#370B21
Closest named color: Dark Plum (#3F012C). oklch(23.6% 0.074 353.5), rgb(55, 11, 33).
Aa
White text reads best on this color (17.04:1).
About this color
#370B21 is a very dark, moderately saturated red. In OKLCH its lightness is 24%, its chroma 0.074 and its hue 354°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Plum (#3F012C), ΔE 0.034 away. White text reads best on it, at 17.04:1.
| Hue family | Reds |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.074) |
| Temperature | warm |
| Nearest name | Dark Plum (#3F012C) |
| Black text | 1.23:1 |
| White text | 17.04:1 |
Values
| HEX | #370B21 |
| RGB | rgb(55, 11, 33) |
| HSL | hsl(330, 67%, 13%) |
| OKLCH | oklch(23.6% 0.074 353.5) |
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 #370B21 | 17.04:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #370B21 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #370B21 text on white | 17.04:1 | AAA | Lc 103.5 | Preferred for body text |
| #370B21 text on black | 1.23:1 | 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
#FCF2F6
oklch(97% 0.012 351)
-
Step 100
100
#F9E3EB
oklch(93.6% 0.026 353.5)
-
Step 200
200
#F4CCDB
oklch(88.4% 0.049 353.6)
-
Step 300
300
#EEA9C5
oklch(80.8% 0.088 353.2)
-
Step 400
400
#E379A7
oklch(70.8% 0.141 353.9)
-
Step 500
500
#D75192
oklch(63.1% 0.18 353.4)
-
Step 600
600
#C22E7C
oklch(55.6% 0.195 353.5)
-
Step 700
700
#A71E68
oklch(49% 0.181 353.7)
-
Step 800
800
#881D55
oklch(42.7% 0.15 353.7)
-
Step 900
900
#6D1F46
oklch(37.6% 0.117 353.5)
-
Step 950
950 (this color)
#370B21
oklch(23.6% 0.074 353.5)
#370B21 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) | #121722 | 0.083 |
| Deuteranopia (no green cones) | #1F1F20 | 0.074 |
| Tritanopia (no blue cones) | #3C0814 | 0.026 |
| Achromatopsia (no color) | #1C1C1C | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #370B21
#370B21
oklch(23.6% 0.074 353.5)
- #00251C
#00251C
oklch(23.6% 0.045 172.7)
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 #370B21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Plum #3F012C ΔE 0.034
- Aubergine #3D0734 ΔE 0.040
- Eggplant #380835 ΔE 0.040
- Dark Maroon #3C0008 ΔE 0.043
- Deep Brown #410200 ΔE 0.057
- Dark Purple #35063E ΔE 0.059
- Very Dark Purple #2A0134 ΔE 0.062
- Deep Purple #36013F ΔE 0.065
Use #370B21 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.