous partners are #2486B7 and #5524B7. It also appears in 6+ palettes in our collection.

Can I use #243DB8 for text?

White text on #243DB8 has a contrast ratio of 8.63:1 (passes WCAG AA); black text gives 2.43:1.