What color is #637F81?

#637F81 is a grayish cyan, closest to the named color North Atlantic. It belongs to the gray family of colors.

What is the RGB value of #637F81?

The RGB value is 99, 127, 129: 99 red, 127 green and 129 blue on a 0 to 255 scale.

What is the complementary color of #637F81?

The complementary color is #816563, found by rotating the hue 180° on the color wheel.

Is black or white text better on #637F81?

Black text. Black text has a contrast ratio of 4.88:1 and white text 4.3:1. WCAG asks for at least 4.5:1 for normal text.

#637F81 color

#637F81 rgb(99, 127, 129)

Shades of gray

The hex color #637F81 is a grayish cyan.

In the RGB color model it is made of 38.8% red, 49.8% green and 50.6% blue (99, 127, 129).

Its hue angle is 184°, with 13% saturation and 45% lightness. For print, the CMYK equivalent is 23% cyan, 2% magenta, 0% yellow and 49% black.

The closest named color is North Atlantic (#5E7B7F), a difference of 1.9 ΔE, which is barely visible.

Black text is the more readable choice on this background (contrast 4.88:1).

#637F81 color codes

HEX	`#637F81`
RGB	`rgb(99, 127, 129)`
RGB percent	`rgb(38.8%, 49.8%, 50.6%)`
HSL	`hsl(184, 13%, 45%)`
HSV / HSB	`hsv(184, 23%, 51%)`
CMYK	`cmyk(23%, 2%, 0%, 49%)`
CIE LAB	`lab(51.17, -9.5, -4.38)`
CIE LCH	`lch(51.17, 10.46, 204.76)`
CIE XYZ	`xyz(16.696, 19.416, 23.633)`
Decimal	`6520705`
Short hex	`None (no 3-digit form)`

Color harmonies

Colors that go with #637F81, based on their position on the color wheel.

Complementary

The color opposite on the color wheel (180°). Strongest contrast.

Analogous

Neighbors 30° either side. Calm, natural combinations.

Split complementary

The two colors next to the complement (150° and 210°).

Triadic

Three colors evenly spaced, 120° apart.

Tetradic (square)

Four colors 90° apart.

Shades, tints and tones

Shades (darker, mixed with black)

Tints (lighter, mixed with white)

Tones (mixed with gray)

Contrast and accessibility

Text on #637F81	Ratio	AA	AAA	AA large
Sample text	4.88:1	Pass	Fail	Pass
Sample text	4.3:1	Fail	Fail	Pass

#637F81 as text on	Ratio	AA	AAA	AA large
Sample text	4.3:1	Fail	Fail	Pass
Sample text	4.88:1	Pass	Fail	Pass

WCAG 2 asks for 4.5:1 for normal text (AA), 7:1 for AAA, and 3:1 for large text. Check other pairs.

Color blindness simulation

How #637F81 looks to people with the most common types of color vision deficiency.

CSS examples

.background { background-color: #637f81; }
.text { color: #637f81; }
.border { border: 2px solid #637f81; }
.transparent { background-color: rgb(99 127 129 / 50%); }
.gradient { background: linear-gradient(to right, #637f81, #637081); }

Background

Text color

Border

Similar colors

Closest common color name: Juniper.

Questions

What color is #637F81?: #637F81 is a grayish cyan, closest to the named color North Atlantic. It belongs to the gray family of colors.
What is the RGB value of #637F81?: The RGB value is 99, 127, 129: 99 red, 127 green and 129 blue on a 0 to 255 scale.
What is the complementary color of #637F81?: The complementary color is #816563, found by rotating the hue 180° on the color wheel.
Is black or white text better on #637F81?: Black text. Black text has a contrast ratio of 4.88:1 and white text 4.3:1. WCAG asks for at least 4.5:1 for normal text.