#663E1B
Closest named color: Mud Brown (#60460F). oklch(40.4% 0.074 59.3), rgb(102, 62, 27).
Aa
White text reads best on this color (9.25:1).
About this color
#663E1B is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.074 and its hue 59°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.030 away. White text reads best on it, at 9.25:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.074) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #663E1B |
| RGB | rgb(102, 62, 27) |
| HSL | hsl(28, 58%, 25%) |
| OKLCH | oklch(40.4% 0.074 59.3) |
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 #663E1B | 9.25:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #663E1B | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #663E1B text on white | 9.25:1 | AAA | Lc 91.1 | Preferred for body text |
| #663E1B text on black | 2.26:1 | Fails | Lc -11.2 | 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
#F9F5F2
oklch(97.2% 0.006 59.7)
-
Step 100
100
#F1E8E2
oklch(93.6% 0.013 56.2)
-
Step 200
200
#E6D6CA
oklch(88.6% 0.024 59.4)
-
Step 300
300
#D7BBA5
oklch(81% 0.044 60.3)
-
Step 400
400
#C29775
oklch(70.8% 0.07 59.7)
-
Step 500
500
#B17C51
oklch(63% 0.088 59.3)
-
Step 600
600
#9D6434
oklch(55.6% 0.097 58.8)
-
Step 700
700
#865327
oklch(49.1% 0.09 59)
-
Step 800
800 (this color)
#663E1B
oklch(40.4% 0.074 59.3)
-
Step 900
900
#583A20
oklch(37.7% 0.058 60.6)
-
Step 950
950
#342214
oklch(27% 0.037 58.3)
#663E1B 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) | #4A4217 | 0.055 |
| Deuteranopia (no green cones) | #544B1B | 0.049 |
| Tritanopia (no blue cones) | #703536 | 0.053 |
| Achromatopsia (no color) | #474747 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663E1B
#663E1B
oklch(40.4% 0.074 59.3)
- #1B4E6D
#1B4E6D
oklch(40.5% 0.075 239.3)
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 #663E1B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.030
- Chestnut #742802 ΔE 0.053
- Purple Brown #673A3F ΔE 0.055
- Green Brown #544E03 ΔE 0.064
- Milk Chocolate #7F4E1E ΔE 0.069
- Olive Brown #645403 ΔE 0.070
- Rust Brown #8B3103 ΔE 0.074
- Medium Brown #7F5112 ΔE 0.076
Use #663E1B 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.