What color is #637F7B?

#637F7B is a grayish spring green, closest to the named color Underwater World. It belongs to the gray family of colors.

What is the RGB value of #637F7B?

The RGB value is 99, 127, 123: 99 red, 127 green and 123 blue on a 0 to 255 scale.

What is the complementary color of #637F7B?

The complementary color is #7F6367, found by rotating the hue 180° on the color wheel.

Is black or white text better on #637F7B?

Black text. Black text has a contrast ratio of 4.85:1 and white text 4.33:1. WCAG asks for at least 4.5:1 for normal text.

#637F7B color

#637F7B rgb(99, 127, 123)

Shades of gray

The hex color #637F7B is a grayish spring green.

In the RGB color model it is made of 38.8% red, 49.8% green and 48.2% blue (99, 127, 123).

Its hue angle is 171°, with 12% saturation and 44% lightness. For print, the CMYK equivalent is 22% cyan, 0% magenta, 3% yellow and 50% black.

The closest named color is Underwater World (#657F7A), a difference of 0.7 ΔE, which is barely visible.

Black text is the more readable choice on this background (contrast 4.85:1).

#637F7B color codes

HEX	`#637F7B`
RGB	`rgb(99, 127, 123)`
RGB percent	`rgb(38.8%, 49.8%, 48.2%)`
HSL	`hsl(171, 12%, 44%)`
HSV / HSB	`hsv(171, 22%, 50%)`
CMYK	`cmyk(22%, 0%, 3%, 50%)`
CIE LAB	`lab(50.99, -10.91, -1.13)`
CIE LCH	`lch(50.99, 10.97, 185.91)`
CIE XYZ	`xyz(16.309, 19.261, 21.593)`
Decimal	`6520699`
Short hex	`None (no 3-digit form)`

Color harmonies

Colors that go with #637F7B, 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 #637F7B	Ratio	AA	AAA	AA large
Sample text	4.85:1	Pass	Fail	Pass
Sample text	4.33:1	Fail	Fail	Pass

#637F7B as text on	Ratio	AA	AAA	AA large
Sample text	4.33:1	Fail	Fail	Pass
Sample text	4.85:1	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 #637F7B looks to people with the most common types of color vision deficiency.

CSS examples

.background { background-color: #637f7b; }
.text { color: #637f7b; }
.border { border: 2px solid #637f7b; }
.transparent { background-color: rgb(99 127 123 / 50%); }
.gradient { background: linear-gradient(to right, #637f7b, #63757f); }

Background

Text color

Border

Similar colors

Closest common color name: Smoke.

Questions

What color is #637F7B?: #637F7B is a grayish spring green, closest to the named color Underwater World. It belongs to the gray family of colors.
What is the RGB value of #637F7B?: The RGB value is 99, 127, 123: 99 red, 127 green and 123 blue on a 0 to 255 scale.
What is the complementary color of #637F7B?: The complementary color is #7F6367, found by rotating the hue 180° on the color wheel.
Is black or white text better on #637F7B?: Black text. Black text has a contrast ratio of 4.85:1 and white text 4.33:1. WCAG asks for at least 4.5:1 for normal text.