Palettes / Colors / #243FDB

#243FDB — Blue

#243FDB 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 #243FDB 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.

#243FDB 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 #DBC024; it also sits naturally between #249BDB and #6424DB. 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 25% · Blue 86%

Cyan 84% · Magenta 71% · Yellow 0% · Key 14%

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

Previews

CSS code for #243FDB

.text { color: #243FDB; }
.background { background-color: #243FDB; }
.border { border: 3px solid #243FDB; }
.text-rgb { color: rgb(36, 63, 219); }
.text-hsl { color: hsl(231, 72%, 50%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #243FDB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(36, 63, 219, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #243FDB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(36, 63, 219, 0.8); }

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

Shades of #243FDB

Tints of #243FDB

Tones of #243FDB

Color harmonies

Complementary — #DBC024:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #243FDB: #FFFFFF.

Semi-transparent (opacity) text on #243FDB

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 #243FDB 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 #243FDB 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

← #243FDA  ·  #243FDC →

Frequently asked questions

What color is #243FDB?

#243FDB is Blue, a blue color (RGB 36, 63, 219). Its closest standard named color is RoyalBlue.

What is the RGB and HSL of #243FDB?

#243FDB is RGB 36, 63, 219 — HSL 231°, 72%, 50% — CMYK 84%, 71%, 0%, 14%.

What colors go with #243FDB?

Its complement is #DBC024; analogous partners are #249BDB and #6424DB. It also appears in 6+ palettes in our collection.

Can I use #243FDB for text?

White text on #243FDB has a contrast ratio of 7.48:1 (passes WCAG AA); black text gives 2.81:1.