What color is #40DD99?

#40DD99 is a medium, vivid teal-green. In RGB it is rgb(64, 221, 153), and in HSL hsl(154, 70%, 56%).

Is #40DD99 accessible as text?

On white, #40DD99 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 #40DD99, use black for the best readability.

What is the closest Tailwind color to #40DD99?

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

What colors go well with #40DD99?

#40DD99 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #DD4084. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #40DD99 below.

Is #40DD99 good for buttons?

#40DD99 works well for buttons and highlights, but use black text on #40DD99 — white text only reaches 1.75:1, below the 4.5:1 needed for normal-size labels.

Is #40DD99 the same as CSS mediumaquamarine?

No — #40DD99 is not the CSS named color mediumaquamarine, but mediumaquamarine (#66CDAA) is the closest CSS named color.

#40DD99 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #40DD99

Not just a swatch — here's how #40DD99 works with other colors. Named schemes with #40DD99 in its natural role, and a note on why the supporting colors balance it.

Botanical Studio Lead · 5 colors

Lead #40DD99 Secondary #4A6C3D Accent #AC6D00 Surface #EEEAD6 Anchor #3C2F20

Emerald Green 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 #40DD99 Accent #A8C4BB Surface #E1D9BE Secondary #9AA0A0 Anchor #1A3648

Emerald Green 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 #40DD99 Secondary #ADB4B7 Surface #F1F2F0 Support #7895A3 Anchor #2D3236

Emerald Green 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 #40DD99 Secondary #AC6D00 Accent #667C4E Surface #F1EDDD Anchor #392B1E

This palette keeps Emerald Green 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 #40DD99 Secondary #CCF8DE Support #989286 Ink #17140F

Emerald 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 Emerald Green carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #40DD99 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 34/100

Cool

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

Softness 55/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 21/100

Low

Airy and open — recedes, leaves the composition light.

Naturalness 57/100

Moderate

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

Vintage feel 28/100

Low

A faint retro warmth without tipping into sepia.

Luxury 26/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 63/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 28/100

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 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #40DD99

For UI

For branding

For interior

For fashion

People also use #40DD99 with

Malachite Lagoon Blue Razzmatazz Platinum Dark Slate Gray

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 #DDF4EA for cards and hover fills. Tint 80

Avoid beside #40DDCE — 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 #40DD99 at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #40DD99;
  --color-base-rgb: 64 221 153;
  --color-base-oklch: oklch(80.0% 0.162 159.9);
  --color-50: #F1FDF8;
  --color-100: #DBFAED;
  --color-200: #BAF3DA;
  --color-300: #8AE5BE;
  --color-400: #5FD3A1;
  --color-500: #3DB883;
  --color-600: #358C67;
  --color-700: #2B644B;
  --color-800: #204133;
  --color-900: #152820;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  emerald-green: {
    50: '#F1FDF8',
    100: '#DBFAED',
    200: '#BAF3DA',
    300: '#8AE5BE',
    400: '#5FD3A1',
    500: '#3DB883',
    600: '#358C67',
    700: '#2B644B',
    800: '#204133',
    900: '#152820',
  },
}

$base: #40DD99;
$base-ink: #141310;
$base-50: #F1FDF8;
$base-100: #DBFAED;
$base-200: #BAF3DA;
$base-300: #8AE5BE;
$base-400: #5FD3A1;
$base-500: #3DB883;
$base-600: #358C67;
$base-700: #2B644B;
$base-800: #204133;
$base-900: #152820;
$base-hover: #22C27D;
$base-subtle: #CBEFE0;

{
    "color": {
        "base": {
            "value": "#40DD99",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FDF8",
                "type": "color"
            },
            "100": {
                "value": "#DBFAED",
                "type": "color"
            },
            "200": {
                "value": "#BAF3DA",
                "type": "color"
            },
            "300": {
                "value": "#8AE5BE",
                "type": "color"
            },
            "400": {
                "value": "#5FD3A1",
                "type": "color"
            },
            "500": {
                "value": "#3DB883",
                "type": "color"
            },
            "600": {
                "value": "#358C67",
                "type": "color"
            },
            "700": {
                "value": "#2B644B",
                "type": "color"
            },
            "800": {
                "value": "#204133",
                "type": "color"
            },
            "900": {
                "value": "#152820",
                "type": "color"
            }
        }
    }
}