#664C03
Closest named color: Olive Brown (#645403). oklch(43.3% 0.087 85.5), rgb(102, 76, 3).
Aa
White text reads best on this color (8.07:1).
About this color
#664C03 is a dark, moderately saturated brown. In OKLCH its lightness is 43%, its chroma 0.087 and its hue 85°. Its hue sits on the warm side of the wheel. The nearest named color is Olive Brown (#645403), ΔE 0.023 away. White text reads best on it, at 8.07:1.
| Hue family | Browns |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.087) |
| Temperature | warm |
| Nearest name | Olive Brown (#645403) |
| Black text | 2.60:1 |
| White text | 8.07:1 |
Values
| HEX | #664C03 |
| RGB | rgb(102, 76, 3) |
| HSL | hsl(44, 94%, 21%) |
| OKLCH | oklch(43.3% 0.087 85.5) |
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 #664C03 | 8.07:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #664C03 | 2.60:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #664C03 text on white | 8.07:1 | AAA | Lc 87.8 | Fine for body text |
| #664C03 text on black | 2.60:1 | Fails | Lc -14.4 | 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
#F7F5F0
oklch(97% 0.007 88.6)
-
Step 100
100
#EEE9DF
oklch(93.5% 0.014 84.6)
-
Step 200
200
#E2D8C5
oklch(88.5% 0.028 83.5)
-
Step 300
300
#D0BF9C
oklch(81% 0.051 85.1)
-
Step 400
400
#B89D64
oklch(70.7% 0.082 85.1)
-
Step 500
500
#A68436
oklch(63.1% 0.104 85.2)
-
Step 600
600
#916D02
oklch(55.6% 0.113 85.5)
-
Step 700
700
#7A5B00
oklch(49% 0.1 85.4)
-
Step 800
800 (this color)
#664C03
oklch(43.3% 0.087 85.5)
-
Step 900
900
#523E0F
oklch(37.6% 0.068 84.6)
-
Step 950
950
#30250B
oklch(27.1% 0.043 86.1)
#664C03 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) | #574C00 | 0.028 |
| Deuteranopia (no green cones) | #5E5308 | 0.023 |
| Tritanopia (no blue cones) | #704440 | 0.078 |
| Achromatopsia (no color) | #505050 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664C03
#664C03
oklch(43.3% 0.087 85.5)
- #394E80
#394E80
oklch(43.1% 0.087 265.7)
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 #664C03, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Brown #645403 ΔE 0.023
- Mud Brown #60460F ΔE 0.023
- Green Brown #544E03 ΔE 0.033
- Medium Brown #7F5112 ΔE 0.052
- Mud #735C12 ΔE 0.053
- Milk Chocolate #7F4E1E ΔE 0.053
- Greeny Brown #696006 ΔE 0.059
- Army Green #4B5D16 ΔE 0.062
Use #664C03 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.