#40372C
Closest named color: Onyx (#343A40). oklch(34.3% 0.022 72.5), rgb(64, 55, 44).
Aa
White text reads best on this color (11.66:1).
About this color
#40372C is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.036 away. White text reads best on it, at 11.66:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.80:1 |
| White text | 11.66:1 |
Values
| HEX | #40372C |
| RGB | rgb(64, 55, 44) |
| HSL | hsl(33, 19%, 21%) |
| OKLCH | oklch(34.3% 0.022 72.5) |
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 #40372C | 11.66:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #40372C | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #40372C text on white | 11.66:1 | AAA | Lc 96.8 | Preferred for body text |
| #40372C 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
#ECE9E6
oklch(93.6% 0.005 67.8)
-
Step 200
200
#DDD8D3
oklch(88.5% 0.009 67.7)
-
Step 300
300
#C7BFB5
oklch(80.8% 0.017 73.6)
-
Step 400
400
#AB9E8F
oklch(70.6% 0.026 71.3)
-
Step 500
500
#978773
oklch(63.2% 0.035 73.3)
-
Step 600
600
#81705B
oklch(55.5% 0.038 72.8)
-
Step 700
700
#6D5E4B
oklch(49.1% 0.035 73.4)
-
Step 800
800
#594D3E
oklch(42.8% 0.029 73.1)
-
Step 900
900 (this color)
#40372C
oklch(34.3% 0.022 72.5)
-
Step 950
950
#2B251F
oklch(26.9% 0.014 67.2)
#40372C 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) | #3A372B | 0.011 |
| Deuteranopia (no green cones) | #3D392C | 0.008 |
| Tritanopia (no blue cones) | #433534 | 0.018 |
| Achromatopsia (no color) | #383838 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40372C
#40372C
oklch(34.3% 0.022 72.5)
- #303A44
#303A44
oklch(34.3% 0.022 248.5)
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 #40372C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.040
- Pakistan Green #283618 ΔE 0.055
- Gunmetal #293241 ΔE 0.059
- Dark Olive #373E02 ΔE 0.064
- Dark Blue Grey #1F3B4D ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.070
- Charcoal #264653 ΔE 0.072
Use #40372C 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.