BLUES

Dark Knight

#151931

RGB 21, 25, 49 · HSL 231°, 40%, 14% · CMYK 57, 49, 0, 81

Dark Knight is #151931 in HEX — rgb(21, 25, 49), hsl(231°, 40%, 14%), cmyk(57%, 49%, 0%, 81%).

Dark Knight pulls into the deep end of the blues spectrum — HSL 231°, 40%, 14%. The muted saturation makes it quiet but present, and the hue reads cool. In interior projects it shines on bedrooms, bathrooms, home offices — for calm, focused environments. Reads best alongside warm white trim, oak or walnut, brass or matte black hardware.

Color Codes

HEX#151931

RGB21, 25, 49

HSL231°, 40%, 14%

HSV231°, 57%, 19%

CMYK57, 49, 0, 81

Decimal1382705

CSS RGBrgb(21, 25, 49)

CSS HSLhsl(231, 40%, 14%)

Paint Matches — this color across 16 brands

RAL

Saphire Blue 5003

ΔE 3.7 · #1D1E33

Dulux

Deep Universe S43C9

ΔE 10.5 · #2F2B3E

Kilz

Ruling Royalty TB-50

ΔE 11.5 · #313048

Benjamin Moore

Old 2063-10

ΔE 14.1 · #2F364A

Behr

Dark Burgundy Wine BXC-09

ΔE 14.3 · #353343

Sherwin-Williams

Anchors Aweigh SW9179

ΔE 15.3 · #2B3441

Vista Paint

Blazer Blue K-152

ΔE 15.8 · #243A52

Dutch Boy

Royal Blue D-6740

ΔE 16.1 · #1D375C

Dunn-Edwards

Old Mill DEA185

ΔE 16.4 · #343B4E

Kobra

Blue 31

ΔE 17.9 · #334059

PPG

Victory Blue 1165-7

ΔE 18.1 · #3A405A

Hallman-Lindsay

Silent Sea 515

ΔE 18.8 · #2A2B2C

Valspar

Twilight Purple 4010-2

ΔE 19.1 · #3E3B46

IKEA

IKEA163 163

ΔE 19.5 · #423A45

Colorhouse

Nourish .06 Nourish-06

ΔE 21.1 · #313536

Farrow & Ball

Pitch Black 256

ΔE 23.5 · #3B3938

Light Reflectance & Undertone

Light Reflectance Value (LRV)

1/100

Very Dark

0 · DarkLight · 100

Absorbs almost all light — dramatic and cocooning. Needs strong artificial lighting and works best as an accent or in well-lit rooms.

Undertone

TemperatureCool MasstoneBlue UndertoneViolet

Reads as a cool blue with a violet undertone showing through, especially in daylight. Pair trim and adjacent colours to either calm or amplify that undertone.

Color Theory

Complementary

#151931

#322E15

Analogous

#152832

#151931

#1F1532

Triadic

#151931

#32151A

#1A3215

Split-Complementary

#151931

#321F15

#283215

Tetradic

#151931

#321528

#322E15

#15321F

Monochromatic

#080912

#151931

#2C3568

#43519D

Rectangle

#151931

#2E1532

#322E15

#1A3215

Compound

#151931

#1F1532

#322E15

#283215

Variations

Lighter

#30396F

#515EA5

#9DA3C8

Darker

#111429

#0B0E1C

#060811

Saturation

#1F2128

#151A32

#0B123D

Interior Use

Best Rooms

bedrooms, bathrooms, home offices

Best Uses

main walls, ceilings, trim, cabinetry

Pairs With

warm white trim, oak or walnut, brass or matte black hardware

Accessibility (WCAG)

vs White

17.28:1

AAA

vs Black

1.22:1

Fail

Deuteranopia

#151931

#111B31

Original → Simulated

Protanopia

#151931

#18182F

Original → Simulated

Tritanopia

#151931

#121E1B

Original → Simulated

Color Psychology

Focused · Cooling

Dark Knight lowers the temperature of a room — useful in south-facing rooms that overheat visually, and in home offices where you want a clear head. Pair with warm wood and brass to keep it from reading clinical.

