Palettes / Colors / #331FBB

#331FBB — Blue

#331FBB 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 #331FBB 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.

#331FBB 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 #A8BD1F; it also sits naturally between #1F59BD and #831FBD. 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 20% · Green 12% · Blue 73%

Cyan 73% · Magenta 83% · Yellow 0% · Key 27%

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

Previews

CSS code for #331FBB

.text { color: #331FBB; }
.background { background-color: #331FBB; }
.border { border: 3px solid #331FBB; }
.text-rgb { color: rgb(51, 31, 187); }
.text-hsl { color: hsl(248, 72%, 43%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #331FBB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(51, 31, 187, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #331FBB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(51, 31, 187, 0.8); }

HTML: <p style="color:#331FBB">Text here</p> · <div style="background-color:#331FBB">Div content here</div>

Shades of #331FBB

Tints of #331FBB

Tones of #331FBB

Color harmonies

Complementary — #A8BD1F:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #331FBB: #FFFFFF.

Semi-transparent (opacity) text on #331FBB

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 #331FBB 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 #331FBB 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

← #331FBA  ·  #331FBC →

Frequently asked questions

What color is #331FBB?

#331FBB is Blue, a blue color (RGB 51, 31, 187). Its closest standard named color is DarkSlateBlue.

What is the RGB and HSL of #331FBB?

#331FBB is RGB 51, 31, 187 — HSL 248°, 72%, 43% — CMYK 73%, 83%, 0%, 27%.

What colors go with #331FBB?

Its complement is #A8BD1F; analogous partners are #1F59BD and #831FBD. It also appears in 6+ palettes in our collection.

Can I use #331FBB for text?

White text on #331FBB has a contrast ratio of 10.22:1 (passes WCAG AA); black text gives 2.05:1.