BLUES
Dark Cobalt Blue
#33578A
Dark Cobalt Blue is #33578A in HEX — rgb(51, 87, 138), hsl(215°, 46%, 37%), cmyk(63%, 37%, 0%, 46%).
Dark Cobalt Blue pulls into the rich end of the blues spectrum — HSL 215°, 46%, 37%. 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
Paint Matches — this color across 16 brands
Behr
Dark Cobalt Blue PPU15-3
Benjamin Moore
Blue 798
Kilz
Navy Dress RH210
Dulux
Assassin S39F8
Sherwin-Williams
Frank Blue SW6967
PPG
Brilliant Blue 1161-7
Dunn-Edwards
Slumber DE5860
Valspar
Deep Space 4008-8C
Kobra
Blue 30
RAL
Capri Blue 5019
Vista Paint
Wavy Navy K-1245
Hallman-Lindsay
Glacier Bay historic-glacier-bay
IKEA
IKEA128 128
Dutch Boy
Delft Blue 7447
Colorhouse
Petal .05 Petal-05
Farrow & Ball
Pitch Blue 220
Light Reflectance & Undertone
Light Reflectance Value (LRV)
9/100
Very Dark
Absorbs almost all light — dramatic and cocooning. Needs strong artificial lighting and works best as an accent or in well-lit rooms.
Undertone
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
Analogous
Triadic
Split-Complementary
Tetradic
Monochromatic
Rectangle
Compound
Variations
Lighter
Darker
Saturation
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)
Deuteranopia
Protanopia
Tritanopia
Color Psychology
Focused · Cooling
Dark Cobalt Blue 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.
How it looks under different light
Pairs With
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
color: #33578A;background-color: #33578A;--color-dark-cobalt-blue: #33578A;colors: { 'dark-cobalt-blue': '#33578A' }bg-[#33578A] text-[#33578A]$dark-cobalt-blue: #33578A;Similar Colors
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 #33578A?
#33578A is Dark Cobalt Blue, a deep blue with a cool undertone.
Is #33578A warm or cool?
Dark Cobalt Blue reads cool, which influences how it interacts with surrounding tones and natural light.
What rooms work best with Dark Cobalt Blue?
Dark Cobalt Blue works well in bedrooms, bathrooms, home offices. Designers typically use it for main walls, ceilings, trim, cabinetry.
What colors pair well with Dark Cobalt Blue?
Dark Cobalt Blue 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 Cobalt Blue?
You can download Dark Cobalt Blue 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 Cobalt Blue?
The hex code is #33578A. In RGB it's 51, 87, 138, and in HSL it's 215°, 46%, 37%.
