#37181C
Closest named color: Dark Brown (#341C02). oklch(25.5% 0.049 13.1), rgb(55, 24, 28).
Aa
White text reads best on this color (16.03:1).
About this color
#37181C is a dark, muted red. In OKLCH its lightness is 26%, its chroma 0.049 and its hue 13°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Brown (#341C02), ΔE 0.045 away. White text reads best on it, at 16.03:1.
| Hue family | Reds |
| Lightness | dark (26%) |
| Chroma | muted (0.049) |
| Temperature | warm |
| Nearest name | Dark Brown (#341C02) |
| Black text | 1.30:1 |
| White text | 16.03:1 |
Values
| HEX | #37181C |
| RGB | rgb(55, 24, 28) |
| HSL | hsl(352, 39%, 15%) |
| OKLCH | oklch(25.5% 0.049 13.1) |
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 #37181C | 16.03:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #37181C | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #37181C text on white | 16.03:1 | AAA | Lc 102.8 | Preferred for body text |
| #37181C text on black | 1.30:1 | 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 950.
-
Step 50
50
#FBF3F4
oklch(97.1% 0.009 8.5)
-
Step 100
100
#F5E6E6
oklch(93.7% 0.016 17.4)
-
Step 200
200
#EED1D3
oklch(88.5% 0.033 13)
-
Step 300
300
#E4B2B6
oklch(81% 0.058 13.1)
-
Step 400
400
#D48890
oklch(70.7% 0.094 12.9)
-
Step 500
500
#C76975
oklch(63.2% 0.12 13)
-
Step 600
600
#B24E5D
oklch(55.6% 0.131 13.1)
-
Step 700
700
#993F4D
oklch(49.2% 0.121 13.1)
-
Step 800
800
#7C343F
oklch(42.7% 0.1 13)
-
Step 900
900
#642E36
oklch(37.6% 0.078 12.3)
-
Step 950
950 (this color)
#37181C
oklch(25.5% 0.049 13.1)
#37181C 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) | #1E1E1C | 0.054 |
| Deuteranopia (no green cones) | #26241B | 0.051 |
| Tritanopia (no blue cones) | #3C141A | 0.014 |
| Achromatopsia (no color) | #212121 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37181C
#37181C
oklch(25.5% 0.049 13.1)
- #002929
#002929
oklch(25.4% 0.043 194.8)
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 #37181C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Brown #341C02 ΔE 0.045
- Chocolate Brown #411900 ΔE 0.046
- Dark Maroon #3C0008 ΔE 0.052
- Deep Brown #410200 ΔE 0.052
- Jet #212529 ΔE 0.056
- Mahogany #4A0100 ΔE 0.059
- Dark Plum #3F012C ΔE 0.065
- Dark #1B2431 ΔE 0.066
Use #37181C 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.