#663A18
Closest named color: Mud Brown (#60460F). oklch(39.6% 0.078 55.5), rgb(102, 58, 24).
Aa
White text reads best on this color (9.61:1).
About this color
#663A18 is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.078 and its hue 55°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.039 away. White text reads best on it, at 9.61:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.078) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.18:1 |
| White text | 9.61:1 |
Values
| HEX | #663A18 |
| RGB | rgb(102, 58, 24) |
| HSL | hsl(26, 62%, 25%) |
| OKLCH | oklch(39.6% 0.078 55.5) |
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 #663A18 | 9.61:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #663A18 | 2.18:1 | Fails | Lc 11.9 | Not readable |
| #663A18 text on white | 9.61:1 | AAA | Lc 92.0 | Preferred for body text |
| #663A18 text on black | 2.18:1 | 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
#FAF4F1
oklch(97.1% 0.008 48.7)
-
Step 100
100
#F3E7DF
oklch(93.5% 0.017 56.2)
-
Step 200
200
#EBD4C5
oklch(88.5% 0.033 55.3)
-
Step 300
300
#DFB79D
oklch(80.8% 0.058 54.7)
-
Step 400
400
#CE9166
oklch(70.7% 0.094 55.7)
-
Step 500
500
#C0743B
oklch(63.1% 0.12 55.2)
-
Step 600
600
#AB5B12
oklch(55.5% 0.13 55.5)
-
Step 700
700
#934A00
oklch(49.1% 0.121 55.1)
-
Step 800
800
#773D08
oklch(42.6% 0.1 55.3)
-
Step 900
900 (this color)
#663A18
oklch(39.6% 0.078 55.5)
-
Step 950
950
#391F0C
oklch(27% 0.05 54.8)
#663A18 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) | #473F14 | 0.061 |
| Deuteranopia (no green cones) | #514918 | 0.057 |
| Tritanopia (no blue cones) | #703133 | 0.052 |
| Achromatopsia (no color) | #454545 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663A18
#663A18
oklch(39.6% 0.078 55.5)
- #0D4C6A
#0D4C6A
oklch(39.4% 0.078 235.5)
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 #663A18, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.039
- Chestnut #742802 ΔE 0.045
- Purple Brown #673A3F ΔE 0.054
- Green Brown #544E03 ΔE 0.072
- Rust Brown #8B3103 ΔE 0.074
- Red Brown #8B2E16 ΔE 0.076
- Milk Chocolate #7F4E1E ΔE 0.077
- Olive Brown #645403 ΔE 0.080
Use #663A18 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.