Palettes / Colors / #231BBB

#231BBB — Blue

#231BBB is a blue color we call Blue, closest to the named color DarkBlue (#00008B). It belongs to the blue family.

Color name

Closest CSS keyword: darkblue (#00008B) — not an exact match. CSS darkblue gives you #00008B, a different color; use #231BBB 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.

#231BBB 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 #B3BB1B; it also sits naturally between #1B63BB and #731BBB. 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 11% · Blue 73%

Cyan 81% · Magenta 86% · Yellow 0% · Key 27%

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

Previews

CSS code for #231BBB

.text { color: #231BBB; }
.background { background-color: #231BBB; }
.border { border: 3px solid #231BBB; }
.text-rgb { color: rgb(35, 27, 187); }
.text-hsl { color: hsl(243, 75%, 42%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #231BBB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(35, 27, 187, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #231BBB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(35, 27, 187, 0.8); }

HTML: <p style="color:#231BBB">Text here</p> · <div style="background-color:#231BBB">Div content here</div>

Shades of #231BBB

Tints of #231BBB

Tones of #231BBB

Color harmonies

Complementary — #B3BB1B:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #231BBB: #FFFFFF.

Semi-transparent (opacity) text on #231BBB

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 #231BBB 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 #231BBB 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

← #231BBA  ·  #231BBC →

Frequently asked questions

What color is #231BBB?

#231BBB is Blue, a blue color (RGB 35, 27, 187). Its closest standard named color is DarkBlue.

What is the RGB and HSL of #231BBB?

#231BBB is RGB 35, 27, 187 — HSL 243°, 75%, 42% — CMYK 81%, 86%, 0%, 27%.

What colors go with #231BBB?

Its complement is #B3BB1B; analogous partners are #1B63BB and #731BBB. It also appears in 6+ palettes in our collection.

Can I use #231BBB for text?

White text on #231BBB has a contrast ratio of 10.79:1 (passes WCAG AA); black text gives 1.95:1.