#128a5b

Color #128a5b

A vivid, highly saturated dark green.

Closest named color Sea Green #2e8b57 · ΔE 4.41 Nearest Tailwind class emerald-600 #009966 · ΔE 5.1

Open in Palette generator Color wheel Color mixer Contrast checker Blindness simulator Gradient

Conversions

HEX

#128a5b

RGB

rgb(18, 138, 91)

HSL

hsl(156.5, 76.9%, 30.6%)

HSV / HSB

hsv(156.5, 87%, 54.1%)

CMYK

cmyk(87%, 0%, 34.1%, 45.9%)

LAB

lab(50.76, -42.43, 16.66)

LCH

lch(50.76, 45.58, 158.56)

OKLCH

oklch(56.1%, 0.1225, 159.89)

HWB

hwb(156.5, 7.1%, 45.9%)

Harmony colors

Complementary

#8a1241

Analogous

#128a1f

#128a5b

#127d8a

Triadic

#128a5b

#5b128a

#8a5b12

Split-complementary

#128a5b

#8a127d

#8a1f12

Tetradic

#128a5b

#12418a

#8a1241

#8a5b12

Square

#128a5b

#1f128a

#8a1241

#7d8a12

Shades

Color #128a5b mixed toward black.

#0f734c

#0c5c3d

#09452e

#062e1e

#03170f

Tints

Color #128a5b mixed toward white.

#19be7d

#2ee49d

#62ebb5

#97f1ce

#cbf8e6

Tones

Color #128a5b mixed toward gray.

#1c8059

#267657

#306c55

#3a6252

#445850

Accessibility

Aa White text on this color

4.36:1

Aa Black text on this color

4.81:1

Black text reads better on this background (4.81:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#5f6069 · ΔE 29

Deuteranopia

#59506c · ΔE 36.9

Tritanopia

#257274 · ΔE 18.8

Achromatopsia

#797979 · ΔE 24.3

Left half is the original, right half is the simulated appearance. See all 8 vision types →

Code

CSS

background-color: #128a5b;

Tailwind (arbitrary value)

bg-[#128a5b]

Related colors

Medium Spring Green #00fa9a

Medium Aquamarine #66cdaa

Aquamarine #7fffd4

Mint Cream #f5fffa

Spring Green #00ff7f

Medium Sea Green #3cb371

Frequently asked questions

#128a5b (#128a5b) is rgb(18, 138, 91) in RGB.

No, #128a5b is not one of the 216 web-safe colors — for that, every RGB channel would have to be a multiple of 51.

Related tools

Colors

HEX to RGB Converter

Convert any HEX color code to its RGB and HSL equivalents, live, with copy-to-clipboard values.

Try it → Accessibility

Contrast Checker

Check the WCAG contrast ratio between any two colors, live, with AA/AAA pass-fail results.

Try it → Generators

Palette Generator

Generate complementary, analogous, triadic, split-complementary, tetradic, square, and monochromatic palettes from any base color.

Try it →

Build something with this color

Generate a full palette from #128a5b, or check how it holds up for accessibility.

Generate a palette → Check contrast