#423D4E
Closest named color: Charcoal Grey (#3C4142). oklch(37.2% 0.029 298.4), rgb(66, 61, 78).
Aa
White text reads best on this color (10.45:1).
About this color
#423D4E is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.030 away. White text reads best on it, at 10.45:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #423D4E |
| RGB | rgb(66, 61, 78) |
| HSL | hsl(258, 12%, 27%) |
| OKLCH | oklch(37.2% 0.029 298.4) |
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 #423D4E | 10.45:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #423D4E | 2.00:1 | Fails | Lc 9.6 | Not readable |
| #423D4E text on white | 10.45:1 | AAA | Lc 94.3 | Preferred for body text |
| #423D4E text on black | 2.00:1 | Fails | Lc -8.3 | 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
#F6F5F7
oklch(97.1% 0.003 308.4)
-
Step 100
100
#EAE9EE
oklch(93.6% 0.007 295.4)
-
Step 200
200
#DAD7E0
oklch(88.4% 0.013 301.3)
-
Step 300
300
#C2BECD
oklch(80.9% 0.021 298.1)
-
Step 400
400
#A39CB4
oklch(70.7% 0.035 298.8)
-
Step 500
500
#8D84A2
oklch(63.2% 0.046 298.8)
-
Step 600
600
#776D8D
oklch(55.6% 0.05 299.1)
-
Step 700
700
#645B78
oklch(49.1% 0.047 298.9)
-
Step 800
800
#514B61
oklch(42.7% 0.037 297.3)
-
Step 900
900 (this color)
#423D4E
oklch(37.2% 0.029 298.4)
-
Step 950
950
#27252E
oklch(27% 0.017 295.4)
#423D4E 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) | #3A404F | 0.015 |
| Deuteranopia (no green cones) | #3A3F4D | 0.015 |
| Tritanopia (no blue cones) | #403F43 | 0.023 |
| Achromatopsia (no color) | #3F3F3F | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423D4E
#423D4E
oklch(37.2% 0.029 298.4)
- #3E4331
#3E4331
oklch(37.3% 0.03 120.5)
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 #423D4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.030
- Onyx #343A40 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.043
- Charcoal #264653 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.053
- Gunmetal #293241 ΔE 0.060
- Dark Slate Gray #2F4F4F ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.066
Use #423D4E 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.