#42333E
Closest named color: Onyx (#343A40). oklch(34.2% 0.028 335.9), rgb(66, 51, 62).
Aa
White text reads best on this color (11.83:1).
About this color
#42333E is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.031 away. White text reads best on it, at 11.83:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.77:1 |
| White text | 11.83:1 |
Values
| HEX | #42333E |
| RGB | rgb(66, 51, 62) |
| HSL | hsl(316, 13%, 23%) |
| OKLCH | oklch(34.2% 0.028 335.9) |
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 #42333E | 11.83:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #42333E | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #42333E text on white | 11.83:1 | AAA | Lc 97.1 | Preferred for body text |
| #42333E text on black | 1.77:1 | 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
#F7F5F6
oklch(97.2% 0.002 345.2)
-
Step 100
100
#EDE8EB
oklch(93.6% 0.007 340.4)
-
Step 200
200
#DED6DC
oklch(88.4% 0.012 334.1)
-
Step 300
300
#CABCC6
oklch(81% 0.021 335.8)
-
Step 400
400
#AF99A9
oklch(70.7% 0.034 335.6)
-
Step 500
500
#9B8094
oklch(63.1% 0.044 335.4)
-
Step 600
600
#85697E
oklch(55.5% 0.047 335.2)
-
Step 700
700
#71586A
oklch(49.2% 0.042 336.5)
-
Step 800
800
#5C4857
oklch(42.8% 0.036 335.2)
-
Step 900
900 (this color)
#42333E
oklch(34.2% 0.028 335.9)
-
Step 950
950
#2C232A
oklch(26.9% 0.018 333.9)
#42333E 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) | #33363E | 0.027 |
| Deuteranopia (no green cones) | #36383E | 0.025 |
| Tritanopia (no blue cones) | #443337 | 0.013 |
| Achromatopsia (no color) | #373737 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42333E
#42333E
oklch(34.2% 0.028 335.9)
- #2D3D32
#2D3D32
oklch(34.2% 0.028 154.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #42333E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.031
- Charcoal Grey #3C4142 ΔE 0.044
- Gunmetal #293241 ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.057
- Charcoal #264653 ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.071
Use #42333E 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.