What color is #21BB4F?

#21BB4F is a medium, vivid green. In RGB it is rgb(33, 187, 79), and in HSL hsl(138, 70%, 43%).

Is #21BB4F accessible as text?

On white, #21BB4F has a contrast ratio of 2.53:1 (fails WCAG AA for body text); on black it is 8.29:1 (passes). For text placed on #21BB4F, use black for the best readability.

What is the closest Tailwind color to #21BB4F?

The nearest Tailwind CSS token is green-500 (#00C950).

What colors go well with #21BB4F?

#21BB4F pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BA218C. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #21BB4F below.

Is #21BB4F good for buttons?

#21BB4F works well for buttons and highlights, but use black text on #21BB4F — white text only reaches 2.53:1, below the 4.5:1 needed for normal-size labels.

Is #21BB4F the same as CSS mediumseagreen?

No — #21BB4F is not the CSS named color mediumseagreen, but mediumseagreen (#3CB371) is the closest CSS named color.

#21BB4F Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #21BB4F

Not just a swatch — here's how #21BB4F works with other colors. Named schemes with #21BB4F in its natural role, and a note on why the supporting colors balance it.

Nordic Calm Accent · 5 colors

Accent #21BB4F Secondary #ADB4B7 Surface #F1F2F0 Support #7895A3 Anchor #2D3236

Kelly Green keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #21BB4F Surface #13161A Highlight #F4F6F8 Secondary #576770 Accent #68E07E

Kelly Green is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Kelly Green.

Botanical Studio Lead · 5 colors

Lead #21BB4F Secondary #4C6B3C Accent #AD6C00 Surface #EEEAD6 Anchor #3C2F20

Kelly Green leads this botanical set among foliage greens and a terracotta accent, softened by cream and grounded in bark brown.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #21BB4F Secondary #ACD5B0 Support #989286 Ink #17140F

Kelly Green is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Kelly Green carrying the quiet middle.

Japanese Sand Base · 5 colors

Base #21BB4F Surface #EEE9DC Highlight #F5F1E7 Secondary #B6B09F Ink #2B2723

Kelly Green sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Build a working theme in the generator →

Color Lab

How #21BB4F actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 43/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 44/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 33/100

Low

Mid depth — usable as an accent or a muted ground.

Naturalness 42/100

Moderate

Loosely natural — an earthy edge without being rustic.

Vintage feel 27/100

Low

A faint retro warmth without tipping into sepia.

Luxury 35/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 74/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 56/100

Moderate

Workable accent with care around contrast.

Surface fit 26/100

Low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 58/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #21BB4F

For UI

For branding

For interior

For fashion

People also use #21BB4F with

Malachite Tiffany Blue Fandango Platinum Hunter Green

UI roles & guardrails

Primary action Safe as a filled button with near-black label. AAA

Body text Do not use for body copy on light surfaces. Avoid

Large display Only on dark surfaces. Avoid

Background Pair with #141310 text at 7.3:1. Use

Subtle surface Use #D3F1DC for cards and hover fills. Tint 80

Avoid beside #21BA82 — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #21BB4F at work across the surfaces designers actually ship.

Website / UI

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Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #21BB4F;
  --color-base-rgb: 33 187 79;
  --color-base-oklch: oklch(69.4% 0.193 147.7);
  --color-50: #F1FDF5;
  --color-100: #DBFAE5;
  --color-200: #BAF3CB;
  --color-300: #8AE5A6;
  --color-400: #5FD382;
  --color-500: #3DB862;
  --color-600: #358C4F;
  --color-700: #2B643C;
  --color-800: #20412A;
  --color-900: #15281B;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  kelly-green: {
    50: '#F1FDF5',
    100: '#DBFAE5',
    200: '#BAF3CB',
    300: '#8AE5A6',
    400: '#5FD382',
    500: '#3DB862',
    600: '#358C4F',
    700: '#2B643C',
    800: '#20412A',
    900: '#15281B',
  },
}

$base: #21BB4F;
$base-ink: #141310;
$base-50: #F1FDF5;
$base-100: #DBFAE5;
$base-200: #BAF3CB;
$base-300: #8AE5A6;
$base-400: #5FD382;
$base-500: #3DB862;
$base-600: #358C4F;
$base-700: #2B643C;
$base-800: #20412A;
$base-900: #15281B;
$base-hover: #1A953F;
$base-subtle: #BCEBCA;

{
    "color": {
        "base": {
            "value": "#21BB4F",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FDF5",
                "type": "color"
            },
            "100": {
                "value": "#DBFAE5",
                "type": "color"
            },
            "200": {
                "value": "#BAF3CB",
                "type": "color"
            },
            "300": {
                "value": "#8AE5A6",
                "type": "color"
            },
            "400": {
                "value": "#5FD382",
                "type": "color"
            },
            "500": {
                "value": "#3DB862",
                "type": "color"
            },
            "600": {
                "value": "#358C4F",
                "type": "color"
            },
            "700": {
                "value": "#2B643C",
                "type": "color"
            },
            "800": {
                "value": "#20412A",
                "type": "color"
            },
            "900": {
                "value": "#15281B",
                "type": "color"
            }
        }
    }
}

Palettes built on #21BB4F

Color Lab

Pairs with #21BB4F

UI roles & guardrails

In real applications

Scales

Every model

Export