Color detail

Deep Blue
#121F3A

Deep Blue (#121F3A) with RGB(18, 31, 58) and HSL(220, 53%, 15%). Suitable for modern interface themes, branding accents, and design systems.

BlueDeepcool

Generate harmony

Interactive

UI Sandbox

Project Dashboard

Active theme: Deep Blue

Values

Production-ready color values

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

HEX

#121F3A

RGB

rgb(18, 31, 58)

HSL

hsl(220, 53%, 15%)

HSV

hsv(220, 69%, 23%)

CMYK

cmyk(69%, 47%, 0%, 77%)

Decimal

1187642

Contrast

Accessibility checks

On white

16.37:1

On black

1.28:1

Shades

Tonal scale

#0A111F #121F3B #1E3462 #2A4989 #365EB0 #4F78C9 #7696D5 #96AEDF #B9C9E9 #DCE4F4

90080070060050040030020010050

Accessibility

Contrast Audit

On White

WCAG AA PASS

Text

16.37:1

On Black

FAIL

Text

1.28:1

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

#121F3A #3B2D12

Triadic

Open palette

#121F3B #3B121F #1F3B12

Analogous

Open palette

#12343B #122A3B #121F3B #12153B #19123B

Split complementary

Open palette

#121F3B #3B1912 #343B12

Tetradic

Open palette

#121F3B #3B1234 #3B2D12 #123B19

Monochromatic

Open palette

#182A4E #2A4989 #3C69C3 #7696D5 #B1C3E7

Analysis

Design expert profile

Detailed psychological and professional strategy for this specific tone.

Deep Blue (#121F3A) with RGB(18, 31, 58) and HSL(220, 53%, 15%). Suitable for modern interface themes, branding accents, and design systems.

bluedeepcoolhex-121f3ah-220s-53l-15

Region

Language

English Español

Developer Handoff

Copy for any framework

CSS

/* Deep Blue */
color: #121F3A;
background-color: #121F3A;
border-color: #121F3A;
box-shadow: 0 4px 24px #121f3a40;

Tailwind CSS

bg-[#121F3A] text-[#121F3A] border-[#121F3A] ring-[#121F3A]

SwiftUI

Color(red: 0.071, green: 0.122, blue: 0.227)

Flutter / Dart

Color(0xFF121F3A)

Android XML

<color name="deep_blue">#121F3A</color>

React Native

{ color: '#121F3A' }

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

Sherwin-Williams

Tricorn Black

SW 6258 · #2B2B2D

View this color →

About

About Deep Blue

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

Meaning

Deep Blue sits in the blue family with a deep tone, so it grounds darker surfaces. It reads as calm, credible, and interface-friendly.

Applications

Deep Blue (#121F3A) with RGB(18, 31, 58) and HSL(220, 53%, 15%). Suitable for modern interface themes, branding accents, and design systems. It performs better as text or iconography on lighter contexts when paired carefully.

Family

Blue

Tone

Deep

Temperature

cool

Keywords

blue, deep, cool, hex-121f3a, h-220, s-53

Conversion

Color conversions

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

HEX

#121F3A

RGB

rgb(18, 31, 58)

HSL

hsl(220, 53%, 15%)

HSV

hsv(220, 69%, 23%)

CMYK

cmyk(69%, 47%, 0%, 77%)

Variations

Shades and tonal variations

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

#0A111F #121F3B #1E3462 #2A4989 #365EB0 #4F78C9 #7696D5 #96AEDF #B9C9E9 #DCE4F4

900

#0A111F

800

#121F3B

700

#1E3462

600

#2A4989

500

#365EB0

400

#4F78C9

Color harmonies

Harmony-based palette routes

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

Complementary

Open palette

#121F3A #3B2D12

Triadic

Open palette

#121F3B #3B121F #1F3B12

Analogous

Open palette

#12343B #122A3B #121F3B #12153B #19123B

Split complementary

Open palette

#121F3B #3B1912 #343B12

Tetradic

Open palette

#121F3B #3B1234 #3B2D12 #123B19

Monochromatic

Open palette

#182A4E #2A4989 #3C69C3 #7696D5 #B1C3E7

Blindness simulator

Color blindness preview

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

Protanopia

#181833

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

Deuteranopia

#171632

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

Tritanopia

#132E2D

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

16.37:1

AAA passes for normal text.

On black

1.28:1

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

Deep Blue

Closest standard CSS name to #121F3A for developer-friendly reference and docs.

Design token

--color-blue-deep

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

Tailwind-friendly scale

blue-500

A naming pattern that fits Tailwind-style scale systems and keeps #121F3A as the core value.

HSL token

220 53% 15%

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.

Deep Blue#121F3A

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

Deep Blue

Nearby named colors

Closest real-world color

About Deep 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

Deep Blue
#121F3A