#664F36
Closest named color: Mud Brown (#60460F). oklch(44.5% 0.049 68.4), rgb(102, 79, 54).
Aa
White text reads best on this color (7.67:1).
About this color
#664F36 is a dark, muted brown. In OKLCH its lightness is 45%, its chroma 0.049 and its hue 68°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.046 away. White text reads best on it, at 7.67:1.
| Hue family | Browns |
| Lightness | dark (45%) |
| Chroma | muted (0.049) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.73:1 |
| White text | 7.67:1 |
Values
| HEX | #664F36 |
| RGB | rgb(102, 79, 54) |
| HSL | hsl(31, 31%, 31%) |
| OKLCH | oklch(44.5% 0.049 68.4) |
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 #664F36 | 7.67:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #664F36 | 2.73:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #664F36 text on white | 7.67:1 | AAA | Lc 86.6 | Fine for body text |
| #664F36 text on black | 2.73:1 | Fails | Lc -15.5 | Dividers and decoration only |
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
#F7F5F3
oklch(97.1% 0.003 67.8)
-
Step 100
100
#EEE9E4
oklch(93.7% 0.009 67.7)
-
Step 200
200
#E0D7CE
oklch(88.4% 0.016 67.6)
-
Step 300
300
#CDBEAD
oklch(80.9% 0.029 70.9)
-
Step 400
400
#B49C82
oklch(70.7% 0.046 69.2)
-
Step 500
500
#A18363
oklch(63% 0.058 68.3)
-
Step 600
600
#8C6D4A
oklch(55.7% 0.063 69.3)
-
Step 700
700
#775B3B
oklch(49.2% 0.059 69.5)
-
Step 800
800 (this color)
#664F36
oklch(44.5% 0.049 68.4)
-
Step 900
900
#4F3E2B
oklch(37.7% 0.038 69.4)
-
Step 950
950
#2E241A
oklch(26.9% 0.023 66.6)
#664F36 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) | #575034 | 0.027 |
| Deuteranopia (no green cones) | #5C5536 | 0.024 |
| Tritanopia (no blue cones) | #6D4A49 | 0.039 |
| Achromatopsia (no color) | #535353 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664F36
#664F36
oklch(44.5% 0.049 68.4)
- #3E566E
#3E566E
oklch(44.4% 0.049 249)
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 #664F36, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.046
- Milk Chocolate #7F4E1E ΔE 0.050
- Olive Brown #645403 ΔE 0.053
- Medium Brown #7F5112 ΔE 0.056
- Green Brown #544E03 ΔE 0.062
- Mud #735C12 ΔE 0.064
- Brownish Purple #76424E ΔE 0.067
- Purple Brown #673A3F ΔE 0.067
Use #664F36 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.