#663A10
Closest named color: Mud Brown (#60460F). oklch(39.5% 0.082 59.5), rgb(102, 58, 16).
Aa
White text reads best on this color (9.64:1).
About this color
#663A10 is a dark, moderately saturated brown. In OKLCH its lightness is 39%, its chroma 0.082 and its hue 59°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.035 away. White text reads best on it, at 9.64:1.
| Hue family | Browns |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.082) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.17:1 |
| White text | 9.64:1 |
Values
| HEX | #663A10 |
| RGB | rgb(102, 58, 16) |
| HSL | hsl(29, 73%, 23%) |
| OKLCH | oklch(39.5% 0.082 59.5) |
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 #663A10 | 9.64:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #663A10 | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #663A10 text on white | 9.64:1 | AAA | Lc 92.0 | Preferred for body text |
| #663A10 text on black | 2.17:1 | Fails | Lc -10.4 | 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 900.
-
Step 50
50
#FAF4F0
oklch(97.1% 0.008 56.3)
-
Step 100
100
#F3E7DE
oklch(93.5% 0.018 59.5)
-
Step 200
200
#EBD4C3
oklch(88.4% 0.034 58.8)
-
Step 300
300
#DFB899
oklch(80.9% 0.062 60.2)
-
Step 400
400
#CE9160
oklch(70.6% 0.098 59)
-
Step 500
500
#C0752F
oklch(63.1% 0.125 59.8)
-
Step 600
600
#AA5D00
oklch(55.7% 0.131 59.4)
-
Step 700
700
#8F4D00
oklch(49% 0.116 59.2)
-
Step 800
800
#763F00
oklch(42.7% 0.101 59.7)
-
Step 900
900 (this color)
#663A10
oklch(39.5% 0.082 59.5)
-
Step 950
950
#392009
oklch(27.1% 0.052 60.1)
#663A10 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) | #473F0A | 0.062 |
| Deuteranopia (no green cones) | #524910 | 0.055 |
| Tritanopia (no blue cones) | #703032 | 0.059 |
| Achromatopsia (no color) | #454545 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663A10
#663A10
oklch(39.5% 0.082 59.5)
- #0E4B6E
#0E4B6E
oklch(39.4% 0.083 240.2)
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 #663A10, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.035
- Chestnut #742802 ΔE 0.046
- Purple Brown #673A3F ΔE 0.061
- Green Brown #544E03 ΔE 0.068
- Rust Brown #8B3103 ΔE 0.074
- Milk Chocolate #7F4E1E ΔE 0.077
- Olive Brown #645403 ΔE 0.077
- Red Brown #8B2E16 ΔE 0.078
Use #663A10 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.