Palettes / Colors / #637DFD

#637DFD — Light Vivid Blue

#637DFD is a blue color we call Light Vivid Blue, closest to the named color CornflowerBlue (#6495ED). It belongs to the blue family.

Color name

Closest CSS keyword: cornflowerblue (#6495ED) — not an exact match. CSS cornflowerblue gives you #6495ED, a different color; use #637DFD 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.

#637DFD 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 #FDE363; it also sits naturally between #63CAFD and #9663FD. 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 39% · Green 49% · Blue 99%

Cyan 61% · Magenta 51% · Yellow 0% · Key 1%

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

Previews

CSS code for #637DFD

.text { color: #637DFD; }
.background { background-color: #637DFD; }
.border { border: 3px solid #637DFD; }
.text-rgb { color: rgb(99, 125, 253); }
.text-hsl { color: hsl(230, 97%, 69%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #637DFD; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(99, 125, 253, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #637DFD; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(99, 125, 253, 0.8); }

HTML: <p style="color:#637DFD">Text here</p> · <div style="background-color:#637DFD">Div content here</div>

Shades of #637DFD

Tints of #637DFD

Tones of #637DFD

Color harmonies

Complementary — #FDE363:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #637DFD: #000000.

Semi-transparent (opacity) text on #637DFD

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 #637DFD 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 #637DFD 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

← #637DFC  ·  #637DFE →

Frequently asked questions

What color is #637DFD?

#637DFD is Light Vivid Blue, a blue color (RGB 99, 125, 253). Its closest standard named color is CornflowerBlue.

What is the RGB and HSL of #637DFD?

#637DFD is RGB 99, 125, 253 — HSL 230°, 97%, 69% — CMYK 61%, 51%, 0%, 1%.

What colors go with #637DFD?

Its complement is #FDE363; analogous partners are #63CAFD and #9663FD. It also appears in 6+ palettes in our collection.

Can I use #637DFD for text?

Black text on #637DFD has a contrast ratio of 5.88:1 (passes WCAG AA); white text gives 3.57:1.