#40370B
Closest named color: Dark Olive (#373E02). oklch(33.7% 0.061 97.2), rgb(64, 55, 11).
Aa
White text reads best on this color (11.86:1).
About this color
#40370B is a dark, muted brown. In OKLCH its lightness is 34%, its chroma 0.061 and its hue 97°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Olive (#373E02), ΔE 0.030 away. White text reads best on it, at 11.86:1.
| Hue family | Browns |
| Lightness | dark (34%) |
| Chroma | muted (0.061) |
| Temperature | warm |
| Nearest name | Dark Olive (#373E02) |
| Black text | 1.76:1 |
| White text | 11.86:1 |
Values
| HEX | #40370B |
| RGB | rgb(64, 55, 11) |
| HSL | hsl(50, 71%, 15%) |
| OKLCH | oklch(33.7% 0.061 97.2) |
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 #40370B | 11.86:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #40370B | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #40370B text on white | 11.86:1 | AAA | Lc 97.1 | Preferred for body text |
| #40370B text on black | 1.76:1 | 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
#F6F5F1
oklch(97% 0.005 95.1)
-
Step 100
100
#ECEAE0
oklch(93.6% 0.013 97.4)
-
Step 200
200
#DDDAC7
oklch(88.6% 0.026 99.6)
-
Step 300
300
#C8C1A0
oklch(80.8% 0.045 97.4)
-
Step 400
400
#ADA16B
oklch(70.6% 0.074 97.2)
-
Step 500
500
#998A42
oklch(63.2% 0.094 97.7)
-
Step 600
600
#84731F
oklch(55.6% 0.102 97.3)
-
Step 700
700
#706010
oklch(49% 0.095 96.8)
-
Step 800
800
#5B4F12
oklch(42.8% 0.079 97.6)
-
Step 900
900 (this color)
#40370B
oklch(33.7% 0.061 97.2)
-
Step 950
950
#2C260F
oklch(26.9% 0.038 95)
#40370B 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) | #3D3505 | 0.010 |
| Deuteranopia (no green cones) | #40380E | 0.003 |
| Tritanopia (no blue cones) | #46322E | 0.056 |
| Achromatopsia (no color) | #373737 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40370B
#40370B
oklch(33.7% 0.061 97.2)
- #2F3456
#2F3456
oklch(33.7% 0.06 276.3)
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 #40370B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Olive #373E02 ΔE 0.030
- Pakistan Green #283618 ΔE 0.041
- Forrest Green #154406 ΔE 0.071
- Hunter Green #0B4008 ΔE 0.072
- Charcoal Grey #3C4142 ΔE 0.073
- Onyx #343A40 ΔE 0.074
- Evergreen #05472A ΔE 0.074
- Pine Green #0A481E ΔE 0.075
Use #40370B 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.