#663F2E
Closest named color: Purple Brown (#673A3F). oklch(40.9% 0.061 44.2), rgb(102, 63, 46).
Aa
White text reads best on this color (9.06:1).
About this color
#663F2E is a dark, muted brown. In OKLCH its lightness is 41%, its chroma 0.061 and its hue 44°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.034 away. White text reads best on it, at 9.06:1.
| Hue family | Browns |
| Lightness | dark (41%) |
| Chroma | muted (0.061) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.31:1 |
| White text | 9.06:1 |
Values
| HEX | #663F2E |
| RGB | rgb(102, 63, 46) |
| HSL | hsl(18, 38%, 29%) |
| OKLCH | oklch(40.9% 0.061 44.2) |
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 #663F2E | 9.06:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #663F2E | 2.31:1 | Fails | Lc 13.3 | Not readable |
| #663F2E text on white | 9.06:1 | AAA | Lc 90.7 | Preferred for body text |
| #663F2E text on black | 2.31:1 | Fails | Lc -11.6 | 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
#F8F4F3
oklch(97% 0.005 34.3)
-
Step 100
100
#F0E8E4
oklch(93.6% 0.01 48.6)
-
Step 200
200
#E5D5CF
oklch(88.4% 0.02 41.8)
-
Step 300
300
#D6BAAE
oklch(81% 0.036 44.6)
-
Step 400
400
#C09684
oklch(70.8% 0.057 44.3)
-
Step 500
500
#AF7B65
oklch(63% 0.073 43.8)
-
Step 600
600
#9B644C
oklch(55.7% 0.08 44.3)
-
Step 700
700
#84533D
oklch(49.2% 0.074 44.8)
-
Step 800
800 (this color)
#663F2E
oklch(40.9% 0.061 44.2)
-
Step 900
900
#57392C
oklch(37.6% 0.048 44.2)
-
Step 950
950
#33221A
oklch(27% 0.03 46.2)
#663F2E 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) | #49442D | 0.055 |
| Deuteranopia (no green cones) | #524C2E | 0.051 |
| Tritanopia (no blue cones) | #6F383B | 0.036 |
| Achromatopsia (no color) | #494949 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F2E
#663F2E
oklch(40.9% 0.061 44.2)
- #1E5163
#1E5163
oklch(40.9% 0.061 224.7)
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 #663F2E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.034
- Mud Brown #60460F ΔE 0.047
- Brownish Purple #76424E ΔE 0.058
- Chestnut #742802 ΔE 0.059
- Milk Chocolate #7F4E1E ΔE 0.072
- Red Brown #8B2E16 ΔE 0.077
- Rust Brown #8B3103 ΔE 0.077
- Green Brown #544E03 ΔE 0.078
Use #663F2E 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.