BLUES

Thunder Night

#3A5578

RGB 58, 85, 120 · HSL 214°, 35%, 35% · CMYK 52, 29, 0, 53

Thunder Night is #3A5578 in HEX — rgb(58, 85, 120), hsl(214°, 35%, 35%), cmyk(52%, 29%, 0%, 53%).

Thunder Night pulls into the rich end of the blues spectrum — HSL 214°, 35%, 35%. 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#3A5578
RGB58, 85, 120
HSL214°, 35%, 35%
HSV214°, 52%, 47%
CMYK52, 29, 0, 53
Decimal3822968
CSS RGBrgb(58, 85, 120)
CSS HSLhsl(214, 35%, 35%)

Paint Matches — this color across 16 brands

Kilz

Thunder Night RC100-01

Exact match

Dulux

Aerostatics S37E8

ΔE 2.1 · #355576

IKEA

IKEA122 122

ΔE 2.9 · #3A5170

Benjamin Moore

New 805

ΔE 3 · #365574

Valspar

Precious Sapphire 4010-7

ΔE 3 · #44597E

Dunn-Edwards

Newbury Port DE5881

ΔE 3.6 · #445A79

Behr

Champlain Blue HDC-CL-26

ΔE 3.6 · #425573

Vista Paint

Happy Tune C-647

ΔE 4.3 · #315472

PPG

Blue Tang 10-32 · 1160-7

ΔE 4.7 · #2A4B6E

Hallman-Lindsay

Happy Tune 648

ΔE 5.1 · #345875

Sherwin-Williams

Indigo SW6531

ΔE 5.5 · #284A70

RAL

Brillant Blue 5007

ΔE 6.2 · #3E5F8A

Kobra

Blue 30

ΔE 8.9 · #195584

Farrow & Ball

Pitch Blue 220

ΔE 12.2 · #636E8F

Dutch Boy

Royal Blue D-6740

ΔE 13.1 · #1D375C

Colorhouse

Wool .06 Wool-06

ΔE 15.8 · #485761

Light Reflectance & Undertone

Light Reflectance Value (LRV)

9/100

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

#3A5578
#785D3A

Analogous

#3A7478
#3A5578
#3E3A78

Triadic

#3A5578
#783A55
#55783A

Split-Complementary

#3A5578
#783E3A
#74783A

Tetradic

#3A5578
#783A74
#785D3A
#3A783E

Monochromatic

#080C11
#213145
#3A5578
#537AAC
#87A2C5

Rectangle

#3A5578
#5D3A78
#785D3A
#55783A

Compound

#3A5578
#3E3A78
#785D3A
#74783A

Variations

Lighter

#5075A5
#7E98B9
#B7C3D3

Darker

#2D4462
#1E2F44
#111B28

Saturation

#505863
#3A5578
#1D5195

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

7.63:1

AAA

Aa

vs Black

2.75:1

Fail

Deuteranopia

#3A5578
#435179

Original → Simulated

Protanopia

#3A5578
#515174

Original → Simulated

Tritanopia

#3A5578
#355B56

Original → Simulated

Color Psychology

Focused · Cooling

Thunder Night 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

#6B6C75

Warm Bulb 2700K

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

#3A5578

Daylight 5500K

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

#587199

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.

#624F35

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 / Regal Select Interior

Recommended Finishes

Eggshell (walls) · Pearl (trim) · Matte (ceiling)

Eggshell hides imperfections on main walls while keeping the color rich; pearl on trim adds subtle sheen and easier cleaning; flat matte on ceilings prevents glare.

Best Surfaces

Primary walls · Cabinetry · Doors · Mouldings

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

Standard primer is adequate.

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: #3A5578;
CSS — background 
background-color: #3A5578;
CSS Variable 
--color-thunder-night: #3A5578;
Tailwind v3 — config 
colors: { 'thunder-night': '#3A5578' }
Tailwind — arbitrary 
bg-[#3A5578] text-[#3A5578]
SCSS 
$thunder-night: #3A5578;

Similar Colors

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#355473 · ΔE 3.0

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#325A7D · ΔE 3.8

Indi Go-Go

#445772 · ΔE 5.4

Downpour Blue

#254669 · ΔE 6.7

Champion Cobalt

#264864 · ΔE 7.7

Mistral

#10557D · ΔE 7.8

Kensington Blue

#4B5A71 · ΔE 8.4

Bermuda Blue

#185D82 · ΔE 8.7
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 #3A5578?

#3A5578 is Thunder Night, a deep blue with a cool undertone.

Is #3A5578 warm or cool?

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

What rooms work best with Thunder Night?

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

What colors pair well with Thunder Night?

Thunder Night 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 Thunder Night?

You can download Thunder Night 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 Thunder Night?

The hex code is #3A5578. In RGB it's 58, 85, 120, and in HSL it's 214°, 35%, 35%.

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