BLUES

Harpoon

#283B4C

RGB 40, 59, 76 · HSL 208°, 31%, 23% · CMYK 47, 22, 0, 70

Harpoon is #283B4C in HEX — rgb(40, 59, 76), hsl(208°, 31%, 23%), cmyk(47%, 22%, 0%, 70%).

Harpoon pulls into the deep end of the blues spectrum — HSL 208°, 31%, 23%. 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#283B4C
RGB40, 59, 76
HSL208°, 31%, 23%
HSV208°, 47%, 30%
CMYK47, 22, 0, 70
Decimal2636620
CSS RGBrgb(40, 59, 76)
CSS HSLhsl(208, 31%, 23%)

Paint Matches — this color across 16 brands

Dulux

Harpoon S36C9

ΔE 1.1 · #273C4C

Benjamin Moore

North CC-932

ΔE 1.2 · #2C3C4D

Sherwin-Williams

In the Navy SW9178

ΔE 1.5 · #283849

Behr

Sorcerer 760F-7

ΔE 3.4 · #2B3645

Vista Paint

Blazer Blue K-152

ΔE 4.7 · #243A52

Dunn-Edwards

Old Mill DEA185

ΔE 4.7 · #343B4E

RAL

Ocean Blue 5020

ΔE 5.6 · #1D334A

Hallman-Lindsay

Star-studded 620

ΔE 5.9 · #32425A

Kobra

Blue 31

ΔE 6.5 · #334059

PPG

Sailor's Coat 1153-7

ΔE 7.5 · #334B58

Valspar

Blue Coal 4011-3

ΔE 8.2 · #414450

Kilz

Blue Galaxy RB100-02

ΔE 9.3 · #41445C

Farrow & Ball

Hague Blue 30

ΔE 9.9 · #3D4E57

IKEA

IKEA163 163

ΔE 11.1 · #423A45

Colorhouse

Nourish .06 Nourish-06

ΔE 11.8 · #313536

Dutch Boy

Royal Blue D-6740

ΔE 13.7 · #1D375C

Light Reflectance & Undertone

Light Reflectance Value (LRV)

4/100

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

#283B4C
#4D3928

Analogous

#284D4C
#283B4C
#282A4D

Triadic

#283B4C
#4D283C
#3C4D28

Split-Complementary

#283B4C
#4D282A
#4D4C28

Tetradic

#283B4C
#4C284D
#4D3928
#2A4D28

Monochromatic

#090D11
#0E151B
#283B4C
#43637F
#628AAC

Rectangle

#283B4C
#39284D
#4D3928
#3C4D28

Compound

#283B4C
#282A4D
#4D3928
#4D4C28

Variations

Lighter

#446480
#6A8BA8
#ABBBC9

Darker

#20303E
#15212B
#0C1319

Saturation

#353B40
#283C4D
#143D61

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)

Aa

vs White

11.54:1

AAA

Aa

vs Black

1.82:1

Fail

Deuteranopia

#283B4C
#30374C

Original → Simulated

Protanopia

#283B4C
#38384A

Original → Simulated

Tritanopia

#283B4C
#263E3B

Original → Simulated

Color Psychology

Focused · Cooling

Harpoon 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

#5D5954

Warm Bulb 2700K

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

#283B4C

Daylight 5500K

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

#4B5E78

Cool Bulb 6500K

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

Pairs With

#E9EBEC

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.

#3F3125

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

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: #283B4C;
CSS — background 
background-color: #283B4C;
CSS Variable 
--color-harpoon: #283B4C;
Tailwind v3 — config 
colors: { 'harpoon': '#283B4C' }
Tailwind — arbitrary 
bg-[#283B4C] text-[#283B4C]
SCSS 
$harpoon: #283B4C;

Similar Colors

North Sea

#2B3B4C · ΔE 1.0

Deep Royal

#2F394B · ΔE 3.3

Washington Blue

#304656 · ΔE 4.8

Twilight

#254455 · ΔE 5.0

Old Navy

#2E3549 · ΔE 5.3

Polo Blue

#323A43 · ΔE 6.2

Marine Blue

#1D3E59 · ΔE 7.1

Blackberry Punch

#3F4150 · ΔE 7.4
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 #283B4C?

#283B4C is Harpoon, a deep blue with a cool undertone.

Is #283B4C warm or cool?

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

What rooms work best with Harpoon?

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

What colors pair well with Harpoon?

Harpoon 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 Harpoon?

You can download Harpoon 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 Harpoon?

The hex code is #283B4C. In RGB it's 40, 59, 76, and in HSL it's 208°, 31%, 23%.

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