#661B21
Closest named color: Reddy Brown (#6E1005). oklch(34.7% 0.107 20.3), rgb(102, 27, 33).
Aa
White text reads best on this color (12.04:1).
About this color
#661B21 is a dark, moderately saturated red. In OKLCH its lightness is 35%, its chroma 0.107 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.031 away. White text reads best on it, at 12.04:1.
| Hue family | Reds |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.107) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.74:1 |
| White text | 12.04:1 |
Values
| HEX | #661B21 |
| RGB | rgb(102, 27, 33) |
| HSL | hsl(355, 58%, 25%) |
| OKLCH | oklch(34.7% 0.107 20.3) |
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 #661B21 | 12.04:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #661B21 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #661B21 text on white | 12.04:1 | AAA | Lc 96.6 | Preferred for body text |
| #661B21 text on black | 1.74:1 | 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
#F9E4E3
oklch(93.5% 0.023 20.9)
-
Step 200
200
#F5CECD
oklch(88.4% 0.044 19.8)
-
Step 300
300
#F0ACAB
oklch(80.8% 0.08 19.9)
-
Step 400
400
#E57E7F
oklch(70.7% 0.127 20.2)
-
Step 500
500
#DB585E
oklch(63.1% 0.164 20.4)
-
Step 600
600
#C63845
oklch(55.6% 0.178 20.3)
-
Step 700
700
#AA2836
oklch(49% 0.165 20.4)
-
Step 800
800
#8A242D
oklch(42.6% 0.137 20.5)
-
Step 900
900 (this color)
#661B21
oklch(34.7% 0.107 20.3)
-
Step 950
950
#421618
oklch(27% 0.068 20.2)
#661B21 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) | #2F2C21 | 0.117 |
| Deuteranopia (no green cones) | #423C1F | 0.107 |
| Tritanopia (no blue cones) | #70071E | 0.028 |
| Achromatopsia (no color) | #363636 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #661B21
#661B21
oklch(34.7% 0.107 20.3)
- #004346
#004346
oklch(34.8% 0.059 199.9)
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 #661B21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.031
- Claret #680018 ΔE 0.031
- Burgundy #610023 ΔE 0.043
- Blood #770001 ΔE 0.045
- Wine Red #7B0323 ΔE 0.047
- Bordeaux #7B002C ΔE 0.053
- Chestnut #742802 ΔE 0.057
- Merlot #730039 ΔE 0.059
Use #661B21 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.