#37001B
Closest named color: Dark Plum (#3F012C). oklch(21.9% 0.09 356.9), rgb(55, 0, 27).
Aa
White text reads best on this color (17.82:1).
About this color
#37001B is a very dark, moderately saturated red. In OKLCH its lightness is 22%, its chroma 0.090 and its hue 357°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Plum (#3F012C), ΔE 0.037 away. White text reads best on it, at 17.82:1.
| Hue family | Reds |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.090) |
| Temperature | warm |
| Nearest name | Dark Plum (#3F012C) |
| Black text | 1.17:1 |
| White text | 17.82:1 |
Values
| HEX | #37001B |
| RGB | rgb(55, 0, 27) |
| HSL | hsl(331, 100%, 11%) |
| OKLCH | oklch(21.9% 0.09 356.9) |
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 #37001B | 17.82:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #37001B | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #37001B text on white | 17.82:1 | AAA | Lc 103.7 | Preferred for body text |
| #37001B text on black | 1.17:1 | 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
#FEF2F5
oklch(97.1% 0.013 0.3)
-
Step 100
100
#FCE2EA
oklch(93.6% 0.03 357.1)
-
Step 200
200
#FBCADA
oklch(88.6% 0.059 356.9)
-
Step 300
300
#F8A4C2
oklch(80.9% 0.105 356.7)
-
Step 400
400
#F06DA2
oklch(70.7% 0.17 356.9)
-
Step 500
500
#E73A8B
oklch(63.1% 0.217 357.1)
-
Step 600
600
#CF0075
oklch(55.6% 0.227 357.1)
-
Step 700
700
#AF0062
oklch(49.1% 0.2 357.1)
-
Step 800
800
#910050
oklch(42.7% 0.174 357.2)
-
Step 900
900
#760F43
oklch(37.7% 0.141 356.7)
-
Step 950
950 (this color)
#37001B
oklch(21.9% 0.09 356.9)
#37001B 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) | #0C111C | 0.102 |
| Deuteranopia (no green cones) | #1C1B1A | 0.089 |
| Tritanopia (no blue cones) | #3D000C | 0.033 |
| Achromatopsia (no color) | #181818 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37001B
#37001B
oklch(21.9% 0.09 356.9)
- #00201A
#00201A
oklch(21.8% 0.04 177.8)
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 #37001B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Plum #3F012C ΔE 0.037
- Dark Maroon #3C0008 ΔE 0.037
- Aubergine #3D0734 ΔE 0.049
- Eggplant #380835 ΔE 0.050
- Deep Brown #410200 ΔE 0.056
- Very Dark Purple #2A0134 ΔE 0.063
- Dark Purple #35063E ΔE 0.068
- Mahogany #4A0100 ΔE 0.069
Use #37001B 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.