What color is #657CA4?

#657CA4 is a medium, muted blue. In RGB it is rgb(101, 124, 164), and in HSL hsl(218, 26%, 52%).

Is #657CA4 accessible as text?

On white, #657CA4 has a contrast ratio of 4.22:1 (fails WCAG AA for body text); on black it is 4.97:1 (passes). For text placed on #657CA4, use black for the best readability.

What is the closest Tailwind color to #657CA4?

The nearest Tailwind CSS token is mist-500 (#67787C).

What colors go well with #657CA4?

#657CA4 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A48D65. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #657CA4 below.

Is #657CA4 good for buttons?

#657CA4 works well for buttons and highlights, but use black text on #657CA4 — white text only reaches 4.22:1, below the 4.5:1 needed for normal-size labels.

Is #657CA4 the same as CSS slategray?

No — #657CA4 is not the CSS named color slategray, but slategray (#708090) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#657CA4 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #657CA4

Not just a swatch — here's how #657CA4 works with other colors. Named schemes with #657CA4 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #657CA4 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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

Nordic Calm Accent · 5 colors

Accent #657CA4 Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Glaucous keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #657CA4 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #8BA0C6

Glaucous is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Glaucous.

Vintage Leather Lead · 5 colors

Lead #657CA4 Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

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

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #657CA4 Secondary #9EA6B5 Support #9D8F88 Ink #18140F

Glaucous 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 Glaucous carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #657CA4 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 33/100

Cool

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

Softness 53/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 40/100

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 53/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 18/100

Very low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 77/100

High

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

Surface fit 40/100

Low

Usable as a tinted surface in measured doses.

Print safety 87/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #657CA4

For UI

For branding

For interior

For fashion

People also use #657CA4 with

Cadet Grey Very Peri Beaver Gainsboro Charcoal

UI roles & guardrails

Primary action Too mid-tone for a filled button — darken for the fill. AA Large

Body text Do not use for body copy on light surfaces. Avoid

Large display Fine for headings 24px+ on white. Pass

Background Pair with #141310 text at 4.4:1. Use

Subtle surface Use #E2E5EB for cards and hover fills. Tint 80

Avoid beside #6567A4 — 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 #657CA4 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: #657CA4;
  --color-base-rgb: 101 124 164;
  --color-base-oklch: oklch(58.4% 0.067 261.3);
  --color-50: #F5F7FA;
  --color-100: #E5E9F0;
  --color-200: #CCD3E1;
  --color-300: #A7B3C8;
  --color-400: #8393AF;
  --color-500: #647491;
  --color-600: #515D71;
  --color-700: #3D4552;
  --color-800: #2A2F37;
  --color-900: #1B1E22;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  glaucous: {
    50: '#F5F7FA',
    100: '#E5E9F0',
    200: '#CCD3E1',
    300: '#A7B3C8',
    400: '#8393AF',
    500: '#647491',
    600: '#515D71',
    700: '#3D4552',
    800: '#2A2F37',
    900: '#1B1E22',
  },
}

$base: #657CA4;
$base-ink: #141310;
$base-50: #F5F7FA;
$base-100: #E5E9F0;
$base-200: #CCD3E1;
$base-300: #A7B3C8;
$base-400: #8393AF;
$base-500: #647491;
$base-600: #515D71;
$base-700: #3D4552;
$base-800: #2A2F37;
$base-900: #1B1E22;
$base-hover: #4E6386;
$base-subtle: #D3D8E2;

{
    "color": {
        "base": {
            "value": "#657CA4",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F7FA",
                "type": "color"
            },
            "100": {
                "value": "#E5E9F0",
                "type": "color"
            },
            "200": {
                "value": "#CCD3E1",
                "type": "color"
            },
            "300": {
                "value": "#A7B3C8",
                "type": "color"
            },
            "400": {
                "value": "#8393AF",
                "type": "color"
            },
            "500": {
                "value": "#647491",
                "type": "color"
            },
            "600": {
                "value": "#515D71",
                "type": "color"
            },
            "700": {
                "value": "#3D4552",
                "type": "color"
            },
            "800": {
                "value": "#2A2F37",
                "type": "color"
            },
            "900": {
                "value": "#1B1E22",
                "type": "color"
            }
        }
    }
}

Palettes built on #657CA4

Color Lab

Pairs with #657CA4

UI roles & guardrails

In real applications

Scales

Every model

Export