Palettes / Colors / #331F8B

#331F8B — Blue

#331F8B 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 #331F8B 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.

#331F8B 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 #768A1E; it also sits naturally between #1E408A and #681E8A. 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 55%

Cyan 63% · Magenta 78% · Yellow 0% · Key 45%

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

Previews

CSS code for #331F8B

.text { color: #331F8B; }
.background { background-color: #331F8B; }
.border { border: 3px solid #331F8B; }
.text-rgb { color: rgb(51, 31, 139); }
.text-hsl { color: hsl(251, 64%, 33%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #331F8B; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(51, 31, 139, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #331F8B; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(51, 31, 139, 0.8); }

HTML: <p style="color:#331F8B">Text here</p> · <div style="background-color:#331F8B">Div content here</div>

Shades of #331F8B

Tints of #331F8B

Tones of #331F8B

Color harmonies

Complementary — #768A1E:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #331F8B: #FFFFFF.

Semi-transparent (opacity) text on #331F8B

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 #331F8B 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 #331F8B 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

← #331F8A  ·  #331F8C →

Frequently asked questions

What color is #331F8B?

#331F8B is Blue, a blue color (RGB 51, 31, 139). Its closest standard named color is DarkSlateBlue.

What is the RGB and HSL of #331F8B?

#331F8B is RGB 51, 31, 139 — HSL 251°, 64%, 33% — CMYK 63%, 78%, 0%, 45%.

What colors go with #331F8B?

Its complement is #768A1E; analogous partners are #1E408A and #681E8A. It also appears in 6+ palettes in our collection.

Can I use #331F8B for text?

White text on #331F8B has a contrast ratio of 12.28:1 (passes WCAG AA); black text gives 1.71:1.