What color is #856FFB?

#856FFB is a light, vivid indigo. In RGB it is rgb(133, 111, 251), and in HSL hsl(249, 95%, 71%).

Is #856FFB accessible as text?

On white, #856FFB has a contrast ratio of 3.71:1 (fails WCAG AA for body text); on black it is 5.66:1 (passes). For text placed on #856FFB, use black for the best readability.

What is the closest Tailwind color to #856FFB?

The nearest Tailwind CSS token is indigo-400 (#7C86FF).

What colors go well with #856FFB?

#856FFB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #E6FB6F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #856FFB below.

Is #856FFB good for buttons?

#856FFB works well for buttons and highlights, but use black text on #856FFB — white text only reaches 3.71:1, below the 4.5:1 needed for normal-size labels.

Is #856FFB the same as CSS mediumslateblue?

No — #856FFB is not the CSS named color mediumslateblue, but mediumslateblue (#7B68EE) is the closest CSS named color.

#856FFB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #856FFB

Not just a swatch — here's how #856FFB works with other colors. Named schemes with #856FFB in its natural role, and a note on why the supporting colors balance it.

Nordic Calm Accent · 5 colors

Accent #856FFB Secondary #AFB4B8 Surface #F1F2F0 Support #7E92A7 Anchor #2E3236

Medium Slate Blue 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 #856FFB Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #A89AFF

Medium Slate 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 Slate Blue.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #856FFB Secondary #B1AFE1 Support #9D9088 Ink #18140F

Medium Slate 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 Slate Blue carrying the quiet middle.

Japanese Sand Base · 5 colors

Base #856FFB Surface #F2E8DD Highlight #F8F0E7 Secondary #BEADA2 Ink #2C2724

Medium Slate Blue sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Sunset Warmth Glow · 5 colors

Glow #856FFB Secondary #E86A6F Accent #F5934C Anchor #583B57 Surface #F7E7D7

Medium Slate 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 #856FFB 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 22/100

Cool

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

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 39/100

Low

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 24/100

Low

Clean and current — no dusty, aged cast.

Luxury 40/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 77/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 72/100

High

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

Surface fit 20/100

Low

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

Print safety 72/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #856FFB

For UI

For branding

For interior

For fashion

People also use #856FFB with

Maya Blue Heliotrope Flax Gainsboro Prussian Blue

UI roles & guardrails

Primary action Safe as a filled button with near-black label. AA

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 5.0:1. Use

Subtle surface Use #E9E6FA for cards and hover fills. Tint 80

Avoid beside #B36FFB — 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 #856FFB 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: #856FFB;
  --color-base-rgb: 133 111 251;
  --color-base-oklch: oklch(63.3% 0.200 286.4);
  --color-50: #F2F0FE;
  --color-100: #DDD8FD;
  --color-200: #BCB1FC;
  --color-300: #8D7AF5;
  --color-400: #624AE8;
  --color-500: #4027CE;
  --color-600: #38269C;
  --color-700: #2D216E;
  --color-800: #201A47;
  --color-900: #16122B;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  medium-slate-blue: {
    50: '#F2F0FE',
    100: '#DDD8FD',
    200: '#BCB1FC',
    300: '#8D7AF5',
    400: '#624AE8',
    500: '#4027CE',
    600: '#38269C',
    700: '#2D216E',
    800: '#201A47',
    900: '#16122B',
  },
}

$base: #856FFB;
$base-ink: #141310;
$base-50: #F2F0FE;
$base-100: #DDD8FD;
$base-200: #BCB1FC;
$base-300: #8D7AF5;
$base-400: #624AE8;
$base-500: #4027CE;
$base-600: #38269C;
$base-700: #2D216E;
$base-800: #201A47;
$base-900: #16122B;
$base-hover: #4828F9;
$base-subtle: #DED9F9;

{
    "color": {
        "base": {
            "value": "#856FFB",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F0FE",
                "type": "color"
            },
            "100": {
                "value": "#DDD8FD",
                "type": "color"
            },
            "200": {
                "value": "#BCB1FC",
                "type": "color"
            },
            "300": {
                "value": "#8D7AF5",
                "type": "color"
            },
            "400": {
                "value": "#624AE8",
                "type": "color"
            },
            "500": {
                "value": "#4027CE",
                "type": "color"
            },
            "600": {
                "value": "#38269C",
                "type": "color"
            },
            "700": {
                "value": "#2D216E",
                "type": "color"
            },
            "800": {
                "value": "#201A47",
                "type": "color"
            },
            "900": {
                "value": "#16122B",
                "type": "color"
            }
        }
    }
}

Palettes built on #856FFB

Color Lab

Pairs with #856FFB

UI roles & guardrails

In real applications

Scales

Every model

Export