#644C3F
Closest named color: Purple Brown (#673A3F). oklch(43.8% 0.039 49.8), rgb(100, 76, 63).
Aa
White text reads best on this color (7.93:1).
About this color
#644C3F is a dark, muted brown. In OKLCH its lightness is 44%, its chroma 0.039 and its hue 50°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.052 away. White text reads best on it, at 7.93:1.
| Hue family | Browns |
| Lightness | dark (44%) |
| Chroma | muted (0.039) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.64:1 |
| White text | 7.93:1 |
Values
| HEX | #644C3F |
| RGB | rgb(100, 76, 63) |
| HSL | hsl(21, 23%, 32%) |
| OKLCH | oklch(43.8% 0.039 49.8) |
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 #644C3F | 7.93:1 | AAA | Lc -92.2 | Preferred for body text |
| Black text on #644C3F | 2.64:1 | Fails | Lc 16.5 | Dividers and decoration only |
| #644C3F text on white | 7.93:1 | AAA | Lc 87.5 | Fine for body text |
| #644C3F text on black | 2.64:1 | Fails | Lc -14.7 | 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
#F7F5F4
oklch(97.1% 0.003 48.7)
-
Step 100
100
#EEE9E6
oklch(93.7% 0.007 53.4)
-
Step 200
200
#E0D7D2
oklch(88.5% 0.012 51.3)
-
Step 300
300
#CDBDB4
oklch(80.9% 0.022 51.5)
-
Step 400
400
#B49B8D
oklch(70.8% 0.036 51.1)
-
Step 500
500
#A18271
oklch(63.1% 0.046 50.3)
-
Step 600
600
#8C6B59
oklch(55.6% 0.05 49.9)
-
Step 700
700
#775949
oklch(49.1% 0.047 49.3)
-
Step 800
800 (this color)
#644C3F
oklch(43.8% 0.039 49.8)
-
Step 900
900
#4F3D33
oklch(37.7% 0.03 50.5)
-
Step 950
950
#2E241E
oklch(27% 0.019 52.6)
#644C3F 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) | #524E3E | 0.032 |
| Deuteranopia (no green cones) | #58533F | 0.028 |
| Tritanopia (no blue cones) | #6A4848 | 0.024 |
| Achromatopsia (no color) | #515151 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644C3F
#644C3F
oklch(43.8% 0.039 49.8)
- #3B5663
#3B5663
oklch(43.7% 0.039 229.4)
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 #644C3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.052
- Brownish Purple #76424E ΔE 0.053
- Mud Brown #60460F ΔE 0.055
- Milk Chocolate #7F4E1E ΔE 0.063
- Olive Brown #645403 ΔE 0.071
- Medium Brown #7F5112 ΔE 0.071
- Green Brown #544E03 ΔE 0.075
- Saddle Brown #8B4513 ΔE 0.080
Use #644C3F 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.