What color is #2173BB?

#2173BB is a medium, vivid blue. In RGB it is rgb(33, 115, 187), and in HSL hsl(208, 70%, 43%).

Is #2173BB accessible as text?

On white, #2173BB has a contrast ratio of 4.96:1 (passes WCAG AA for body text); on black it is 4.23:1 (fails). For text placed on #2173BB, use white for the best readability.

What is the closest Tailwind color to #2173BB?

The nearest Tailwind CSS token is sky-700 (#0069A8).

What colors go well with #2173BB?

#2173BB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BA6921. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #2173BB below.

Is #2173BB good for buttons?

#2173BB works well for buttons and highlights, but use white text on #2173BB — black text only reaches 4.23:1, below the 4.5:1 needed for normal-size labels.

Is #2173BB the same as CSS steelblue?

No — #2173BB is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#2173BB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2173BB

Not just a swatch — here's how #2173BB works with other colors. Named schemes with #2173BB in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #2173BB Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

True Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Tech Product Signal · 5 colors

Signal #2173BB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5498DB

True 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 True Blue.

Vintage Leather Lead · 5 colors

Lead #2173BB Secondary #7F4538 Surface #E1DDC0 Accent #375245 Anchor #57233B

True Blue plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Berry & Cream Lead · 5 colors

Lead #2173BB Surface #EDE9D6 Anchor #5A2245 Accent #E4C2CB Secondary #322B2F

True Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #2173BB Secondary #849CB6 Support #959386 Ink #16140F

True 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 True Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #2173BB 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 42/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 47/100

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 45/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 52/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 37/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 100/100

Very high

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

Surface fit 15/100

Very low

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

Print safety 70/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #2173BB

For UI

For branding

For interior

For fashion

People also use #2173BB with

Turquoise Klein Blue Copper Gainsboro Charcoal

UI roles & guardrails

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

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 5.0:1. Use

Subtle surface Use #D3E3F1 for cards and hover fills. Tint 80

Avoid beside #2140BA — 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 #2173BB at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #2173BB;
  --color-base-rgb: 33 115 187;
  --color-base-oklch: oklch(54.4% 0.136 249.8);
  --color-50: #F1F8FD;
  --color-100: #DBECFA;
  --color-200: #BAD8F3;
  --color-300: #8ABBE5;
  --color-400: #5F9DD3;
  --color-500: #3D7FB8;
  --color-600: #35648C;
  --color-700: #2B4964;
  --color-800: #203241;
  --color-900: #151F28;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  true-blue: {
    50: '#F1F8FD',
    100: '#DBECFA',
    200: '#BAD8F3',
    300: '#8ABBE5',
    400: '#5F9DD3',
    500: '#3D7FB8',
    600: '#35648C',
    700: '#2B4964',
    800: '#203241',
    900: '#151F28',
  },
}

$base: #2173BB;
$base-ink: #FFFFFF;
$base-50: #F1F8FD;
$base-100: #DBECFA;
$base-200: #BAD8F3;
$base-300: #8ABBE5;
$base-400: #5F9DD3;
$base-500: #3D7FB8;
$base-600: #35648C;
$base-700: #2B4964;
$base-800: #203241;
$base-900: #151F28;
$base-hover: #1A5C95;
$base-subtle: #BCD5EB;

{
    "color": {
        "base": {
            "value": "#2173BB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F8FD",
                "type": "color"
            },
            "100": {
                "value": "#DBECFA",
                "type": "color"
            },
            "200": {
                "value": "#BAD8F3",
                "type": "color"
            },
            "300": {
                "value": "#8ABBE5",
                "type": "color"
            },
            "400": {
                "value": "#5F9DD3",
                "type": "color"
            },
            "500": {
                "value": "#3D7FB8",
                "type": "color"
            },
            "600": {
                "value": "#35648C",
                "type": "color"
            },
            "700": {
                "value": "#2B4964",
                "type": "color"
            },
            "800": {
                "value": "#203241",
                "type": "color"
            },
            "900": {
                "value": "#151F28",
                "type": "color"
            }
        }
    }
}

Palettes built on #2173BB

Color Lab

Pairs with #2173BB

UI roles & guardrails

In real applications

Scales

Every model

Export