What color is #2121EA?

#2121EA is a medium, vivid blue. In RGB it is rgb(33, 33, 234), and in HSL hsl(240, 83%, 52%).

Is #2121EA accessible as text?

On white, #2121EA has a contrast ratio of 8.50:1 (passes WCAG AA for body text); on black it is 2.47:1 (fails). For text placed on #2121EA, use white for the best readability.

What is the closest Tailwind color to #2121EA?

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

What colors go well with #2121EA?

#2121EA pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EAEA1F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #2121EA below.

Is #2121EA good for buttons?

#2121EA works well for buttons and highlights, but use white text on #2121EA — black text only reaches 2.47:1, below the 4.5:1 needed for normal-size labels.

Is #2121EA the same as CSS blue?

No — #2121EA is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#2121EA Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2121EA

Not just a swatch — here's how #2121EA works with other colors. Named schemes with #2121EA in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #2121EA Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #3A5FFF

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 Blue.

Coastal Morning Lead · 5 colors

Lead #2121EA Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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 #2121EA Surface #F6E5D8 Anchor #5B2143 Accent #E5C2CA Secondary #322B2F

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 #2121EA Secondary #647AB7 Support #9D8F88 Ink #18140F

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 Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #2121EA Secondary #E86A74 Accent #F79250 Anchor #573B58 Surface #F7E7D7

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 #2121EA 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 21/100

Low

Firm and assertive — carries weight and contrast.

Depth 62/100

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 0/100

Very low

Clean and current — no dusty, aged cast.

Luxury 49/100

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 42/100

Moderate

Workable accent with care around contrast.

Surface fit 11/100

Very low

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

Print safety 51/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #2121EA

For UI

For branding

For interior

For fashion

People also use #2121EA with

Picton Blue Blue Violet Pear 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 8.5:1. Use

Subtle surface Use #D8D8F5 for cards and hover fills. Tint 80

Avoid beside #631FEA — 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 #2121EA 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: #2121EA;
  --color-base-rgb: 33 33 234;
  --color-base-oklch: oklch(44.8% 0.277 267.7);
  --color-50: #F0F0FE;
  --color-100: #D9D9FD;
  --color-200: #B4B4F8;
  --color-300: #8282ED;
  --color-400: #5454DE;
  --color-500: #3131C3;
  --color-600: #2D2D95;
  --color-700: #262669;
  --color-800: #1C1C44;
  --color-900: #13132A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  blue: {
    50: '#F0F0FE',
    100: '#D9D9FD',
    200: '#B4B4F8',
    300: '#8282ED',
    400: '#5454DE',
    500: '#3131C3',
    600: '#2D2D95',
    700: '#262669',
    800: '#1C1C44',
    900: '#13132A',
  },
}

$base: #2121EA;
$base-ink: #FFFFFF;
$base-50: #F0F0FE;
$base-100: #D9D9FD;
$base-200: #B4B4F8;
$base-300: #8282ED;
$base-400: #5454DE;
$base-500: #3131C3;
$base-600: #2D2D95;
$base-700: #262669;
$base-800: #1C1C44;
$base-900: #13132A;
$base-hover: #1212C2;
$base-subtle: #C3C3F1;

{
    "color": {
        "base": {
            "value": "#2121EA",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F0FE",
                "type": "color"
            },
            "100": {
                "value": "#D9D9FD",
                "type": "color"
            },
            "200": {
                "value": "#B4B4F8",
                "type": "color"
            },
            "300": {
                "value": "#8282ED",
                "type": "color"
            },
            "400": {
                "value": "#5454DE",
                "type": "color"
            },
            "500": {
                "value": "#3131C3",
                "type": "color"
            },
            "600": {
                "value": "#2D2D95",
                "type": "color"
            },
            "700": {
                "value": "#262669",
                "type": "color"
            },
            "800": {
                "value": "#1C1C44",
                "type": "color"
            },
            "900": {
                "value": "#13132A",
                "type": "color"
            }
        }
    }
}

Palettes built on #2121EA

Color Lab

Pairs with #2121EA

UI roles & guardrails

In real applications

Scales

Every model

Export