#37181F
Closest named color: Dark Brown (#341C02). oklch(25.6% 0.05 6.9), rgb(55, 24, 31).
Aa
White text reads best on this color (15.99:1).
About this color
#37181F is a dark, muted red. In OKLCH its lightness is 26%, its chroma 0.050 and its hue 7°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Brown (#341C02), ΔE 0.050 away. White text reads best on it, at 15.99:1.
| Hue family | Reds |
| Lightness | dark (26%) |
| Chroma | muted (0.050) |
| Temperature | warm |
| Nearest name | Dark Brown (#341C02) |
| Black text | 1.31:1 |
| White text | 15.99:1 |
Values
| HEX | #37181F |
| RGB | rgb(55, 24, 31) |
| HSL | hsl(346, 39%, 15%) |
| OKLCH | oklch(25.6% 0.05 6.9) |
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 #37181F | 15.99:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #37181F | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #37181F text on white | 15.99:1 | AAA | Lc 102.8 | Preferred for body text |
| #37181F text on black | 1.31:1 | 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
#F5E5E8
oklch(93.5% 0.018 4.5)
-
Step 200
200
#EED1D5
oklch(88.6% 0.033 8.3)
-
Step 300
300
#E3B1BA
oklch(80.8% 0.059 6.4)
-
Step 400
400
#D38796
oklch(70.6% 0.095 6.9)
-
Step 500
500
#C6687D
oklch(63.2% 0.121 6.9)
-
Step 600
600
#B14D66
oklch(55.5% 0.132 6.8)
-
Step 700
700
#983E55
oklch(49.2% 0.122 6.8)
-
Step 800
800
#7B3445
oklch(42.7% 0.1 7.4)
-
Step 900
900
#642E3A
oklch(37.8% 0.079 7.6)
-
Step 950
950 (this color)
#37181F
oklch(25.6% 0.05 6.9)
#37181F 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) | #1D1E1F | 0.056 |
| Deuteranopia (no green cones) | #25241E | 0.052 |
| Tritanopia (no blue cones) | #3C151B | 0.013 |
| Achromatopsia (no color) | #222222 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37181F
#37181F
oklch(25.6% 0.05 6.9)
- #002A27
#002A27
oklch(25.7% 0.045 187.5)
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 #37181F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Brown #341C02 ΔE 0.050
- Chocolate Brown #411900 ΔE 0.050
- Dark Maroon #3C0008 ΔE 0.054
- Jet #212529 ΔE 0.055
- Deep Brown #410200 ΔE 0.056
- Dark Plum #3F012C ΔE 0.061
- Mahogany #4A0100 ΔE 0.062
- Aubergine #3D0734 ΔE 0.062
Use #37181F 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.