#663F25
Closest named color: Mud Brown (#60460F). oklch(40.8% 0.067 53.4), rgb(102, 63, 37).
Aa
White text reads best on this color (9.11:1).
About this color
#663F25 is a dark, muted brown. In OKLCH its lightness is 41%, its chroma 0.067 and its hue 53°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.036 away. White text reads best on it, at 9.11:1.
| Hue family | Browns |
| Lightness | dark (41%) |
| Chroma | muted (0.067) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #663F25 |
| RGB | rgb(102, 63, 37) |
| HSL | hsl(24, 47%, 27%) |
| OKLCH | oklch(40.8% 0.067 53.4) |
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 #663F25 | 9.11:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #663F25 | 2.30:1 | Fails | Lc 13.2 | Not readable |
| #663F25 text on white | 9.11:1 | AAA | Lc 90.8 | Preferred for body text |
| #663F25 text on black | 2.30:1 | Fails | Lc -11.5 | 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
#F8F4F2
oklch(97% 0.005 48.7)
-
Step 100
100
#F0E8E3
oklch(93.6% 0.011 54.5)
-
Step 200
200
#E5D6CC
oklch(88.5% 0.022 56.1)
-
Step 300
300
#D6BAAA
oklch(80.9% 0.039 51.6)
-
Step 400
400
#C0967C
oklch(70.6% 0.062 53.2)
-
Step 500
500
#B07C5B
oklch(63.1% 0.08 53.2)
-
Step 600
600
#9B6440
oklch(55.5% 0.087 53.2)
-
Step 700
700
#845332
oklch(49% 0.081 53.7)
-
Step 800
800 (this color)
#663F25
oklch(40.8% 0.067 53.4)
-
Step 900
900
#583A26
oklch(37.8% 0.053 54.1)
-
Step 950
950
#332217
oklch(27% 0.033 53.8)
#663F25 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) | #4A4323 | 0.053 |
| Deuteranopia (no green cones) | #534C25 | 0.050 |
| Tritanopia (no blue cones) | #6F3739 | 0.045 |
| Achromatopsia (no color) | #484848 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F25
#663F25
oklch(40.8% 0.067 53.4)
- #1E5068
#1E5068
oklch(40.9% 0.066 232.6)
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 #663F25, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.036
- Purple Brown #673A3F ΔE 0.045
- Chestnut #742802 ΔE 0.056
- Milk Chocolate #7F4E1E ΔE 0.068
- Brownish Purple #76424E ΔE 0.069
- Green Brown #544E03 ΔE 0.069
- Olive Brown #645403 ΔE 0.074
- Rust Brown #8B3103 ΔE 0.075
Use #663F25 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.