#210B0B
Closest named color: Very Dark Brown (#1D0200). oklch(18.5% 0.038 21.4), rgb(33, 11, 11).
Aa
White text reads best on this color (18.79:1).
About this color
#210B0B is a very dark, muted red. In OKLCH its lightness is 18%, its chroma 0.038 and its hue 21°. Its hue sits on the warm side of the wheel. The nearest named color is Very Dark Brown (#1D0200), ΔE 0.039 away. White text reads best on it, at 18.79:1.
| Hue family | Reds |
| Lightness | very dark (18%) |
| Chroma | muted (0.038) |
| Temperature | warm |
| Nearest name | Very Dark Brown (#1D0200) |
| Black text | 1.11:1 |
| White text | 18.79:1 |
Values
| HEX | #210B0B |
| RGB | rgb(33, 11, 11) |
| HSL | hsl(0, 50%, 9%) |
| OKLCH | oklch(18.5% 0.038 21.4) |
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 #210B0B | 18.79:1 | AAA | Lc -107.2 | Preferred for body text |
| Black text on #210B0B | 1.11:1 | Fails | Lc 0.0 | Not readable |
| #210B0B text on white | 18.79:1 | AAA | Lc 105.2 | Preferred for body text |
| #210B0B text on black | 1.11:1 | 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
#F9F4F4
oklch(97.1% 0.005 17.2)
-
Step 100
100
#F3E7E6
oklch(93.7% 0.013 23.2)
-
Step 200
200
#E9D3D2
oklch(88.5% 0.025 20.8)
-
Step 300
300
#DCB6B4
oklch(80.9% 0.044 21.6)
-
Step 400
400
#CA8F8D
oklch(70.7% 0.072 21.2)
-
Step 500
500
#BB7271
oklch(63.1% 0.093 20.9)
-
Step 600
600
#A65A59
oklch(55.6% 0.1 21.6)
-
Step 700
700
#8E4949
oklch(49% 0.094 21)
-
Step 800
800
#733D3C
oklch(42.7% 0.076 21.9)
-
Step 900
900
#5E3433
oklch(37.7% 0.061 21.8)
-
Step 950
950 (this color)
#210B0B
oklch(18.5% 0.038 21.4)
#210B0B 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) | #100F0B | 0.040 |
| Deuteranopia (no green cones) | #15130B | 0.037 |
| Tritanopia (no blue cones) | #25080B | 0.012 |
| Achromatopsia (no color) | #121212 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #210B0B
#210B0B
oklch(18.5% 0.038 21.4)
- #001718
#001718
oklch(18.6% 0.032 198.5)
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 #210B0B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Very Dark Brown #1D0200 ΔE 0.039
- Almost Black #070D0D ΔE 0.058
- Dark Maroon #3C0008 ΔE 0.066
- Rich Navy #001219 ΔE 0.070
- Rich Black #0D1B2A ΔE 0.074
- Dark Brown #341C02 ΔE 0.078
- Deep Brown #410200 ΔE 0.078
- Jet #212529 ΔE 0.089
Use #210B0B 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.