What color is #2127BF?

#2127BF is a medium, vivid blue. In RGB it is rgb(33, 39, 191), and in HSL hsl(238, 71%, 44%).

Is #2127BF accessible as text?

On white, #2127BF has a contrast ratio of 9.97:1 (passes WCAG AA for body text); on black it is 2.11:1 (fails). For text placed on #2127BF, use white for the best readability.

What is the closest Tailwind color to #2127BF?

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

What colors go well with #2127BF?

#2127BF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C0BB21. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #2127BF below.

Is #2127BF good for buttons?

#2127BF works well for buttons and highlights, but use white text on #2127BF — black text only reaches 2.11:1, below the 4.5:1 needed for normal-size labels.

Is #2127BF the same as CSS mediumblue?

No — #2127BF is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#2127BF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2127BF

Not just a swatch — here's how #2127BF works with other colors. Named schemes with #2127BF in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #2127BF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #3D59DC

Klein 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 Klein Blue.

Coastal Morning Lead · 5 colors

Lead #2127BF Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Klein 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 #2127BF Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Klein 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 #2127BF Secondary #5D6D9E Support #9D8F88 Ink #18140F

Klein 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 Klein Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #2127BF Secondary #E86A74 Accent #F69250 Anchor #573B58 Surface #F7E7D7

Klein 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 #2127BF 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 11/100

Cool

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

Softness 24/100

Low

Firm and assertive — carries weight and contrast.

Depth 65/100

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 13/100

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 87/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 56/100

Moderate

Workable accent with care around contrast.

Surface fit 14/100

Very low

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

Print safety 61/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #2127BF

For UI

For branding

For interior

For fashion

People also use #2127BF with

Carolina Blue Grape Peridot 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 10.0:1. Use

Subtle surface Use #D4D5F1 for cards and hover fills. Tint 80

Avoid beside #5021C0 — 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 #2127BF 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: #2127BF;
  --color-base-rgb: 33 39 191;
  --color-base-oklch: oklch(40.3% 0.226 269.0);
  --color-50: #F1F2FD;
  --color-100: #DBDCFA;
  --color-200: #B9BBF3;
  --color-300: #8A8DE5;
  --color-400: #5E62D4;
  --color-500: #3C40B9;
  --color-600: #35388D;
  --color-700: #2B2D64;
  --color-800: #1F2142;
  --color-900: #151628;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  klein-blue: {
    50: '#F1F2FD',
    100: '#DBDCFA',
    200: '#B9BBF3',
    300: '#8A8DE5',
    400: '#5E62D4',
    500: '#3C40B9',
    600: '#35388D',
    700: '#2B2D64',
    800: '#1F2142',
    900: '#151628',
  },
}

$base: #2127BF;
$base-ink: #FFFFFF;
$base-50: #F1F2FD;
$base-100: #DBDCFA;
$base-200: #B9BBF3;
$base-300: #8A8DE5;
$base-400: #5E62D4;
$base-500: #3C40B9;
$base-600: #35388D;
$base-700: #2B2D64;
$base-800: #1F2142;
$base-900: #151628;
$base-hover: #1A1E99;
$base-subtle: #BDBFEB;

{
    "color": {
        "base": {
            "value": "#2127BF",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F2FD",
                "type": "color"
            },
            "100": {
                "value": "#DBDCFA",
                "type": "color"
            },
            "200": {
                "value": "#B9BBF3",
                "type": "color"
            },
            "300": {
                "value": "#8A8DE5",
                "type": "color"
            },
            "400": {
                "value": "#5E62D4",
                "type": "color"
            },
            "500": {
                "value": "#3C40B9",
                "type": "color"
            },
            "600": {
                "value": "#35388D",
                "type": "color"
            },
            "700": {
                "value": "#2B2D64",
                "type": "color"
            },
            "800": {
                "value": "#1F2142",
                "type": "color"
            },
            "900": {
                "value": "#151628",
                "type": "color"
            }
        }
    }
}

Palettes built on #2127BF

Color Lab

Pairs with #2127BF

UI roles & guardrails

In real applications

Scales

Every model

Export