GREENS

Sea Monster

#658C7B

RGB 101, 140, 123 · HSL 154°, 16%, 47% · CMYK 28, 0, 12, 45

Sea Monster is #658C7B in HEX — rgb(101, 140, 123), hsl(154°, 16%, 47%), cmyk(28%, 0%, 12%, 45%).

Sea Monster pulls into the mid-tone end of the greens spectrum — HSL 154°, 16%, 47%. The neutral saturation makes it near-neutral and forgiving, and the hue reads cool. In interior projects it shines on bedrooms, bathrooms, libraries — for grounding, restorative spaces. Reads best alongside soft white walls, oak floors, brass, warm clay accents.

Color Codes

HEX#658C7B

RGB101, 140, 123

HSL154°, 16%, 47%

HSV154°, 28%, 55%

CMYK28, 0, 12, 45

Decimal6655099

CSS RGBrgb(101, 140, 123)

CSS HSLhsl(154, 16%, 47%)

Paint Matches — this color across 16 brands

Dulux

Sea Monster S26C6

ΔE 0.6 · #658C7A

Sherwin-Williams

Grandview SW6466

ΔE 2.5 · #6B927F

Behr

Dark Jade MQ6-43

ΔE 2.5 · #5C8878

PPG

Sheffield 1139-5

ΔE 2.6 · #638F7B

Vista Paint

Mountain Meadow C-702

ΔE 3.1 · #648678

Valspar

Cool Bluegrass 5005-6A

ΔE 3.2 · #6E937F

Hallman-Lindsay

Mountain Meadow 703

ΔE 3.2 · #66887B

Benjamin Moore

Palm 642

ΔE 3.7 · #598A78

Dunn-Edwards

Up North DE5711

ΔE 4.1 · #6F9587

Kilz

Bitter Arugula RG270-02

ΔE 5.6 · #6A886F

IKEA

IKEA116 116

ΔE 7.8 · #5E7A65

RAL

Mint Turquoise 6033

ΔE 8.7 · #497E76

Farrow & Ball

Calke Green 34

ΔE 10.8 · #768769

Kobra

Green 36

ΔE 11.6 · #4E795B

Colorhouse

Glass .05 Glass-05

ΔE 11.9 · #6E7E60

Dutch Boy

Smoky Gray VS-9305

ΔE 17.1 · #95958D

Light Reflectance & Undertone

Light Reflectance Value (LRV)

23/100

Dark

0 · DarkLight · 100

Soaks up light and feels moody and intimate. Great for studies, dining rooms and accent walls; pair with ample lighting.

Undertone

TemperatureCool MasstoneTeal UndertoneGreen

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

Color Theory

Complementary

#658C7B

#8B6575

Analogous

#658B67

#658C7B

#65888B

Triadic

#658C7B

#7A658B

#8B7A65

Split-Complementary

#658C7B

#8B6588

#8B6765

Tetradic

#658C7B

#67658B

#8B6575

#888B65

Monochromatic

#24322C

#455F53

#658C7B

#8FAEA0

#BBCEC6

Rectangle

#658C7B

#65758B

#8B6575

#8B7A65

Compound

#658C7B

#65888B

#8B6575

#8B6765

Variations

Lighter

#82A495

#A3B9AF

#CAD5D0

Darker

#507062

#364E43

#1F2D27

Saturation

#727E79

#658B7A

#32BD81

Interior Use

Best Rooms

bedrooms, bathrooms, libraries

Best Uses

main walls, cabinetry, soft furniture

Pairs With

soft white walls, oak floors, brass, warm clay accents

Accessibility (WCAG)

vs White

3.76:1

AA Large

vs Black

5.59:1

Deuteranopia

#658C7B

#807F7D

Original → Simulated

Protanopia

#658C7B

#86867D

Original → Simulated

Tritanopia

#658C7B

#688989

Original → Simulated

Color Psychology

Calm · Restorative

Sea Monster sits in the part of the spectrum the eye relaxes into. Designers reach for green when a room needs to feel like a refuge — bedrooms, libraries, bathrooms — because it lowers visual blood-pressure without flattening the space.

SymbolismGrowth, balance, nature

PersonalitySteady, grounded, thoughtful

calmnaturerestorativebalancebedroomlibrary

How it looks under different light

#8B9677

Warm Bulb 2700K

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

#658C7B

Daylight 5500K

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

#789B9C

Cool Bulb 6500K

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

Pairs With

#EAEBEB

Trim

Matched off-white

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

#F7F7F7

Ceiling

Whisper tint

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

#7F4C62

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

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: #658C7B;

CSS — background

background-color: #658C7B;

CSS Variable

--color-sea-monster: #658C7B;

Tailwind v3 — config

colors: { 'sea-monster': '#658C7B' }

Tailwind — arbitrary

bg-[#658C7B] text-[#658C7B]

SCSS

$sea-monster: #658C7B;

Similar Colors

Spotswood Teal

#6E9486 · ΔE 3.8

Palm Trees

#588977 · ΔE 3.9

Waterbury Green

#6C9187 · ΔE 4.8

Webster Green

#64806C · ΔE 5.8

Lehigh Green

#75957D · ΔE 5.8

Fairmont Green

#638469 · ΔE 6.8

Clearspring Green

#759A80 · ΔE 7.2

Cedar Mountains

#71887F · ΔE 7.6

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 #658C7B?

#658C7B is Sea Monster, a mid-tone green with a cool undertone.

Is #658C7B warm or cool?

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

What rooms work best with Sea Monster?

Sea Monster works well in bedrooms, bathrooms, libraries. Designers typically use it for main walls, cabinetry, soft furniture.

What colors pair well with Sea Monster?

Sea Monster pairs naturally with soft white walls, oak floors, brass, warm clay accents. Its complementary color is also a strong contrast option for accents.

Where can I download Sea Monster?

You can download Sea Monster 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 Sea Monster?

The hex code is #658C7B. In RGB it's 101, 140, 123, and in HSL it's 154°, 16%, 47%.

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