#644A40
Closest named color: Purple Brown (#673A3F). oklch(43.4% 0.039 42), rgb(100, 74, 64).
Aa
White text reads best on this color (8.09:1).
About this color
#644A40 is a dark, muted brown. In OKLCH its lightness is 43%, its chroma 0.039 and its hue 42°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.045 away. White text reads best on it, at 8.09:1.
| Hue family | Browns |
| Lightness | dark (43%) |
| Chroma | muted (0.039) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.59:1 |
| White text | 8.09:1 |
Values
| HEX | #644A40 |
| RGB | rgb(100, 74, 64) |
| HSL | hsl(17, 22%, 32%) |
| OKLCH | oklch(43.4% 0.039 42) |
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 #644A40 | 8.09:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #644A40 | 2.59:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #644A40 text on white | 8.09:1 | AAA | Lc 88.0 | Fine for body text |
| #644A40 text on black | 2.59:1 | Fails | Lc -14.2 | 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
#F7F5F4
oklch(97.1% 0.003 48.7)
-
Step 100
100
#EEE8E6
oklch(93.5% 0.007 39.5)
-
Step 200
200
#E1D7D3
oklch(88.6% 0.012 43.3)
-
Step 300
300
#CEBCB5
oklch(80.8% 0.023 42.5)
-
Step 400
400
#B59A8F
oklch(70.7% 0.036 43.4)
-
Step 500
500
#A38173
oklch(63.2% 0.047 43.5)
-
Step 600
600
#8E6A5C
oklch(55.7% 0.051 42.2)
-
Step 700
700
#78584C
oklch(49.1% 0.047 41.5)
-
Step 800
800 (this color)
#644A40
oklch(43.4% 0.039 42)
-
Step 900
900
#503C35
oklch(37.6% 0.031 40.2)
-
Step 950
950
#2F231F
oklch(26.9% 0.02 39.2)
#644A40 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) | #504D3F | 0.036 |
| Deuteranopia (no green cones) | #565240 | 0.033 |
| Tritanopia (no blue cones) | #6B4647 | 0.023 |
| Achromatopsia (no color) | #505050 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644A40
#644A40
oklch(43.4% 0.039 42)
- #385660
#385660
oklch(43.4% 0.039 220.8)
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 #644A40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.045
- Brownish Purple #76424E ΔE 0.049
- Mud Brown #60460F ΔE 0.057
- Milk Chocolate #7F4E1E ΔE 0.066
- Medium Brown #7F5112 ΔE 0.076
- Olive Brown #645403 ΔE 0.076
- Charcoal Grey #3C4142 ΔE 0.078
- Green Brown #544E03 ΔE 0.079
Use #644A40 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.