#644B39
Closest named color: Mud Brown (#60460F). oklch(43.5% 0.044 57), rgb(100, 75, 57).
Aa
White text reads best on this color (8.05:1).
About this color
#644B39 is a dark, muted brown. In OKLCH its lightness is 43%, its chroma 0.044 and its hue 57°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.047 away. White text reads best on it, at 8.05:1.
| Hue family | Browns |
| Lightness | dark (43%) |
| Chroma | muted (0.044) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.60:1 |
| White text | 8.05:1 |
Values
| HEX | #644B39 |
| RGB | rgb(100, 75, 57) |
| HSL | hsl(25, 27%, 31%) |
| OKLCH | oklch(43.5% 0.044 57) |
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 #644B39 | 8.05:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #644B39 | 2.60:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #644B39 text on white | 8.05:1 | AAA | Lc 87.9 | Fine for body text |
| #644B39 text on black | 2.60:1 | Fails | Lc -14.3 | 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
#F7F5F3
oklch(97.1% 0.003 67.8)
-
Step 100
100
#EEE9E5
oklch(93.7% 0.008 61.4)
-
Step 200
200
#E1D7D0
oklch(88.5% 0.015 57.6)
-
Step 300
300
#CEBDB1
oklch(80.9% 0.026 57.6)
-
Step 400
400
#B59B88
oklch(70.8% 0.041 58.2)
-
Step 500
500
#A3826A
oklch(63.2% 0.053 57.6)
-
Step 600
600
#8E6B52
oklch(55.7% 0.058 56.7)
-
Step 700
700
#785943
oklch(49.1% 0.053 56.5)
-
Step 800
800 (this color)
#644B39
oklch(43.5% 0.044 57)
-
Step 900
900
#503D30
oklch(37.7% 0.034 55.8)
-
Step 950
950
#2F241C
oklch(27.1% 0.022 57.7)
#644B39 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) | #524D38 | 0.032 |
| Deuteranopia (no green cones) | #585239 | 0.029 |
| Tritanopia (no blue cones) | #6B4646 | 0.032 |
| Achromatopsia (no color) | #505050 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644B39
#644B39
oklch(43.5% 0.044 57)
- #395567
#395567
oklch(43.5% 0.045 237.4)
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 #644B39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.047
- Purple Brown #673A3F ΔE 0.053
- Brownish Purple #76424E ΔE 0.058
- Milk Chocolate #7F4E1E ΔE 0.059
- Olive Brown #645403 ΔE 0.065
- Medium Brown #7F5112 ΔE 0.068
- Green Brown #544E03 ΔE 0.068
- Saddle Brown #8B4513 ΔE 0.077
Use #644B39 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.