#40372F
Closest named color: Onyx (#343A40). oklch(34.4% 0.019 63.8), rgb(64, 55, 47).
Aa
White text reads best on this color (11.63:1).
About this color
#40372F is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.032 away. White text reads best on it, at 11.63:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.80:1 |
| White text | 11.63:1 |
Values
| HEX | #40372F |
| RGB | rgb(64, 55, 47) |
| HSL | hsl(28, 15%, 22%) |
| OKLCH | oklch(34.4% 0.019 63.8) |
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 #40372F | 11.63:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #40372F | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #40372F text on white | 11.63:1 | AAA | Lc 96.8 | Preferred for body text |
| #40372F text on black | 1.80:1 | Fails | Lc 0.0 | 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
#F6F5F4
oklch(97.1% 0.002 67.8)
-
Step 100
100
#ECE9E7
oklch(93.6% 0.004 56.4)
-
Step 200
200
#DDD8D4
oklch(88.5% 0.008 61.4)
-
Step 300
300
#C7BFB8
oklch(80.9% 0.013 63.9)
-
Step 400
400
#AB9E93
oklch(70.7% 0.022 62.7)
-
Step 500
500
#968678
oklch(63% 0.028 63.5)
-
Step 600
600
#817061
oklch(55.7% 0.031 63.6)
-
Step 700
700
#6D5E50
oklch(49.2% 0.029 65.1)
-
Step 800
800
#594C42
oklch(42.7% 0.024 59.7)
-
Step 900
900 (this color)
#40372F
oklch(34.4% 0.019 63.8)
-
Step 950
950
#2B2521
oklch(27% 0.012 55.8)
#40372F 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) | #3A372E | 0.011 |
| Deuteranopia (no green cones) | #3C392F | 0.009 |
| Tritanopia (no blue cones) | #433535 | 0.015 |
| Achromatopsia (no color) | #393939 | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40372F
#40372F
oklch(34.4% 0.019 63.8)
- #313A42
#313A42
oklch(34.3% 0.019 245.2)
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 #40372F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.032
- Charcoal Grey #3C4142 ΔE 0.037
- Gunmetal #293241 ΔE 0.056
- Pakistan Green #283618 ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.065
- Space Cadet #2B2D42 ΔE 0.067
- Dark Olive #373E02 ΔE 0.068
- Charcoal #264653 ΔE 0.069
Use #40372F 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.