What color is #3D40EF?

#3D40EF is a medium, vivid blue. In RGB it is rgb(61, 64, 239), and in HSL hsl(239, 85%, 59%).

Is #3D40EF accessible as text?

On white, #3D40EF has a contrast ratio of 6.61:1 (passes WCAG AA for body text); on black it is 3.18:1 (fails). For text placed on #3D40EF, use white for the best readability.

What is the closest Tailwind color to #3D40EF?

The nearest Tailwind CSS token is indigo-600 (#4F39F6).

What colors go well with #3D40EF?

#3D40EF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EFEC3E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3D40EF below.

Is #3D40EF good for buttons?

#3D40EF works well for buttons and highlights, but use white text on #3D40EF — black text only reaches 3.18:1, below the 4.5:1 needed for normal-size labels.

Is #3D40EF the same as CSS blue?

No — #3D40EF is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#3D40EF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3D40EF

Not just a swatch — here's how #3D40EF works with other colors. Named schemes with #3D40EF in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #3D40EF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5C71FF

Neon Blue 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 Blue.

Coastal Morning Lead · 5 colors

Lead #3D40EF Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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

Berry & Cream Lead · 5 colors

Lead #3D40EF Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Neon Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #3D40EF Secondary #7989C2 Support #9D8F88 Ink #18140F

Neon Blue 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 Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #3D40EF Secondary #E86A73 Accent #F6924F Anchor #573B58 Surface #F7E7D7

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

Build a working theme in the generator →

Color Lab

How #3D40EF 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 13/100

Cool

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

Softness 26/100

Low

Firm and assertive — carries weight and contrast.

Depth 55/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 7/100

Very low

Clean and current — no dusty, aged cast.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 97/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 60/100

Moderate

Workable accent with care around contrast.

Surface fit 8/100

Very low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 58/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #3D40EF

For UI

For branding

For interior

For fashion

People also use #3D40EF with

Picton Blue Blue Violet Pear Gainsboro Prussian Blue

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 6.6:1. Use

Subtle surface Use #DDDEF7 for cards and hover fills. Tint 80

Avoid beside #763EEF — 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 #3D40EF 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: #3D40EF;
  --color-base-rgb: 61 64 239;
  --color-base-oklch: oklch(50.1% 0.252 272.0);
  --color-50: #F0F1FE;
  --color-100: #D8D9FD;
  --color-200: #B4B5F9;
  --color-300: #8183EE;
  --color-400: #5355DF;
  --color-500: #3032C5;
  --color-600: #2C2E96;
  --color-700: #25266A;
  --color-800: #1C1D45;
  --color-900: #13132A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  neon-blue: {
    50: '#F0F1FE',
    100: '#D8D9FD',
    200: '#B4B5F9',
    300: '#8183EE',
    400: '#5355DF',
    500: '#3032C5',
    600: '#2C2E96',
    700: '#25266A',
    800: '#1C1D45',
    900: '#13132A',
  },
}

$base: #3D40EF;
$base-ink: #FFFFFF;
$base-50: #F0F1FE;
$base-100: #D8D9FD;
$base-200: #B4B5F9;
$base-300: #8183EE;
$base-400: #5355DF;
$base-500: #3032C5;
$base-600: #2C2E96;
$base-700: #25266A;
$base-800: #1C1D45;
$base-900: #13132A;
$base-hover: #1215DF;
$base-subtle: #CBCCF4;

{
    "color": {
        "base": {
            "value": "#3D40EF",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F1FE",
                "type": "color"
            },
            "100": {
                "value": "#D8D9FD",
                "type": "color"
            },
            "200": {
                "value": "#B4B5F9",
                "type": "color"
            },
            "300": {
                "value": "#8183EE",
                "type": "color"
            },
            "400": {
                "value": "#5355DF",
                "type": "color"
            },
            "500": {
                "value": "#3032C5",
                "type": "color"
            },
            "600": {
                "value": "#2C2E96",
                "type": "color"
            },
            "700": {
                "value": "#25266A",
                "type": "color"
            },
            "800": {
                "value": "#1C1D45",
                "type": "color"
            },
            "900": {
                "value": "#13132A",
                "type": "color"
            }
        }
    }
}

Palettes built on #3D40EF

Color Lab

Pairs with #3D40EF

UI roles & guardrails

In real applications

Scales

Every model

Export