SymbolismTrust, depth, stability

PersonalityClear-headed, dependable, contemplative

focustrustcalmofficebedroomdepth

How it looks under different light

#4F3F40

Warm Bulb 2700K

Incandescent / soft white LED — pulls colour toward yellow/amber.

#151931

Daylight 5500K

Midday natural light or daylight-spec LED — closest to the paint chip.

#3C4464

Cool Bulb 6500K

Cool white LED / overcast daylight — pulls colour toward blue.

Pairs With

#E9EAEC

Trim

Matched off-white

Same hue at 92% lightness — trim reads coordinated, not stark.

#F7F7F8

Ceiling

Whisper tint

Near-white with a hint of the hero's undertone — ceiling feels intentional.

#3E391E

Accent

Complementary punch

Hue +180°, slightly muted for paint vs. screen — use on a door, frame, or single piece.

#574738

Floor

Walnut neutral

Warm mid-brown grounds the scheme regardless of hero hue.

Paint Info

Brand · Product Line

Benjamin Moore / Aura Interior (for richer color depth in deep tones)

Recommended Finishes

Matte (walls) · Pearl (trim) · Satin (doors)

Deep colors look best in matte — gloss exaggerates surface flaws. Reserve subtle sheen for trim, doors, and high-touch areas.

Best Surfaces

Accent walls · Doors · Cabinetry · Built-ins

Coverage & Dry Time

Typical coverage 350-400 sq ft per gallon over a primed surface.

Touch-dry in ~1 hour. Recoat after 4 hours. Full cure 7-14 days.

Primer

Tinted primer in a similar value is highly recommended — saves a coat and prevents the wall colour from washing the surface.

Application Tip

Use a 9" microfiber roller on walls and a 2.5" angled sash brush for trim cuts. Two coats minimum for even depth.

Paint Calculator

Wall area (m²)

Coats

Coverage (m² / L)

You'll need

4.0 litres

1.06 US gallons · room for one touch-up coat. Buy slightly more to ensure single-batch match.

Code Snippets

CSS — color

color: #151931;

CSS — background

background-color: #151931;

CSS Variable

--color-dark-knight: #151931;

Tailwind v3 — config

colors: { 'dark-knight': '#151931' }

Tailwind — arbitrary

bg-[#151931] text-[#151931]

SCSS

$dark-knight: #151931;

Similar Colors

Old Navy

#2E3549 · ΔE 13.6

Majestic Violet

#3A3450 · ΔE 14.3

Midnight Navy

#333356 · ΔE 14.4

Bold Blue

#2B3558 · ΔE 14.5

Deep Royal

#2F394B · ΔE 15.8

Exotic Purple

#43334D · ΔE 16.1

Symphony Blue

#203B5D · ΔE 16.9

North Sea

#2B3B4C · ΔE 17.0

Built by DSGN.HOUSE Updated 2026

Our color tools run on our own catalogue of 26,000+ real paint colors across 16 brands — Benjamin Moore, Sherwin-Williams, Behr, Dulux, RAL and more — with the color math (HSL and CIELAB matching) computed in-house, not scraped from summaries. Every color you pick maps to a real, buyable paint with its code, so what you see here you can actually take to the store. We review and update these tools and their data regularly.

Created by Denis Kataev, founder of DSGN.HOUSE — a software engineer and digital entrepreneur building professional color-design tools for everyone.

Frequently Asked Questions

What color is #151931?

#151931 is Dark Knight, a near-black blue with a cool undertone.

Is #151931 warm or cool?

Dark Knight reads cool, which influences how it interacts with surrounding tones and natural light.

What rooms work best with Dark Knight?

Dark Knight works well in bedrooms, bathrooms, home offices. Designers typically use it for main walls, ceilings, trim, cabinetry.

What colors pair well with Dark Knight?

Dark Knight pairs naturally with warm white trim, oak or walnut, brass or matte black hardware. Its complementary color is also a strong contrast option for accents.

Where can I download Dark Knight?

You can download Dark Knight on DSGN.HOUSE in 15 designer formats including CSS gradient, Figma, Procreate swatches, Tailwind config, Adobe ASE, SVG, and 4K wallpapers — all free.

What's the hex code for Dark Knight?

The hex code is #151931. In RGB it's 21, 25, 49, and in HSL it's 231°, 40%, 14%.

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