#403F31
Closest named color: Charcoal Grey (#3C4142). oklch(36.4% 0.023 104.1), rgb(64, 63, 49).
Aa
White text reads best on this color (10.64:1).
About this color
#403F31 is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.027 away. White text reads best on it, at 10.64:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.97:1 |
| White text | 10.64:1 |
Values
| HEX | #403F31 |
| RGB | rgb(64, 63, 49) |
| HSL | hsl(56, 13%, 22%) |
| OKLCH | oklch(36.4% 0.023 104.1) |
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 #403F31 | 10.64:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #403F31 | 1.97:1 | Fails | Lc 9.2 | Not readable |
| #403F31 text on white | 10.64:1 | AAA | Lc 94.7 | Preferred for body text |
| #403F31 text on black | 1.97:1 | Fails | Lc -7.9 | 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
#F6F5F4
oklch(97.1% 0.002 67.8)
-
Step 100
100
#EAEAE6
oklch(93.6% 0.005 106.5)
-
Step 200
200
#DAD9D2
oklch(88.4% 0.01 100)
-
Step 300
300
#C2C1B5
oklch(80.8% 0.017 102.9)
-
Step 400
400
#A3A28E
oklch(70.7% 0.028 104.8)
-
Step 500
500
#8D8B72
oklch(63.2% 0.036 103.6)
-
Step 600
600
#77755B
oklch(55.7% 0.038 103.9)
-
Step 700
700
#64624A
oklch(49.1% 0.036 103.7)
-
Step 800
800
#51503D
oklch(42.7% 0.03 105.1)
-
Step 900
900 (this color)
#403F31
oklch(36.4% 0.023 104.1)
-
Step 950
950
#27271F
oklch(27% 0.014 107.3)
#403F31 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) | #423E30 | 0.004 |
| Deuteranopia (no green cones) | #423F31 | 0.003 |
| Tritanopia (no blue cones) | #423D3B | 0.020 |
| Achromatopsia (no color) | #3E3E3E | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F31
#403F31
oklch(36.4% 0.023 104.1)
- #3C3D4A
#3C3D4A
oklch(36.4% 0.022 281.8)
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 #403F31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.027
- Onyx #343A40 ΔE 0.040
- Dark Olive #373E02 ΔE 0.059
- Dark Slate Gray #2F4F4F ΔE 0.059
- Charcoal #264653 ΔE 0.060
- Pakistan Green #283618 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.070
- Evergreen #05472A ΔE 0.070
Use #403F31 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.