BLUES

Blue Mosque

#21426B

RGB 33, 66, 107 · HSL 213°, 53%, 27% · CMYK 69, 38, 0, 58

Blue Mosque is #21426B in HEX — rgb(33, 66, 107), hsl(213°, 53%, 27%), cmyk(69%, 38%, 0%, 58%).

Blue Mosque pulls into the deep end of the blues spectrum — HSL 213°, 53%, 27%. The balanced saturation makes it confident without overpowering, 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#21426B
RGB33, 66, 107
HSL213°, 53%, 27%
HSV213°, 69%, 42%
CMYK69, 38, 0, 58
Decimal2179691
CSS RGBrgb(33, 66, 107)
CSS HSLhsl(213, 53%, 27%)

Paint Matches — this color across 16 brands

Dulux

Blue Mosque S39E9

ΔE 1.8 · #21446B

Behr

Nocturnal Sea 570D-7

ΔE 2.1 · #173F67

Vista Paint

Midnight Interlude K-1243

ΔE 4 · #30466B

Kilz

Indigo RH220

ΔE 4 · #314973

Sherwin-Williams

Indigo SW6531

ΔE 4.2 · #284A70

PPG

Dragonfly 1162-7

ΔE 4.6 · #314A76

Benjamin Moore

Downpour 2063-20

ΔE 4.7 · #26476A

Dutch Boy

Delft Blue 7447

ΔE 4.8 · #003B67

Dunn-Edwards

Slumber DE5860

ΔE 6.4 · #2D517C

Hallman-Lindsay

Newport Indigo historic-newport-indigo

ΔE 7.5 · #313D6C

RAL

Capri Blue 5019

ΔE 9 · #1B5583

Kobra

Blue 30

ΔE 9.2 · #195584

IKEA

IKEA122 122

ΔE 9.6 · #3A5170

Valspar

Classic Royal Blue 4009-8

ΔE 10 · #465380

Farrow & Ball

Stiffkey Blue 281

ΔE 20.5 · #4D5B6A

Colorhouse

Petal .05 Petal-05

ΔE 20.5 · #1F4992

Light Reflectance & Undertone

Light Reflectance Value (LRV)

5/100

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

#21426B
#694820

Analogous

#206669
#21426B
#242069

Triadic

#21426B
#692041
#416920

Split-Complementary

#21426B
#692420
#666920

Tetradic

#21426B
#692066
#694820
#206924

Monochromatic

#060C14
#0E1D2F
#21426B
#3265A4
#578CCB

Rectangle

#21426B
#482069
#694820
#416920

Compound

#21426B
#242069
#694820
#666920

Variations

Lighter

#3264A2
#5D8AC2
#A6BBD6

Darker

#183456
#10243C
#091523

Saturation

#3A4450
#204169
#10407A

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

10.21:1

AAA

Aa

vs Black

2.06:1

Fail

Deuteranopia

#21426B
#2B3F6B

Original → Simulated

Protanopia

#21426B
#3E3E67

Original → Simulated

Tritanopia

#21426B
#184A44

Original → Simulated

Color Psychology

Focused · Cooling

Blue Mosque 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

#585E6B

Warm Bulb 2700K

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

#21426B

Daylight 5500K

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

#456390

Cool Bulb 6500K

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

Pairs With

#E9EAED

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.

#553D20

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: #21426B;
CSS — background 
background-color: #21426B;
CSS Variable 
--color-blue-mosque: #21426B;
Tailwind v3 — config 
colors: { 'blue-mosque': '#21426B' }
Tailwind — arbitrary 
bg-[#21426B] text-[#21426B]
SCSS 
$blue-mosque: #21426B;

Similar Colors

Downpour Blue

#254669 · ΔE 4.5

Symphony Blue

#203B5D · ΔE 5.2

Patriot Blue

#184A7C · ΔE 6.5

Admiral Blue

#2B3762 · ΔE 7.3

Wizard

#40466D · ΔE 7.8

Bold Blue

#2B3558 · ΔE 8.0

Blueberry Hill

#335183 · ΔE 8.5

Blue Grotto

#353963 · ΔE 8.6
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 #21426B?

#21426B is Blue Mosque, a deep blue with a cool undertone.

Is #21426B warm or cool?

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

What rooms work best with Blue Mosque?

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

What colors pair well with Blue Mosque?

Blue Mosque 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 Blue Mosque?

You can download Blue Mosque 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 Blue Mosque?

The hex code is #21426B. In RGB it's 33, 66, 107, and in HSL it's 213°, 53%, 27%.

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