What color is #343FDF?

#343FDF is a medium, vivid blue. In RGB it is rgb(52, 63, 223), and in HSL hsl(236, 73%, 54%).

Is #343FDF accessible as text?

On white, #343FDF has a contrast ratio of 7.19:1 (passes WCAG AA for body text); on black it is 2.92:1 (fails). For text placed on #343FDF, use white for the best readability.

What is the closest Tailwind color to #343FDF?

The nearest Tailwind CSS token is blue-700 (#1447E6).

What colors go well with #343FDF?

#343FDF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #DFD434. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #343FDF below.

Is #343FDF good for buttons?

#343FDF works well for buttons and highlights, but use white text on #343FDF — black text only reaches 2.92:1, below the 4.5:1 needed for normal-size labels.

Is #343FDF the same as CSS blue?

No — #343FDF is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#343FDF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #343FDF

Not just a swatch — here's how #343FDF works with other colors. Named schemes with #343FDF in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #343FDF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #536EFC

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 #343FDF 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 #343FDF 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 #343FDF Secondary #7383B8 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 #343FDF Secondary #E86A73 Accent #F69250 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 #343FDF 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 12/100

Cool

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

Softness 27/100

Low

Firm and assertive — carries weight and contrast.

Depth 57/100

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 12/100

Very low

Clean and current — no dusty, aged cast.

Luxury 50/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 91/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 66/100

High

Strong interactive accent — visible and can carry a legible label.

Surface fit 9/100

Very low

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

Print safety 60/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #343FDF

For UI

For branding

For interior

For fashion

People also use #343FDF with

Picton Blue Blue Violet Citrine Gainsboro Prussian Blue

UI roles & guardrails

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

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 7.2:1. Use

Subtle surface Use #DBDDF4 for cards and hover fills. Tint 80

Avoid beside #6234DF — 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 #343FDF 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: #343FDF;
  --color-base-rgb: 52 63 223;
  --color-base-oklch: oklch(47.9% 0.236 270.5);
  --color-50: #F1F2FD;
  --color-100: #DBDDFA;
  --color-200: #B9BCF4;
  --color-300: #888FE7;
  --color-400: #5D65D5;
  --color-500: #3A43BB;
  --color-600: #333A8E;
  --color-700: #2A2E65;
  --color-800: #1F2142;
  --color-900: #151628;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  neon-blue: {
    50: '#F1F2FD',
    100: '#DBDDFA',
    200: '#B9BCF4',
    300: '#888FE7',
    400: '#5D65D5',
    500: '#3A43BB',
    600: '#333A8E',
    700: '#2A2E65',
    800: '#1F2142',
    900: '#151628',
  },
}

$base: #343FDF;
$base-ink: #FFFFFF;
$base-50: #F1F2FD;
$base-100: #DBDDFA;
$base-200: #B9BCF4;
$base-300: #888FE7;
$base-400: #5D65D5;
$base-500: #3A43BB;
$base-600: #333A8E;
$base-700: #2A2E65;
$base-800: #1F2142;
$base-900: #151628;
$base-hover: #1E28BF;
$base-subtle: #C8CBEF;

{
    "color": {
        "base": {
            "value": "#343FDF",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F2FD",
                "type": "color"
            },
            "100": {
                "value": "#DBDDFA",
                "type": "color"
            },
            "200": {
                "value": "#B9BCF4",
                "type": "color"
            },
            "300": {
                "value": "#888FE7",
                "type": "color"
            },
            "400": {
                "value": "#5D65D5",
                "type": "color"
            },
            "500": {
                "value": "#3A43BB",
                "type": "color"
            },
            "600": {
                "value": "#333A8E",
                "type": "color"
            },
            "700": {
                "value": "#2A2E65",
                "type": "color"
            },
            "800": {
                "value": "#1F2142",
                "type": "color"
            },
            "900": {
                "value": "#151628",
                "type": "color"
            }
        }
    }
}

Palettes built on #343FDF

Color Lab

Pairs with #343FDF

UI roles & guardrails

In real applications

Scales

Every model

Export