Palettes / Colors / #133BB1

#133BB1 — Vivid Blue

#133BB1 is a blue color we call Vivid 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 #133BB1 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.

#133BB1 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 #AF8812; it also sits naturally between #1288AF and #3A12AF. 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 7% · Green 23% · Blue 69%

Cyan 89% · Magenta 67% · Yellow 0% · Key 31%

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

Previews

CSS code for #133BB1

.text { color: #133BB1; }
.background { background-color: #133BB1; }
.border { border: 3px solid #133BB1; }
.text-rgb { color: rgb(19, 59, 177); }
.text-hsl { color: hsl(225, 81%, 38%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #133BB1; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(19, 59, 177, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #133BB1; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(19, 59, 177, 0.8); }

HTML: <p style="color:#133BB1">Text here</p> · <div style="background-color:#133BB1">Div content here</div>

Shades of #133BB1

Tints of #133BB1

Tones of #133BB1

Color harmonies

Complementary — #AF8812:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #133BB1: #FFFFFF.

Semi-transparent (opacity) text on #133BB1

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 #133BB1 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 #133BB1 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

← #133BB0  ·  #133BB2 →

Frequently asked questions

What color is #133BB1?

#133BB1 is Vivid Blue, a blue color (RGB 19, 59, 177). Its closest standard named color is DarkSlateBlue.

What is the RGB and HSL of #133BB1?

#133BB1 is RGB 19, 59, 177 — HSL 225°, 81%, 38% — CMYK 89%, 67%, 0%, 31%.

What colors go with #133BB1?

Its complement is #AF8812; analogous partners are #1288AF and #3A12AF. It also appears in 6+ palettes in our collection.

Can I use #133BB1 for text?

White text on #133BB1 has a contrast ratio of 9.18:1 (passes WCAG AA); black text gives 2.29:1.