#403638

Closest named color: Onyx (#343A40). oklch(34.4% 0.015 4.3), rgb(64, 54, 56).

White text reads best on this color (11.64:1).

About this color

#403638 is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.024 away. White text reads best on it, at 11.64:1.

Hue family	Neutrals
Lightness	dark (34%)
Chroma	close to neutral grey (0.015)
Temperature	neutral
Nearest name	Onyx (#343A40)
Black text	1.80:1
White text	11.64:1

Values

HEX	#403638
RGB	rgb(64, 54, 56)
HSL	hsl(348, 8%, 23%)
OKLCH	oklch(34.4% 0.015 4.3)

Contrast

WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.

Pair	WCAG 2	Result	APCA	APCA guidance
White text on #403638	11.64:1	AAA	Lc -100.4	Preferred for body text
Black text on #403638	1.80:1	Fails	Lc 0.0	Not readable
#403638 text on white	11.64:1	AAA	Lc 96.8	Preferred for body text
#403638 text on black	1.80:1	Fails	Lc 0.0	Not readable

Tints and shades

A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.

Step 50
50

#F6F5F5

oklch(97.1% 0.001 17.2)
Step 100
100

#ECE9E9

oklch(93.6% 0.003 17.2)
Step 200
200

#DDD7D8

oklch(88.4% 0.007 5.6)
Step 300
300

#C7BEC0

oklch(80.9% 0.01 2.1)
Step 400
400

#AB9C9F

oklch(70.7% 0.018 3.9)
Step 500
500

#968488

oklch(63.1% 0.023 2.7)
Step 600
600

#806E71

oklch(55.6% 0.023 6.5)
Step 700
700

#6D5C5F

oklch(49.2% 0.023 6)
Step 800
800

#584B4E

oklch(42.7% 0.018 2.3)
Step 900
900 (this color)

#403638

oklch(34.4% 0.015 4.3)
Step 950
950

#2B2526

oklch(27.2% 0.009 6.3)

Export this scale for Tailwind in the Tailwind colors tool

#403638 with color blindness

Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.

Vision	Seen as	Shift (ΔE)
Protanopia (no red cones)	#373738	0.016
Deuteranopia (no green cones)	#393938	0.015
Tritanopia (no blue cones)	#423537	0.004
Achromatopsia (no color)	#383838	0.015

Harmonies

Hue rotations in OKLCH that keep this color's lightness and chroma.

This color is close to neutral, so it has no meaningful hue to rotate. Hue harmonies are omitted.

Palettes with this color

Curated palettes that contain a color within ΔE 0.04 (OKLab) of #403638, closest first.

Similar named colors

The eight closest entries in our named color list, with their ΔE distance.

Use #403638 in your product

Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.

Build a color system from this color Generate a palette