#42423B
Closest named color: Charcoal Grey (#3C4142). oklch(37.7% 0.012 106.9), rgb(66, 66, 59).
Aa
White text reads best on this color (10.12:1).
About this color
#42423B is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.012. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.016 away. White text reads best on it, at 10.12:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.012) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.07:1 |
| White text | 10.12:1 |
Values
| HEX | #42423B |
| RGB | rgb(66, 66, 59) |
| HSL | hsl(60, 6%, 25%) |
| OKLCH | oklch(37.7% 0.012 106.9) |
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 #42423B | 10.12:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #42423B | 2.07:1 | Fails | Lc 10.4 | Not readable |
| #42423B text on white | 10.12:1 | AAA | Lc 93.5 | Preferred for body text |
| #42423B text on black | 2.07:1 | Fails | Lc -9.0 | 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
#F5F5F4
oklch(97% 0.001 106.4)
-
Step 100
100
#EAEAE8
oklch(93.6% 0.003 106.5)
-
Step 200
200
#D9D9D6
oklch(88.4% 0.004 106.5)
-
Step 300
300
#C1C1BB
oklch(80.9% 0.008 106.6)
-
Step 400
400
#A1A197
oklch(70.6% 0.014 106.8)
-
Step 500
500
#8A8A7E
oklch(63% 0.018 106.9)
-
Step 600
600
#747467
oklch(55.5% 0.02 107)
-
Step 700
700
#626256
oklch(49.2% 0.019 107.1)
-
Step 800
800
#505046
oklch(42.8% 0.016 107.1)
-
Step 900
900 (this color)
#42423B
oklch(37.7% 0.012 106.9)
-
Step 950
950
#272723
oklch(27.1% 0.007 106.9)
#42423B 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) | #43413B | 0.004 |
| Deuteranopia (no green cones) | #43423B | 0.002 |
| Tritanopia (no blue cones) | #434140 | 0.010 |
| Achromatopsia (no color) | #424242 | 0.012 |
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 #42423B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.016
- Onyx #343A40 ΔE 0.039
- Dark Slate Gray #2F4F4F ΔE 0.047
- Charcoal #264653 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.059
- Dark Teal #014D4E ΔE 0.066
- Dark Blue Grey #1F3B4D ΔE 0.067
- Dark Blue Green #005249 ΔE 0.070
Use #42423B 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.