Palettes / Colors / #5B51EC

#5B51EC — Vivid Blue

#5B51EC is a blue color we call Vivid Blue, closest to the named color SlateBlue (#6A5ACD). It belongs to the blue family.

Color name

Closest CSS keyword: slateblue (#6A5ACD) — not an exact match. CSS slateblue gives you #6A5ACD, a different color; use #5B51EC 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.

#5B51EC 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 #E1EC51; it also sits naturally between #5194EC and #A851EC. 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 36% · Green 32% · Blue 93%

Cyan 61% · Magenta 66% · Yellow 0% · Key 7%

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

Previews

CSS code for #5B51EC

.text { color: #5B51EC; }
.background { background-color: #5B51EC; }
.border { border: 3px solid #5B51EC; }
.text-rgb { color: rgb(91, 81, 236); }
.text-hsl { color: hsl(244, 80%, 62%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #5B51EC; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(91, 81, 236, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #5B51EC; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(91, 81, 236, 0.8); }

HTML: <p style="color:#5B51EC">Text here</p> · <div style="background-color:#5B51EC">Div content here</div>

Shades of #5B51EC

Tints of #5B51EC

Tones of #5B51EC

Color harmonies

Complementary — #E1EC51:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #5B51EC: #FFFFFF.

Semi-transparent (opacity) text on #5B51EC

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 #5B51EC 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 #5B51EC 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

← #5B51EB  ·  #5B51ED →

Frequently asked questions

What color is #5B51EC?

#5B51EC is Vivid Blue, a blue color (RGB 91, 81, 236). Its closest standard named color is SlateBlue.

What is the RGB and HSL of #5B51EC?

#5B51EC is RGB 91, 81, 236 — HSL 244°, 80%, 62% — CMYK 61%, 66%, 0%, 7%.

What colors go with #5B51EC?

Its complement is #E1EC51; analogous partners are #5194EC and #A851EC. It also appears in 6+ palettes in our collection.

Can I use #5B51EC for text?

White text on #5B51EC has a contrast ratio of 5.48:1 (passes WCAG AA); black text gives 3.83:1.