#66100D
Closest named color: Reddy Brown (#6E1005). oklch(33.3% 0.12 28), rgb(102, 16, 13).
Aa
White text reads best on this color (12.76:1).
About this color
#66100D is a dark, moderately saturated red. In OKLCH its lightness is 33%, its chroma 0.120 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.019 away. White text reads best on it, at 12.76:1.
| Hue family | Reds |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.120) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.64:1 |
| White text | 12.76:1 |
Values
| HEX | #66100D |
| RGB | rgb(102, 16, 13) |
| HSL | hsl(2, 77%, 23%) |
| OKLCH | oklch(33.3% 0.12 28) |
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 #66100D | 12.76:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #66100D | 1.64:1 | Fails | Lc 0.0 | Not readable |
| #66100D text on white | 12.76:1 | AAA | Lc 97.5 | Preferred for body text |
| #66100D text on black | 1.64:1 | 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
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FBE4E0
oklch(93.6% 0.026 29.4)
-
Step 200
200
#F9CDC7
oklch(88.5% 0.051 27.2)
-
Step 300
300
#F5ABA0
oklch(80.9% 0.089 28.6)
-
Step 400
400
#EC7A6D
oklch(70.6% 0.143 28)
-
Step 500
500
#E35145
oklch(63.1% 0.184 28.1)
-
Step 600
600
#CE2C26
oklch(55.6% 0.199 28.1)
-
Step 700
700
#B21B18
oklch(49.1% 0.185 28.2)
-
Step 800
800
#911B17
oklch(42.8% 0.154 28)
-
Step 900
900 (this color)
#66100D
oklch(33.3% 0.12 28)
-
Step 950
950
#441410
oklch(26.9% 0.075 27.9)
#66100D 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) | #2C260B | 0.129 |
| Deuteranopia (no green cones) | #413908 | 0.117 |
| Tritanopia (no blue cones) | #710011 | 0.026 |
| Achromatopsia (no color) | #323232 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66100D
#66100D
oklch(33.3% 0.12 28)
- #003E45
#003E45
oklch(33.3% 0.057 207.3)
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 #66100D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.019
- Claret #680018 ΔE 0.024
- Blood #770001 ΔE 0.037
- Burgundy #610023 ΔE 0.043
- Wine Red #7B0323 ΔE 0.054
- Maroon #800000 ΔE 0.056
- Chestnut #742802 ΔE 0.060
- Bordeaux #7B002C ΔE 0.063
Use #66100D 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.