#423F4A
Closest named color: Charcoal Grey (#3C4142). oklch(37.5% 0.019 298), rgb(66, 63, 74).
Aa
White text reads best on this color (10.28:1).
About this color
#423F4A is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.020 away. White text reads best on it, at 10.28:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.04:1 |
| White text | 10.28:1 |
Values
| HEX | #423F4A |
| RGB | rgb(66, 63, 74) |
| HSL | hsl(256, 8%, 27%) |
| OKLCH | oklch(37.5% 0.019 298) |
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 #423F4A | 10.28:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #423F4A | 2.04:1 | Fails | Lc 10.0 | Not readable |
| #423F4A text on white | 10.28:1 | AAA | Lc 93.9 | Preferred for body text |
| #423F4A text on black | 2.04:1 | Fails | Lc -8.6 | 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
#EAE9EC
oklch(93.6% 0.004 301.4)
-
Step 200
200
#D9D8DE
oklch(88.5% 0.008 293.9)
-
Step 300
300
#C1BFC9
oklch(80.9% 0.014 295.3)
-
Step 400
400
#A29EAD
oklch(70.7% 0.022 298)
-
Step 500
500
#8B8699
oklch(63.1% 0.029 297.6)
-
Step 600
600
#757084
oklch(55.7% 0.031 296.8)
-
Step 700
700
#625D70
oklch(49% 0.031 297.3)
-
Step 800
800
#504C5B
oklch(42.6% 0.025 297.5)
-
Step 900
900 (this color)
#423F4A
oklch(37.5% 0.019 298)
-
Step 950
950
#27252C
oklch(27% 0.013 298.6)
#423F4A 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) | #3D414B | 0.010 |
| Deuteranopia (no green cones) | #3D404A | 0.009 |
| Tritanopia (no blue cones) | #414143 | 0.016 |
| Achromatopsia (no color) | #414141 | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F4A
#423F4A
oklch(37.5% 0.019 298)
- #404337
#404337
oklch(37.6% 0.02 118.8)
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 #423F4A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.020
- Onyx #343A40 ΔE 0.033
- Charcoal #264653 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.043
- Dark Slate Gray #2F4F4F ΔE 0.054
- Dark Blue Grey #1F3B4D ΔE 0.054
- Gunmetal #293241 ΔE 0.062
- Purple Brown #673A3F ΔE 0.069
Use #423F4A 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.