#21040A
Closest named color: Very Dark Brown (#1D0200). oklch(17% 0.052 10), rgb(33, 4, 10).
Aa
White text reads best on this color (19.32:1).
About this color
#21040A is a very dark, muted red. In OKLCH its lightness is 17%, its chroma 0.052 and its hue 10°. Its hue sits on the warm side of the wheel. The nearest named color is Very Dark Brown (#1D0200), ΔE 0.029 away. White text reads best on it, at 19.32:1.
| Hue family | Reds |
| Lightness | very dark (17%) |
| Chroma | muted (0.052) |
| Temperature | warm |
| Nearest name | Very Dark Brown (#1D0200) |
| Black text | 1.08:1 |
| White text | 19.32:1 |
Values
| HEX | #21040A |
| RGB | rgb(33, 4, 10) |
| HSL | hsl(348, 78%, 7%) |
| OKLCH | oklch(17% 0.052 10) |
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 #21040A | 19.32:1 | AAA | Lc -107.3 | Preferred for body text |
| Black text on #21040A | 1.08:1 | Fails | Lc 0.0 | Not readable |
| #21040A text on white | 19.32:1 | AAA | Lc 105.3 | Preferred for body text |
| #21040A text on black | 1.08:1 | 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
#F6E5E7
oklch(93.6% 0.019 9.3)
-
Step 200
200
#EFD0D4
oklch(88.5% 0.035 9)
-
Step 300
300
#E5B1B7
oklch(80.9% 0.061 10.8)
-
Step 400
400
#D68692
oklch(70.6% 0.099 10.2)
-
Step 500
500
#C96678
oklch(63.1% 0.127 9.9)
-
Step 600
600
#B44B61
oklch(55.6% 0.137 9.8)
-
Step 700
700
#9B3B50
oklch(49.1% 0.129 9.8)
-
Step 800
800
#7E3242
oklch(42.8% 0.106 9.7)
-
Step 900
900
#662D37
oklch(37.8% 0.082 10.9)
-
Step 950
950 (this color)
#21040A
oklch(17% 0.052 10)
#21040A 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) | #0A0A0A | 0.058 |
| Deuteranopia (no green cones) | #121009 | 0.053 |
| Tritanopia (no blue cones) | #250106 | 0.014 |
| Achromatopsia (no color) | #0E0E0E | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21040A
#21040A
oklch(17% 0.052 10)
- #001312
#001312
oklch(16.9% 0.029 190.6)
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 #21040A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Very Dark Brown #1D0200 ΔE 0.029
- Almost Black #070D0D ΔE 0.065
- Dark Maroon #3C0008 ΔE 0.069
- Rich Navy #001219 ΔE 0.081
- Deep Brown #410200 ΔE 0.084
- Very Dark Purple #2A0134 ΔE 0.087
- Rich Black #0D1B2A ΔE 0.090
- Midnight Purple #280137 ΔE 0.092
Use #21040A 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.