#343A40

Named color: Onyx. oklch(34.5% 0.013 248.2), rgb(52, 58, 64).

White text reads best on this color (11.50:1).

About this color

#343A40 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.013. It has too little chroma to lean warm or cool. It is the named color Onyx. White text reads best on it, at 11.50:1.

Hue family	Neutrals
Lightness	dark (35%)
Chroma	close to neutral grey (0.013)
Temperature	neutral
Nearest name	Onyx
Black text	1.82:1
White text	11.50:1

Values

HEX	#343A40
RGB	rgb(52, 58, 64)
HSL	hsl(210, 10%, 23%)
OKLCH	oklch(34.5% 0.013 248.2)

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 #343A40	11.50:1	AAA	Lc -100.2	Preferred for body text
Black text on #343A40	1.82:1	Fails	Lc 7.4	Not readable
#343A40 text on white	11.50:1	AAA	Lc 96.5	Preferred for body text
#343A40 text on black	1.82:1	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

#F5F5F6

oklch(97% 0.001 286.4)
Step 100
100

#E8EAEC

oklch(93.6% 0.003 247.9)
Step 200
200

#D6D9DD

oklch(88.4% 0.006 255.5)
Step 300
300

#BCC1C7

oklch(80.9% 0.01 252.8)
Step 400
400

#99A2AA

oklch(70.8% 0.016 244.8)
Step 500
500

#808B96

oklch(63.1% 0.021 248.2)
Step 600
600

#697580

oklch(55.6% 0.022 245.9)
Step 700
700

#58626C

oklch(49.1% 0.02 248.2)
Step 800
800

#485058

oklch(42.7% 0.017 248.2)
Step 900
900 (this color)

#343A40

oklch(34.5% 0.013 248.2)
Step 950
950

#23272A

oklch(27% 0.008 240.2)

Export this scale for Tailwind in the Tailwind colors tool

#343A40 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)	#383A40	0.007
Deuteranopia (no green cones)	#363940	0.004
Tritanopia (no blue cones)	#313B3C	0.010
Achromatopsia (no color)	#393939	0.013

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 #343A40, closest first.

Similar named colors

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

Use #343A40 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