What color is #EFF305?

#EFF305 is a medium, vivid yellow. In RGB it is rgb(239, 243, 5), and in HSL hsl(61, 96%, 49%).

Is #EFF305 accessible as text?

On white, #EFF305 has a contrast ratio of 1.20:1 (fails WCAG AA for body text); on black it is 17.49:1 (passes). For text placed on #EFF305, use black for the best readability.

What is the closest Tailwind color to #EFF305?

The nearest Tailwind CSS token is yellow-300 (#FFDF20).

What colors go well with #EFF305?

#EFF305 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #0905F5. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #EFF305 below.

Is #EFF305 good for buttons?

#EFF305 works well for buttons and highlights, but use black text on #EFF305 — white text only reaches 1.20:1, below the 4.5:1 needed for normal-size labels.

Is #EFF305 the same as CSS yellow?

No — #EFF305 is not the CSS named color yellow, but yellow (#FFFF00) is the closest CSS named color.

#EFF305 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #EFF305

Not just a swatch — here's how #EFF305 works with other colors. Named schemes with #EFF305 in its natural role, and a note on why the supporting colors balance it.

Sunset Warmth Glow · 5 colors

Glow #EFF305 Secondary #E4743A Accent #DFA327 Anchor #5F394B Surface #F2E9D6

Canary Yellow glows at the center of this sunset palette, joined by coral and gold, deepened by a plum anchor and cooled with cream.

Japanese Sand Base · 5 colors

Base #EFF305 Surface #EFE9DC Highlight #F6F1E7 Secondary #B8B09F Ink #2B2723

Canary Yellow 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.

Warm Autumn Interior Dominant · 5 colors

Dominant #EFF305 Secondary #B16907 Accent #6D7B49 Surface #F2ECDD Anchor #3A2B1F

This palette keeps Canary Yellow 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 #EFF305 Secondary #FCFFC8 Support #999186 Ink #17140F

Canary Yellow 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 Canary Yellow carrying the quiet middle.

Luxury Packaging Feature · 5 colors

Feature #EFF305 Anchor #141210 Accent #C5A44B Secondary #292A1F Surface #F2EDE3

Canary Yellow carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Build a working theme in the generator →

Color Lab

How #EFF305 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 74/100

Warm

Reads warm and advancing — inviting, energetic, draws the eye forward.

Softness 55/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 8/100

Very low

Airy and open — recedes, leaves the composition light.

Naturalness 25/100

Low

Loosely natural — an earthy edge without being rustic.

Vintage feel 15/100

Very low

Clean and current — no dusty, aged cast.

Luxury 11/100

Very low

Playful and accessible rather than exclusive.

Brand distinctiveness 79/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 5/100

Very low

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

Surface fit 48/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 62/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #EFF305

For UI

For branding

For interior

For fashion

People also use #EFF305 with

Dark Orange Lawn Green Medium Blue Platinum Army 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 15.5:1. Use

Subtle surface Use #F6F7D3 for cards and hover fills. Tint 80

Avoid beside #A1F505 — 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 #EFF305 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: #EFF305;
  --color-base-rgb: 239 243 5;
  --color-base-oklch: oklch(93.0% 0.204 111.0);
  --color-50: #FEFEF0;
  --color-100: #FDFDD8;
  --color-200: #FAFCB1;
  --color-300: #F3F67A;
  --color-400: #E6E84A;
  --color-500: #CCCF26;
  --color-600: #9B9D25;
  --color-700: #6D6E21;
  --color-800: #474819;
  --color-900: #2B2C12;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  canary-yellow: {
    50: '#FEFEF0',
    100: '#FDFDD8',
    200: '#FAFCB1',
    300: '#F3F67A',
    400: '#E6E84A',
    500: '#CCCF26',
    600: '#9B9D25',
    700: '#6D6E21',
    800: '#474819',
    900: '#2B2C12',
  },
}

$base: #EFF305;
$base-ink: #141310;
$base-50: #FEFEF0;
$base-100: #FDFDD8;
$base-200: #FAFCB1;
$base-300: #F3F67A;
$base-400: #E6E84A;
$base-500: #CCCF26;
$base-600: #9B9D25;
$base-700: #6D6E21;
$base-800: #474819;
$base-900: #2B2C12;
$base-hover: #C1C404;
$base-subtle: #F4F4BC;

{
    "color": {
        "base": {
            "value": "#EFF305",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#FEFEF0",
                "type": "color"
            },
            "100": {
                "value": "#FDFDD8",
                "type": "color"
            },
            "200": {
                "value": "#FAFCB1",
                "type": "color"
            },
            "300": {
                "value": "#F3F67A",
                "type": "color"
            },
            "400": {
                "value": "#E6E84A",
                "type": "color"
            },
            "500": {
                "value": "#CCCF26",
                "type": "color"
            },
            "600": {
                "value": "#9B9D25",
                "type": "color"
            },
            "700": {
                "value": "#6D6E21",
                "type": "color"
            },
            "800": {
                "value": "#474819",
                "type": "color"
            },
            "900": {
                "value": "#2B2C12",
                "type": "color"
            }
        }
    }
}

Palettes built on #EFF305

Color Lab

Pairs with #EFF305

UI roles & guardrails

In real applications

Scales

Every model

Export