What color is #66DD4E?

#66DD4E is a medium green. In RGB it is rgb(102, 221, 78), and in HSL hsl(110, 68%, 59%).

Is #66DD4E accessible as text?

On white, #66DD4E has a contrast ratio of 1.75:1 (fails WCAG AA for body text); on black it is 12.02:1 (passes). For text placed on #66DD4E, use black for the best readability.

What is the closest Tailwind color to #66DD4E?

The nearest Tailwind CSS token is green-400 (#05DF72).

What colors go well with #66DD4E?

#66DD4E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C64FDE. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #66DD4E below.

Is #66DD4E good for buttons?

#66DD4E works well for buttons and highlights, but use black text on #66DD4E — white text only reaches 1.75:1, below the 4.5:1 needed for normal-size labels.

Is #66DD4E the same as CSS yellowgreen?

No — #66DD4E is not the CSS named color yellowgreen, but yellowgreen (#9ACD32) is the closest CSS named color.

#66DD4E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #66DD4E

Not just a swatch — here's how #66DD4E works with other colors. Named schemes with #66DD4E in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #66DD4E Surface #13161A Highlight #F4F6F8 Secondary #576770 Accent #9AFF85

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

Japanese Sand Base · 5 colors

Base #66DD4E Surface #EEE9DC Highlight #F5F1E7 Secondary #B7B09F Ink #2B2723

Malachite 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.

Botanical Studio Lead · 5 colors

Lead #66DD4E Secondary #4D6B3B Accent #AE6B00 Surface #EFEAD6 Anchor #3C2F21

Malachite 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 #66DD4E Secondary #D1F8CA Support #989286 Ink #17140F

Malachite 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 Malachite carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #66DD4E Accent #A8C4BA Surface #E2D9BE Secondary #9AA09F Anchor #193648

Malachite opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Build a working theme in the generator →

Color Lab

How #66DD4E 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 50/100

Neutral

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

Softness 47/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 22/100

Low

Airy and open — recedes, leaves the composition light.

Naturalness 28/100

Low

Loosely natural — an earthy edge without being rustic.

Vintage feel 17/100

Very low

Clean and current — no dusty, aged cast.

Luxury 24/100

Low

Playful and accessible rather than exclusive.

Brand distinctiveness 82/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 23/100

Low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 36/100

Low

Usable as a tinted surface in measured doses.

Print safety 53/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #66DD4E

For UI

For branding

For interior

For fashion

People also use #66DD4E with

Pear Emerald Green Medium Orchid 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 10.6:1. Use

Subtle surface Use #E3F4E0 for cards and hover fills. Tint 80

Avoid beside #4FDE67 — 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 #66DD4E 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: #66DD4E;
  --color-base-rgb: 102 221 78;
  --color-base-oklch: oklch(80.0% 0.211 140.5);
  --color-50: #F4FDF2;
  --color-100: #E1F9DC;
  --color-200: #C4F2BB;
  --color-300: #9AE38C;
  --color-400: #73D161;
  --color-500: #52B63F;
  --color-600: #458B37;
  --color-700: #35632C;
  --color-800: #264120;
  --color-900: #182815;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  malachite: {
    50: '#F4FDF2',
    100: '#E1F9DC',
    200: '#C4F2BB',
    300: '#9AE38C',
    400: '#73D161',
    500: '#52B63F',
    600: '#458B37',
    700: '#35632C',
    800: '#264120',
    900: '#182815',
  },
}

$base: #66DD4E;
$base-ink: #141310;
$base-50: #F4FDF2;
$base-100: #E1F9DC;
$base-200: #C4F2BB;
$base-300: #9AE38C;
$base-400: #73D161;
$base-500: #52B63F;
$base-600: #458B37;
$base-700: #35632C;
$base-800: #264120;
$base-900: #182815;
$base-hover: #42CA27;
$base-subtle: #D5F0CF;

{
    "color": {
        "base": {
            "value": "#66DD4E",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4FDF2",
                "type": "color"
            },
            "100": {
                "value": "#E1F9DC",
                "type": "color"
            },
            "200": {
                "value": "#C4F2BB",
                "type": "color"
            },
            "300": {
                "value": "#9AE38C",
                "type": "color"
            },
            "400": {
                "value": "#73D161",
                "type": "color"
            },
            "500": {
                "value": "#52B63F",
                "type": "color"
            },
            "600": {
                "value": "#458B37",
                "type": "color"
            },
            "700": {
                "value": "#35632C",
                "type": "color"
            },
            "800": {
                "value": "#264120",
                "type": "color"
            },
            "900": {
                "value": "#182815",
                "type": "color"
            }
        }
    }
}