#664E27
Closest named color: Mud Brown (#60460F). oklch(44% 0.064 78), rgb(102, 78, 39).
Aa
White text reads best on this color (7.82:1).
About this color
#664E27 is a dark, muted brown. In OKLCH its lightness is 44%, its chroma 0.064 and its hue 78°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.031 away. White text reads best on it, at 7.82:1.
| Hue family | Browns |
| Lightness | dark (44%) |
| Chroma | muted (0.064) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.68:1 |
| White text | 7.82:1 |
Values
| HEX | #664E27 |
| RGB | rgb(102, 78, 39) |
| HSL | hsl(37, 45%, 28%) |
| OKLCH | oklch(44% 0.064 78) |
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 #664E27 | 7.82:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #664E27 | 2.68:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #664E27 text on white | 7.82:1 | AAA | Lc 87.1 | Fine for body text |
| #664E27 text on black | 2.68:1 | Fails | Lc -15.0 | 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
#F7F5F2
oklch(97.1% 0.005 78.3)
-
Step 100
100
#EEE9E2
oklch(93.6% 0.011 76.6)
-
Step 200
200
#E1D8CA
oklch(88.6% 0.021 79.1)
-
Step 300
300
#CEBEA6
oklch(80.8% 0.037 78.1)
-
Step 400
400
#B59C77
oklch(70.6% 0.059 77.3)
-
Step 500
500
#A38453
oklch(63.1% 0.076 78.2)
-
Step 600
600
#8E6D37
oklch(55.6% 0.083 78)
-
Step 700
700
#795B29
oklch(49.2% 0.078 78)
-
Step 800
800 (this color)
#664E27
oklch(44% 0.064 78)
-
Step 900
900
#503E22
oklch(37.6% 0.049 77.4)
-
Step 950
950
#2F2514
oklch(27.1% 0.032 80)
#664E27 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) | #574E23 | 0.028 |
| Deuteranopia (no green cones) | #5D5428 | 0.023 |
| Tritanopia (no blue cones) | #6E4745 | 0.055 |
| Achromatopsia (no color) | #525252 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664E27
#664E27
oklch(44% 0.064 78)
- #3C5376
#3C5376
oklch(43.9% 0.065 258.6)
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 #664E27, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.031
- Olive Brown #645403 ΔE 0.037
- Milk Chocolate #7F4E1E ΔE 0.046
- Green Brown #544E03 ΔE 0.047
- Medium Brown #7F5112 ΔE 0.050
- Mud #735C12 ΔE 0.055
- Greeny Brown #696006 ΔE 0.065
- Army Green #4B5D16 ΔE 0.069
Use #664E27 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.