#664240
Closest named color: Purple Brown (#673A3F). oklch(42% 0.051 22.9), rgb(102, 66, 64).
Aa
White text reads best on this color (8.68:1).
About this color
#664240 is a dark, muted red. In OKLCH its lightness is 42%, its chroma 0.051 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.022 away. White text reads best on it, at 8.68:1.
| Hue family | Reds |
| Lightness | dark (42%) |
| Chroma | muted (0.051) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.41:1 |
| White text | 8.68:1 |
Values
| HEX | #664240 |
| RGB | rgb(102, 66, 64) |
| HSL | hsl(3, 23%, 33%) |
| OKLCH | oklch(42% 0.051 22.9) |
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 #664240 | 8.68:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #664240 | 2.41:1 | Fails | Lc 14.3 | Not readable |
| #664240 text on white | 8.68:1 | AAA | Lc 89.7 | Fine for body text |
| #664240 text on black | 2.41:1 | Fails | Lc -12.6 | 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 800.
-
Step 50
50
#F8F4F4
oklch(97% 0.004 17.2)
-
Step 100
100
#F0E8E7
oklch(93.7% 0.009 26)
-
Step 200
200
#E4D5D4
oklch(88.5% 0.017 22.1)
-
Step 300
300
#D3BAB8
oklch(81% 0.029 23.2)
-
Step 400
400
#BD9693
oklch(70.8% 0.047 23.4)
-
Step 500
500
#AB7B78
oklch(63% 0.061 23)
-
Step 600
600
#966461
oklch(55.6% 0.065 23.2)
-
Step 700
700
#805350
oklch(49.1% 0.061 23.7)
-
Step 800
800 (this color)
#664240
oklch(42% 0.051 22.9)
-
Step 900
900
#553938
oklch(37.7% 0.04 21.4)
-
Step 950
950
#322221
oklch(27.1% 0.025 22.9)
#664240 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) | #494740 | 0.053 |
| Deuteranopia (no green cones) | #524E3F | 0.049 |
| Tritanopia (no blue cones) | #6D3E42 | 0.018 |
| Achromatopsia (no color) | #4B4B4B | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664240
#664240
oklch(42% 0.051 22.9)
- #275559
#275559
oklch(41.9% 0.051 203)
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 #664240, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.022
- Brownish Purple #76424E ΔE 0.039
- Mud Brown #60460F ΔE 0.067
- Charcoal Grey #3C4142 ΔE 0.075
- Chestnut #742802 ΔE 0.077
- Milk Chocolate #7F4E1E ΔE 0.079
- Red Brown #8B2E16 ΔE 0.084
- Dark Mauve #874C62 ΔE 0.086
Use #664240 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.