What color is #121BC0?

#121BC0 is a medium, vivid blue. In RGB it is rgb(18, 27, 192), and in HSL hsl(237, 83%, 41%).

Is #121BC0 accessible as text?

On white, #121BC0 has a contrast ratio of 10.80:1 (passes WCAG AA for body text); on black it is 1.94:1 (fails). For text placed on #121BC0, use white for the best readability.

What is the closest Tailwind color to #121BC0?

The nearest Tailwind CSS token is blue-800 (#193CB8).

What colors go well with #121BC0?

#121BC0 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BFB712. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #121BC0 below.

Is #121BC0 good for buttons?

#121BC0 works well for buttons and highlights, but use white text on #121BC0 — black text only reaches 1.94:1, below the 4.5:1 needed for normal-size labels.

Is #121BC0 the same as CSS mediumblue?

No — #121BC0 is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#121BC0 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #121BC0

Not just a swatch — here's how #121BC0 works with other colors. Named schemes with #121BC0 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #121BC0 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #2C53DD

Medium 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 Medium Blue.

Coastal Morning Lead · 5 colors

Lead #121BC0 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Medium 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 #121BC0 Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Medium 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 #121BC0 Secondary #54699B Support #9D8F88 Ink #18140F

Medium 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 Medium Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #121BC0 Secondary #E86A74 Accent #F79251 Anchor #573B58 Surface #F7E7D7

Medium 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 #121BC0 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 10/100

Cool

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

Softness 22/100

Low

Firm and assertive — carries weight and contrast.

Depth 68/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 9/100

Very low

Clean and current — no dusty, aged cast.

Luxury 57/100

Moderate

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 92/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 47/100

Moderate

Workable accent with care around contrast.

Surface fit 15/100

Very low

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

Print safety 57/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #121BC0

For UI

For branding

For interior

For fashion

People also use #121BC0 with

Dodger Blue Grape Citron 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 10.8:1. Use

Subtle surface Use #CFD1F3 for cards and hover fills. Tint 80

Avoid beside #4312BF — 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 #121BC0 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: #121BC0;
  --color-base-rgb: 18 27 192;
  --color-base-oklch: oklch(38.6% 0.239 266.4);
  --color-50: #F0F1FE;
  --color-100: #D9DAFD;
  --color-200: #B4B8F8;
  --color-300: #8287ED;
  --color-400: #545BDE;
  --color-500: #3139C3;
  --color-600: #2D3295;
  --color-700: #262969;
  --color-800: #1C1E44;
  --color-900: #13142A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  medium-blue: {
    50: '#F0F1FE',
    100: '#D9DAFD',
    200: '#B4B8F8',
    300: '#8287ED',
    400: '#545BDE',
    500: '#3139C3',
    600: '#2D3295',
    700: '#262969',
    800: '#1C1E44',
    900: '#13142A',
  },
}

$base: #121BC0;
$base-ink: #FFFFFF;
$base-50: #F0F1FE;
$base-100: #D9DAFD;
$base-200: #B4B8F8;
$base-300: #8287ED;
$base-400: #545BDE;
$base-500: #3139C3;
$base-600: #2D3295;
$base-700: #262969;
$base-800: #1C1E44;
$base-900: #13142A;
$base-hover: #0E1599;
$base-subtle: #B5B8EE;

{
    "color": {
        "base": {
            "value": "#121BC0",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F1FE",
                "type": "color"
            },
            "100": {
                "value": "#D9DAFD",
                "type": "color"
            },
            "200": {
                "value": "#B4B8F8",
                "type": "color"
            },
            "300": {
                "value": "#8287ED",
                "type": "color"
            },
            "400": {
                "value": "#545BDE",
                "type": "color"
            },
            "500": {
                "value": "#3139C3",
                "type": "color"
            },
            "600": {
                "value": "#2D3295",
                "type": "color"
            },
            "700": {
                "value": "#262969",
                "type": "color"
            },
            "800": {
                "value": "#1C1E44",
                "type": "color"
            },
            "900": {
                "value": "#13142A",
                "type": "color"
            }
        }
    }
}

Palettes built on #121BC0

Color Lab

Pairs with #121BC0

UI roles & guardrails

In real applications

Scales

Every model

Export