#403F2F
Closest named color: Charcoal Grey (#3C4142). oklch(36.4% 0.026 104.6), rgb(64, 63, 47).
Aa
White text reads best on this color (10.65:1).
About this color
#403F2F is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.026. 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 10.65:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.97:1 |
| White text | 10.65:1 |
Values
| HEX | #403F2F |
| RGB | rgb(64, 63, 47) |
| HSL | hsl(56, 15%, 22%) |
| OKLCH | oklch(36.4% 0.026 104.6) |
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 #403F2F | 10.65:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #403F2F | 1.97:1 | Fails | Lc 9.2 | Not readable |
| #403F2F text on white | 10.65:1 | AAA | Lc 94.7 | Preferred for body text |
| #403F2F 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
#F6F5F3
oklch(97% 0.003 84.6)
-
Step 100
100
#EAEAE6
oklch(93.6% 0.005 106.5)
-
Step 200
200
#DADAD1
oklch(88.6% 0.012 106.6)
-
Step 300
300
#C2C1B3
oklch(80.8% 0.019 103.5)
-
Step 400
400
#A3A28C
oklch(70.7% 0.031 105)
-
Step 500
500
#8D8B6F
oklch(63.1% 0.04 104.1)
-
Step 600
600
#777557
oklch(55.6% 0.044 104.5)
-
Step 700
700
#646247
oklch(49% 0.041 104.2)
-
Step 800
800
#52503B
oklch(42.7% 0.033 103.1)
-
Step 900
900 (this color)
#403F2F
oklch(36.4% 0.026 104.6)
-
Step 950
950
#28271E
oklch(27.1% 0.016 102.2)
#403F2F 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) | #423E2E | 0.004 |
| Deuteranopia (no green cones) | #423F30 | 0.004 |
| Tritanopia (no blue cones) | #433D3B | 0.024 |
| Achromatopsia (no color) | #3E3E3E | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F2F
#403F2F
oklch(36.4% 0.026 104.6)
- #3C3C4C
#3C3C4C
oklch(36.3% 0.027 285)
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 #403F2F, 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 0.042
- Dark Olive #373E02 ΔE 0.056
- Pakistan Green #283618 ΔE 0.061
- Dark Slate Gray #2F4F4F ΔE 0.061
- Charcoal #264653 ΔE 0.063
- Evergreen #05472A ΔE 0.068
- Dark Blue Grey #1F3B4D ΔE 0.072
Use #403F2F 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.