#664B13
Closest named color: Mud Brown (#60460F). oklch(43.1% 0.079 81.4), rgb(102, 75, 19).
Aa
White text reads best on this color (8.13:1).
About this color
#664B13 is a dark, moderately saturated brown. In OKLCH its lightness is 43%, its chroma 0.079 and its hue 81°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.019 away. White text reads best on it, at 8.13:1.
| Hue family | Browns |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.079) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.58:1 |
| White text | 8.13:1 |
Values
| HEX | #664B13 |
| RGB | rgb(102, 75, 19) |
| HSL | hsl(40, 69%, 24%) |
| OKLCH | oklch(43.1% 0.079 81.4) |
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 #664B13 | 8.13:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #664B13 | 2.58:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #664B13 text on white | 8.13:1 | AAA | Lc 88.0 | Fine for body text |
| #664B13 text on black | 2.58:1 | Fails | Lc -14.1 | 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
#F7F5F1
oklch(97.1% 0.006 84.6)
-
Step 100
100
#EEE9E0
oklch(93.5% 0.013 82.4)
-
Step 200
200
#E2D8C7
oklch(88.6% 0.025 81.1)
-
Step 300
300
#D0BE9F
oklch(80.9% 0.047 81.3)
-
Step 400
400
#B89C6B
oklch(70.6% 0.074 81.1)
-
Step 500
500
#A68341
oklch(63% 0.095 81.4)
-
Step 600
600
#926C1E
oklch(55.6% 0.103 80.9)
-
Step 700
700
#7C5A0F
oklch(49.1% 0.096 81.2)
-
Step 800
800 (this color)
#664B13
oklch(43.1% 0.079 81.4)
-
Step 900
900
#523E17
oklch(37.7% 0.061 81.6)
-
Step 950
950
#30240F
oklch(26.9% 0.038 80)
#664B13 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) | #564B0A | 0.031 |
| Deuteranopia (no green cones) | #5C5216 | 0.026 |
| Tritanopia (no blue cones) | #6F4340 | 0.069 |
| Achromatopsia (no color) | #4F4F4F | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664B13
#664B13
oklch(43.1% 0.079 81.4)
- #37507C
#37507C
oklch(43.2% 0.079 261.1)
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 #664B13, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.019
- Olive Brown #645403 ΔE 0.030
- Green Brown #544E03 ΔE 0.037
- Milk Chocolate #7F4E1E ΔE 0.051
- Medium Brown #7F5112 ΔE 0.052
- Mud #735C12 ΔE 0.057
- Greeny Brown #696006 ΔE 0.064
- Army Green #4B5D16 ΔE 0.067
Use #664B13 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.