Color detail

Dark Blue
#284B57

Dark Blue (#284B57) with RGB(40, 75, 87) and HSL(195, 37%, 25%). Suitable for modern interface themes, branding accents, and design systems.

CyanDarkcool

Generate harmony

Interactive

UI Sandbox

Project Dashboard

Active theme: Dark Blue

Values

Production-ready color values

Copy formats for CSS, handoff docs, tokens, and implementation.

HEX

#284B57

RGB

rgb(40, 75, 87)

HSL

hsl(195, 37%, 25%)

HSV

hsv(195, 54%, 34%)

CMYK

cmyk(54%, 14%, 0%, 66%)

Decimal

2640727

Contrast

Accessibility checks

On white

9.4:1

On black

2.23:1

Shades

Tonal scale

#0D181C #182D34 #284C57 #386A7A #48889D #62A1B7 #85B6C7 #A1C7D4 #C0DAE2 #E0ECF1

90080070060050040030020010050

Accessibility

Contrast Audit

On White

WCAG AA PASS

Text

9.40:1

On Black

FAIL

Text

2.23:1

Vision

Simulator

protanopia

deuteranopia

tritanopia

Harmonies

Palette combinations from this base color

Open any harmony as a shareable palette route and keep refining from there.

Complementary

Open palette

#284B57 #573428

Triadic

Open palette

#284C57 #57284C #4C5728

Analogous

Open palette

#28574C #285757 #284C57 #284057 #283457

Split complementary

Open palette

#284C57 #572834 #574C28

Tetradic

Open palette

#284C57 #4C2857 #573428 #345728

Monochromatic

Open palette

#203C46 #386A7A #5097AF #85B6C7 #B9D5DF

Analysis

Design expert profile

Detailed psychological and professional strategy for this specific tone.

Dark Blue (#284B57) with RGB(40, 75, 87) and HSL(195, 37%, 25%). Suitable for modern interface themes, branding accents, and design systems.

cyandarkcoolhex-284b57h-195s-37l-25

Region

Language

English Español

Developer Handoff

Copy for any framework

CSS

/* Dark Blue */
color: #284B57;
background-color: #284B57;
border-color: #284B57;
box-shadow: 0 4px 24px #284b5740;

Tailwind CSS

bg-[#284B57] text-[#284B57] border-[#284B57] ring-[#284B57]

SwiftUI

Color(red: 0.157, green: 0.294, blue: 0.341)

Flutter / Dart

Color(0xFF284B57)

Android XML

<color name="dark_blue">#284B57</color>

React Native

{ color: '#284B57' }

Social Media

Share this color

Beautiful swatches optimized for Pinterest, Instagram, and design moodboards.

Tip: Screenshots of this card are optimized for Pinterest (4:5 ratio).

Related colors

Nearby named colors

Brand Match

Closest real-world color

Farrow & Ball

Hague Blue

No. 30 · #2C4258

View this color →

About

About Dark Blue

This section gives the same kind of richer color context you’d expect from a dedicated color reference page.

Meaning

Dark Blue sits in the cyan family with a dark tone, so it holds enough weight for primary UI accents. It reads as calm, credible, and interface-friendly.

Applications

Dark Blue (#284B57) with RGB(40, 75, 87) and HSL(195, 37%, 25%). Suitable for modern interface themes, branding accents, and design systems. It performs better as text or iconography on lighter contexts when paired carefully.

Family

Cyan

Tone

Dark

Temperature

cool

Keywords

cyan, dark, cool, hex-284b57, h-195, s-37

Conversion

Color conversions

Use these values in CSS, product docs, design tokens, and print-oriented workflows.

HEX

#284B57

RGB

rgb(40, 75, 87)

HSL

hsl(195, 37%, 25%)

HSV

hsv(195, 54%, 34%)

CMYK

cmyk(54%, 14%, 0%, 66%)

Variations

Shades and tonal variations

Build softer surfaces, deeper states, and a cleaner tonal system from the same base hue.

#0D181C #182D34 #284C57 #386A7A #48889D #62A1B7 #85B6C7 #A1C7D4 #C0DAE2 #E0ECF1

900

#0D181C

800

#182D34

700

#284C57

600

#386A7A

500

#48889D

400

#62A1B7

Color harmonies

Harmony-based palette routes

Move from a single color into full palette ideas based on common harmony systems.

Complementary

Open palette

#284B57 #573428

Triadic

Open palette

#284C57 #57284C #4C5728

Analogous

Open palette

#28574C #285757 #284C57 #284057 #283457

Split complementary

Open palette

#284C57 #572834 #574C28

Tetradic

Open palette

#284C57 #4C2857 #573428 #345728

Monochromatic

Open palette

#203C46 #386A7A #5097AF #85B6C7 #B9D5DF

Blindness simulator

Color blindness preview

These simulations help you judge whether the color keeps enough identity across common color-vision variations.

Protanopia

#373754

Red-sensitive cones are reduced, so warm reds and greens can collapse toward similar mid-tones.

Deuteranopia

#353353

Green-sensitive cones are reduced, which often compresses green and red distinctions.

Tritanopia

#2A5251

Blue-sensitive cones are reduced, which shifts blues and yellows toward flatter blends.

Contrast checker

Accessibility contrast snapshots

Use these quick checks to understand where the color is more reliable for text, icons, and UI foregrounds.

On white

9.4:1

AAA passes for normal text.

On black

2.23:1

Fails normal and large text guidance.

Similar colors

Nearby color references

Use nearby colors when you want alternatives with a similar overall feel but a different hue or intensity.

Color libraries

Library-ready mappings

These mappings help you slot the color into CSS names, Tailwind-like scales, and semantic design tokens faster.

CSS named match

Dark Blue

Closest standard CSS name to #284B57 for developer-friendly reference and docs.

Design token

--color-cyan-dark

A token-friendly alias you can use in design systems, Tailwind maps, or CSS variables.

Tailwind-friendly scale

cyan-500

A naming pattern that fits Tailwind-style scale systems and keeps #284B57 as the core value.

HSL token

195 37% 25%

Useful when your component library or theme layer stores semantic colors in HSL channels.

Color palettes

Palette ideas related to this color

These palette routes are pulled from the curated library based on RGB similarity, so you can branch into more complete systems quickly.

cleanprofessionalcool

Dark Blue#284B57

UI Sandbox

Production-ready color values

Accessibility checks

Tonal scale

Contrast Audit

Simulator

Palette combinations from this base color

Design expert profile

Language

Copy for any framework

Share this color

Dark Blue

Nearby named colors

Closest real-world color

About Dark Blue

Color conversions

Shades and tonal variations

Harmony-based palette routes

Color blindness preview

Accessibility contrast snapshots

Nearby color references

Library-ready mappings

Palette ideas related to this color

Dark Blue
#284B57