What color is #123EEF?

#123EEF is a medium, vivid blue. In RGB it is rgb(18, 62, 239), and in HSL hsl(228, 87%, 50%).

Is #123EEF accessible as text?

On white, #123EEF has a contrast ratio of 7.09:1 (passes WCAG AA for body text); on black it is 2.96:1 (fails). For text placed on #123EEF, use white for the best readability.

What is the closest Tailwind color to #123EEF?

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

What colors go well with #123EEF?

#123EEF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EEC211. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #123EEF below.

Is #123EEF good for buttons?

#123EEF works well for buttons and highlights, but use white text on #123EEF — black text only reaches 2.96:1, below the 4.5:1 needed for normal-size labels.

Is #123EEF the same as CSS blue?

No — #123EEF is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#123EEF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #123EEF

Not just a swatch — here's how #123EEF works with other colors. Named schemes with #123EEF in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #123EEF Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3870FF

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 #123EEF Accent #A5C4C2 Surface #DDDBBF 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 #123EEF Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA 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 #123EEF Secondary #6C86BF 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 #123EEF Secondary #E76A75 Accent #F79251 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 #123EEF 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 9/100

Cool

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

Softness 24/100

Low

Firm and assertive — carries weight and contrast.

Depth 58/100

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 3/100

Very low

Clean and current — no dusty, aged cast.

Luxury 48/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 100/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 53/100

Moderate

Workable accent with care around contrast.

Surface fit 9/100

Very low

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

Print safety 52/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #123EEF

For UI

For branding

For interior

For fashion

People also use #123EEF with

Lagoon Blue Han Purple Mustard Yellow Gainsboro Gunmetal Gray

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 7.1:1. Use

Subtle surface Use #D6DCF5 for cards and hover fills. Tint 80

Avoid beside #2E11EE — 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 #123EEF 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: #123EEF;
  --color-base-rgb: 18 62 239;
  --color-base-oklch: oklch(48.3% 0.263 264.9);
  --color-50: #F0F3FE;
  --color-100: #D8DFFD;
  --color-200: #B3C1FA;
  --color-300: #7F96F0;
  --color-400: #516EE1;
  --color-500: #2E4CC7;
  --color-600: #2B4097;
  --color-700: #24326B;
  --color-800: #1C2445;
  --color-900: #13182A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  neon-blue: {
    50: '#F0F3FE',
    100: '#D8DFFD',
    200: '#B3C1FA',
    300: '#7F96F0',
    400: '#516EE1',
    500: '#2E4CC7',
    600: '#2B4097',
    700: '#24326B',
    800: '#1C2445',
    900: '#13182A',
  },
}

$base: #123EEF;
$base-ink: #FFFFFF;
$base-50: #F0F3FE;
$base-100: #D8DFFD;
$base-200: #B3C1FA;
$base-300: #7F96F0;
$base-400: #516EE1;
$base-500: #2E4CC7;
$base-600: #2B4097;
$base-700: #24326B;
$base-800: #1C2445;
$base-900: #13182A;
$base-hover: #0D31BF;
$base-subtle: #BFCAF2;

{
    "color": {
        "base": {
            "value": "#123EEF",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F3FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DFFD",
                "type": "color"
            },
            "200": {
                "value": "#B3C1FA",
                "type": "color"
            },
            "300": {
                "value": "#7F96F0",
                "type": "color"
            },
            "400": {
                "value": "#516EE1",
                "type": "color"
            },
            "500": {
                "value": "#2E4CC7",
                "type": "color"
            },
            "600": {
                "value": "#2B4097",
                "type": "color"
            },
            "700": {
                "value": "#24326B",
                "type": "color"
            },
            "800": {
                "value": "#1C2445",
                "type": "color"
            },
            "900": {
                "value": "#13182A",
                "type": "color"
            }
        }
    }
}

Palettes built on #123EEF

Color Lab

Pairs with #123EEF

UI roles & guardrails

In real applications

Scales

Every model

Export