#370B01
Closest named color: Deep Brown (#410200). oklch(22.7% 0.073 37.1), rgb(55, 11, 1).
Aa
White text reads best on this color (17.34:1).
About this color
#370B01 is a very dark, moderately saturated red. In OKLCH its lightness is 23%, its chroma 0.073 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Deep Brown (#410200), ΔE 0.026 away. White text reads best on it, at 17.34:1.
| Hue family | Reds |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.073) |
| Temperature | warm |
| Nearest name | Deep Brown (#410200) |
| Black text | 1.21:1 |
| White text | 17.34:1 |
Values
| HEX | #370B01 |
| RGB | rgb(55, 11, 1) |
| HSL | hsl(11, 96%, 11%) |
| OKLCH | oklch(22.7% 0.073 37.1) |
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 #370B01 | 17.34:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #370B01 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #370B01 text on white | 17.34:1 | AAA | Lc 103.7 | Preferred for body text |
| #370B01 text on black | 1.21:1 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#FAE5DE
oklch(93.7% 0.025 39.4)
-
Step 200
200
#F7CFC3
oklch(88.5% 0.048 37.3)
-
Step 300
300
#F2AD99
oklch(80.8% 0.086 36.8)
-
Step 400
400
#E97F60
oklch(70.8% 0.138 37.1)
-
Step 500
500
#DF5830
oklch(63.1% 0.177 36.8)
-
Step 600
600
#C83B00
oklch(55.7% 0.186 37.1)
-
Step 700
700
#A93000
oklch(49.1% 0.164 37)
-
Step 800
800
#8C2600
oklch(42.7% 0.143 37)
-
Step 900
900
#72240A
oklch(37.8% 0.115 37.3)
-
Step 950
950 (this color)
#370B01
oklch(22.7% 0.073 37.1)
#370B01 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) | #181400 | 0.075 |
| Deuteranopia (no green cones) | #231E00 | 0.068 |
| Tritanopia (no blue cones) | #3E0109 | 0.030 |
| Achromatopsia (no color) | #1A1A1A | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #370B01
#370B01
oklch(22.7% 0.073 37.1)
- #002129
#002129
oklch(22.9% 0.041 217.2)
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 #370B01, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Brown #410200 ΔE 0.026
- Dark Maroon #3C0008 ΔE 0.029
- Dark Brown #341C02 ΔE 0.044
- Chocolate Brown #411900 ΔE 0.045
- Mahogany #4A0100 ΔE 0.045
- Very Dark Brown #1D0200 ΔE 0.079
- Dark Plum #3F012C ΔE 0.085
- Jet #212529 ΔE 0.088
Use #370B01 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.