#66210B
Closest named color: Reddy Brown (#6E1005). oklch(35.2% 0.104 37.2), rgb(102, 33, 11).
Aa
White text reads best on this color (11.74:1).
About this color
#66210B is a dark, moderately saturated red. In OKLCH its lightness is 35%, its chroma 0.104 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.028 away. White text reads best on it, at 11.74:1.
| Hue family | Reds |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.104) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.78:1 |
| White text | 11.74:1 |
Values
| HEX | #66210B |
| RGB | rgb(102, 33, 11) |
| HSL | hsl(15, 81%, 22%) |
| OKLCH | oklch(35.2% 0.104 37.2) |
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 #66210B | 11.74:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #66210B | 1.78:1 | Fails | Lc 7.7 | Not readable |
| #66210B text on white | 11.74:1 | AAA | Lc 96.2 | Preferred for body text |
| #66210B text on black | 1.78:1 | 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
#FCF3F0
oklch(97% 0.011 39.4)
-
Step 100
100
#F8E5DF
oklch(93.5% 0.022 38.3)
-
Step 200
200
#F4D0C5
oklch(88.5% 0.043 37.7)
-
Step 300
300
#EEAF9D
oklch(80.8% 0.079 36.6)
-
Step 400
400
#E38367
oklch(70.8% 0.125 37.1)
-
Step 500
500
#D85F3C
oklch(63.1% 0.161 36.8)
-
Step 600
600
#C34115
oklch(55.6% 0.174 37.1)
-
Step 700
700
#A83203
oklch(49.1% 0.161 37.4)
-
Step 800
800
#892B0A
oklch(42.8% 0.134 37.3)
-
Step 900
900 (this color)
#66210B
oklch(35.2% 0.104 37.2)
-
Step 950
950
#41190D
oklch(27.1% 0.066 37.3)
#66210B 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) | #352E07 | 0.105 |
| Deuteranopia (no green cones) | #463E08 | 0.096 |
| Tritanopia (no blue cones) | #710E1D | 0.044 |
| Achromatopsia (no color) | #383838 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66210B
#66210B
oklch(35.2% 0.104 37.2)
- #004350
#004350
oklch(35.3% 0.063 216)
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 #66210B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.028
- Chestnut #742802 ΔE 0.037
- Blood #770001 ΔE 0.046
- Claret #680018 ΔE 0.052
- Maroon #800000 ΔE 0.059
- Wine Red #7B0323 ΔE 0.064
- Burgundy #610023 ΔE 0.069
- Bordeaux #7B002C ΔE 0.074
Use #66210B 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.