#21efff

Color #21efff

A vivid, highly saturated medium cyan.

Closest named color Aqua #00ffff · ΔE 11.41 Nearest Tailwind class cyan-300 #53eafd · ΔE 2.7

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Conversions

HEX

#21efff

RGB

rgb(33, 239, 255)

HSL

hsl(184.3, 100%, 56.5%)

HSV / HSB

hsv(184.3, 87.1%, 100%)

CMYK

cmyk(87.1%, 6.3%, 0%, 0%)

LAB

lab(86.64, -40.03, -20.85)

LCH

lch(86.64, 45.13, 207.51)

OKLCH

oklch(87%, 0.1445, 203.71)

HWB

hwb(184.3, 12.9%, 0%)

Harmony colors

Complementary

#ff3121

Analogous

#21ffa0

#21efff

#2180ff

Triadic

#21efff

#ff21ef

#efff21

Split-complementary

#21efff

#ff2180

#ffa021

Tetradic

#21efff

#3121ff

#ff3121

#efff21

Square

#21efff

#a021ff

#ff3121

#80ff21

Shades

Color #21efff mixed toward black.

#00dff0

#00b2c0

#008690

#005960

#002d30

Tints

Color #21efff mixed toward white.

#46f2ff

#6bf4ff

#90f7ff

#b5faff

#dafcff

Tones

Color #21efff mixed toward gray.

#34dfed

#46cfda

#59c0c8

#6bb0b5

#7ea0a3

Accessibility

Aa White text on this color

1.41:1

Aa Black text on this color

14.86:1

Black text reads better on this background (14.86:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#a6a8fb · ΔE 34

Deuteranopia

#9c8efa · ΔE 39.2

Tritanopia

#44f8f8 · ΔE 5.3

Achromatopsia

#d9d9d9 · ΔE 24.1

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

Code

CSS

background-color: #21efff;

Tailwind (arbitrary value)

bg-[#21efff]

Related colors

Powder Blue #b0e0e6

Cadet Blue #5f9ea0

Dark Turquoise #00ced1

Aqua #00ffff

Azure #f0ffff

Dark Cyan #008b8b

Frequently asked questions

#21efff (#21efff) is rgb(33, 239, 255) in RGB.

No, #21efff 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.

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Contrast Checker

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

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Palette Generator

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

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Build something with this color

Generate a full palette from #21efff, or check how it holds up for accessibility.

Generate a palette → Check contrast