#42383C
Closest named color: Onyx (#343A40). oklch(35.3% 0.016 351.8), rgb(66, 56, 60).
Aa
White text reads best on this color (11.27:1).
About this color
#42383C is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.016. 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 11.27:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.86:1 |
| White text | 11.27:1 |
Values
| HEX | #42383C |
| RGB | rgb(66, 56, 60) |
| HSL | hsl(336, 8%, 24%) |
| OKLCH | oklch(35.3% 0.016 351.8) |
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 #42383C | 11.27:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #42383C | 1.86:1 | Fails | Lc 7.8 | Not readable |
| #42383C text on white | 11.27:1 | AAA | Lc 96.0 | Preferred for body text |
| #42383C text on black | 1.86:1 | 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
#ECE9EA
oklch(93.7% 0.003 354.7)
-
Step 200
200
#DDD7D9
oklch(88.4% 0.007 354.8)
-
Step 300
300
#C7BEC1
oklch(81% 0.011 355)
-
Step 400
400
#AA9CA2
oklch(70.7% 0.018 349.7)
-
Step 500
500
#96848B
oklch(63.2% 0.024 352.3)
-
Step 600
600
#806D75
oklch(55.5% 0.027 350.7)
-
Step 700
700
#6C5B62
oklch(49% 0.024 351.3)
-
Step 800
800
#584B50
oklch(42.8% 0.019 352.8)
-
Step 900
900 (this color)
#42383C
oklch(35.3% 0.016 351.8)
-
Step 950
950
#2A2527
oklch(27.1% 0.008 351.5)
#42383C 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) | #393A3C | 0.016 |
| Deuteranopia (no green cones) | #3B3B3C | 0.015 |
| Tritanopia (no blue cones) | #443839 | 0.006 |
| Achromatopsia (no color) | #3B3B3B | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42383C
#42383C
oklch(35.3% 0.016 351.8)
- #333E3A
#333E3A
oklch(35.2% 0.016 171.4)
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 #42383C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.024
- Charcoal Grey #3C4142 ΔE 0.028
- Gunmetal #293241 ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.056
- Charcoal #264653 ΔE 0.059
- Space Cadet #2B2D42 ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.064
- Purple Brown #673A3F ΔE 0.072
Use #42383C 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.