What color is #40F321?

#40F321 is a medium, vivid green. In RGB it is rgb(64, 243, 33), and in HSL hsl(111, 90%, 54%).

Is #40F321 accessible as text?

On white, #40F321 has a contrast ratio of 1.49:1 (fails WCAG AA for body text); on black it is 14.06:1 (passes). For text placed on #40F321, use black for the best readability.

What is the closest Tailwind color to #40F321?

The nearest Tailwind CSS token is lime-400 (#9AE600).

What colors go well with #40F321?

#40F321 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #D420F3. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #40F321 below.

Is #40F321 good for buttons?

#40F321 works well for buttons and highlights, but use black text on #40F321 — white text only reaches 1.49:1, below the 4.5:1 needed for normal-size labels.

Is #40F321 the same as CSS lime?

No — #40F321 is not the CSS named color lime, but lime (#00FF00) is the closest CSS named color.

#40F321 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #40F321

Not just a swatch — here's how #40F321 works with other colors. Named schemes with #40F321 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #40F321 Surface #13161A Highlight #F4F6F8 Secondary #576770 Accent #86FF73

Neon 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 Neon Green.

Japanese Sand Base · 5 colors

Base #40F321 Surface #EEE9DC Highlight #F5F1E7 Secondary #B7B09F Ink #2B2723

Neon 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.

Botanical Studio Lead · 5 colors

Lead #40F321 Secondary #4D6B3B Accent #AE6B00 Surface #EEEAD6 Anchor #3C2F21

Neon 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 #40F321 Secondary #D6FFCE Support #989286 Ink #17140F

Neon 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 Neon Green carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #40F321 Accent #A8C4BA Surface #E2D9BE Secondary #9AA09F Anchor #193648

Neon Green 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 #40F321 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 49/100

Neutral

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

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 18/100

Very low

Airy and open — recedes, leaves the composition light.

Naturalness 3/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 1/100

Very low

Clean and current — no dusty, aged cast.

Luxury 18/100

Very low

Playful and accessible rather than exclusive.

Brand distinctiveness 100/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 9/100

Very low

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

Surface fit 40/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 40/100

Moderate

Shifts noticeably in CMYK — expect it to dull on press.

Pairs with #40F321

For UI

For branding

For interior

For fashion

People also use #40F321 with

Electric Lime Spring 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 12.4:1. Use

Subtle surface Use #DDF7D8 for cards and hover fills. Tint 80

Avoid beside #20F347 — 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 #40F321 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: #40F321;
  --color-base-rgb: 64 243 33;
  --color-base-oklch: oklch(84.2% 0.270 141.4);
  --color-50: #F2FEF0;
  --color-100: #DDFDD8;
  --color-200: #BDFBB2;
  --color-300: #8FF27E;
  --color-400: #65E34F;
  --color-500: #43CA2B;
  --color-600: #3A9929;
  --color-700: #2E6C23;
  --color-800: #21461B;
  --color-900: #162B12;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  neon-green: {
    50: '#F2FEF0',
    100: '#DDFDD8',
    200: '#BDFBB2',
    300: '#8FF27E',
    400: '#65E34F',
    500: '#43CA2B',
    600: '#3A9929',
    700: '#2E6C23',
    800: '#21461B',
    900: '#162B12',
  },
}

$base: #40F321;
$base-ink: #141310;
$base-50: #F2FEF0;
$base-100: #DDFDD8;
$base-200: #BDFBB2;
$base-300: #8FF27E;
$base-400: #65E34F;
$base-500: #43CA2B;
$base-600: #3A9929;
$base-700: #2E6C23;
$base-800: #21461B;
$base-900: #162B12;
$base-hover: #29D10B;
$base-subtle: #CBF4C4;

{
    "color": {
        "base": {
            "value": "#40F321",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2FEF0",
                "type": "color"
            },
            "100": {
                "value": "#DDFDD8",
                "type": "color"
            },
            "200": {
                "value": "#BDFBB2",
                "type": "color"
            },
            "300": {
                "value": "#8FF27E",
                "type": "color"
            },
            "400": {
                "value": "#65E34F",
                "type": "color"
            },
            "500": {
                "value": "#43CA2B",
                "type": "color"
            },
            "600": {
                "value": "#3A9929",
                "type": "color"
            },
            "700": {
                "value": "#2E6C23",
                "type": "color"
            },
            "800": {
                "value": "#21461B",
                "type": "color"
            },
            "900": {
                "value": "#162B12",
                "type": "color"
            }
        }
    }
}

Palettes built on #40F321

Color Lab

Pairs with #40F321

UI roles & guardrails

In real applications

Scales

Every model

Export