#66181C
Closest named color: Reddy Brown (#6E1005). oklch(34.2% 0.11 22.6), rgb(102, 24, 28).
Aa
White text reads best on this color (12.26:1).
About this color
#66181C is a dark, moderately saturated red. In OKLCH its lightness is 34%, its chroma 0.110 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.026 away. White text reads best on it, at 12.26:1.
| Hue family | Reds |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.110) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.71:1 |
| White text | 12.26:1 |
Values
| HEX | #66181C |
| RGB | rgb(102, 24, 28) |
| HSL | hsl(357, 62%, 25%) |
| OKLCH | oklch(34.2% 0.11 22.6) |
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 #66181C | 12.26:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #66181C | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #66181C text on white | 12.26:1 | AAA | Lc 96.9 | Preferred for body text |
| #66181C text on black | 1.71:1 | 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 900.
-
Step 50
50
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E2
oklch(93.6% 0.024 23.9)
-
Step 200
200
#F6CECB
oklch(88.5% 0.046 23.1)
-
Step 300
300
#F2ACA8
oklch(81% 0.083 22.7)
-
Step 400
400
#E87D7A
oklch(70.8% 0.133 22.7)
-
Step 500
500
#DD5658
oklch(63.1% 0.169 22.5)
-
Step 600
600
#C8353D
oklch(55.6% 0.183 22.8)
-
Step 700
700
#AD252F
oklch(49.1% 0.171 22.8)
-
Step 800
800
#8C2228
oklch(42.7% 0.141 22.7)
-
Step 900
900 (this color)
#66181C
oklch(34.2% 0.11 22.6)
-
Step 950
950
#421616
oklch(27% 0.069 22.8)
#66181C 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) | #2E2A1B | 0.120 |
| Deuteranopia (no green cones) | #423B1A | 0.109 |
| Tritanopia (no blue cones) | #71001A | 0.030 |
| Achromatopsia (no color) | #353535 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66181C
#66181C
oklch(34.2% 0.11 22.6)
- #004146
#004146
oklch(34.2% 0.058 203.4)
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 #66181C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.026
- Claret #680018 ΔE 0.027
- Burgundy #610023 ΔE 0.041
- Blood #770001 ΔE 0.042
- Wine Red #7B0323 ΔE 0.048
- Bordeaux #7B002C ΔE 0.055
- Chestnut #742802 ΔE 0.058
- Maroon #800000 ΔE 0.058
Use #66181C 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.