What color is #66CC99?

#66CC99 is a medium teal-green. In RGB it is rgb(102, 204, 153), and in HSL hsl(150, 50%, 60%).

Is #66CC99 accessible as text?

On white, #66CC99 has a contrast ratio of 1.97:1 (fails WCAG AA for body text); on black it is 10.66:1 (passes). For text placed on #66CC99, use black for the best readability.

What is the closest Tailwind color to #66CC99?

The nearest Tailwind CSS token is emerald-400 (#00D492).

What colors go well with #66CC99?

#66CC99 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CC6699. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #66CC99 below.

Is #66CC99 good for buttons?

#66CC99 works well for buttons and highlights, but use black text on #66CC99 — white text only reaches 1.97:1, below the 4.5:1 needed for normal-size labels.

Is #66CC99 the same as CSS mediumaquamarine?

No — #66CC99 is not the CSS named color mediumaquamarine, but mediumaquamarine (#66CDAA) is the closest CSS named color.

#66CC99 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #66CC99

Not just a swatch — here's how #66CC99 works with other colors. Named schemes with #66CC99 in its natural role, and a note on why the supporting colors balance it.

Botanical Studio Lead · 5 colors

Lead #66CC99 Secondary #4A6C3D Accent #AC6D00 Surface #EEEAD6 Anchor #3C2F20

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

Coastal Morning Lead · 5 colors

Lead #66CC99 Accent #A8C4BB Surface #E1D9BE Secondary #9AA0A0 Anchor #1A3648

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

Nordic Calm Accent · 5 colors

Accent #66CC99 Secondary #ADB4B7 Surface #F1F2F0 Support #7895A3 Anchor #2D3236

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

Warm Autumn Interior Dominant · 5 colors

Dominant #66CC99 Secondary #AC6D00 Accent #667C4E Surface #F1EDDD Anchor #392B1E

This palette keeps Medium Aquamarine as the dominant warm neutral, balanced by muted terracotta and olive earth tones and grounded by a deep espresso anchor.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #66CC99 Secondary #CAEBD8 Support #989286 Ink #17140F

Medium Aquamarine 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 Medium Aquamarine carrying the quiet middle.

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Color Lab

How #66CC99 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 38/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 60/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 23/100

Low

Airy and open — recedes, leaves the composition light.

Naturalness 82/100

Very high

Organic, earthy character — at home in wellness, food and craft brands.

Vintage feel 40/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 30/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 47/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 36/100

Low

Workable accent with care around contrast.

Surface fit 41/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 75/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #66CC99

For UI

For branding

For interior

For fashion

People also use #66CC99 with

Pistachio Lagoon Blue Pale Violet Red 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 9.4:1. Use

Subtle surface Use #E3F2EB for cards and hover fills. Tint 80

Avoid beside #66CCBB — 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 #66CC99 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: #66CC99;
  --color-base-rgb: 102 204 153;
  --color-base-oklch: oklch(77.0% 0.122 159.8);
  --color-50: #F3FCF7;
  --color-100: #E0F5EB;
  --color-200: #C2EBD6;
  --color-300: #97D8B8;
  --color-400: #70C299;
  --color-500: #4EA67A;
  --color-600: #428061;
  --color-700: #335C47;
  --color-800: #243C30;
  --color-900: #18251F;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  medium-aquamarine: {
    50: '#F3FCF7',
    100: '#E0F5EB',
    200: '#C2EBD6',
    300: '#97D8B8',
    400: '#70C299',
    500: '#4EA67A',
    600: '#428061',
    700: '#335C47',
    800: '#243C30',
    900: '#18251F',
  },
}

$base: #66CC99;
$base-ink: #141310;
$base-50: #F3FCF7;
$base-100: #E0F5EB;
$base-200: #C2EBD6;
$base-300: #97D8B8;
$base-400: #70C299;
$base-500: #4EA67A;
$base-600: #428061;
$base-700: #335C47;
$base-800: #243C30;
$base-900: #18251F;
$base-hover: #3DB87A;
$base-subtle: #D5ECE0;

{
    "color": {
        "base": {
            "value": "#66CC99",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3FCF7",
                "type": "color"
            },
            "100": {
                "value": "#E0F5EB",
                "type": "color"
            },
            "200": {
                "value": "#C2EBD6",
                "type": "color"
            },
            "300": {
                "value": "#97D8B8",
                "type": "color"
            },
            "400": {
                "value": "#70C299",
                "type": "color"
            },
            "500": {
                "value": "#4EA67A",
                "type": "color"
            },
            "600": {
                "value": "#428061",
                "type": "color"
            },
            "700": {
                "value": "#335C47",
                "type": "color"
            },
            "800": {
                "value": "#243C30",
                "type": "color"
            },
            "900": {
                "value": "#18251F",
                "type": "color"
            }
        }
    }
}

Palettes built on #66CC99

Color Lab

Pairs with #66CC99

UI roles & guardrails

In real applications

Scales

Every model

Export