#644D38
Closest named color: Mud Brown (#60460F). oklch(43.9% 0.045 63.6), rgb(100, 77, 56).
Aa
White text reads best on this color (7.89:1).
About this color
#644D38 is a dark, muted brown. In OKLCH its lightness is 44%, its chroma 0.045 and its hue 64°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.045 away. White text reads best on it, at 7.89:1.
| Hue family | Browns |
| Lightness | dark (44%) |
| Chroma | muted (0.045) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.66:1 |
| White text | 7.89:1 |
Values
| HEX | #644D38 |
| RGB | rgb(100, 77, 56) |
| HSL | hsl(29, 28%, 31%) |
| OKLCH | oklch(43.9% 0.045 63.6) |
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 #644D38 | 7.89:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #644D38 | 2.66:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #644D38 text on white | 7.89:1 | AAA | Lc 87.3 | Fine for body text |
| #644D38 text on black | 2.66:1 | Fails | Lc -14.8 | 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
#E0D7CF
oklch(88.4% 0.015 64.3)
-
Step 300
300
#CDBDB0
oklch(80.8% 0.026 61.6)
-
Step 400
400
#B49C86
oklch(70.8% 0.042 64.6)
-
Step 500
500
#A18368
oklch(63.1% 0.053 63.6)
-
Step 600
600
#8C6C4F
oklch(55.6% 0.059 63.3)
-
Step 700
700
#775A40
oklch(49.1% 0.054 62.9)
-
Step 800
800 (this color)
#644D38
oklch(43.9% 0.045 63.6)
-
Step 900
900
#4F3E2E
oklch(37.8% 0.035 64.7)
-
Step 950
950
#2E241B
oklch(26.9% 0.022 63.7)
#644D38 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) | #544E36 | 0.029 |
| Deuteranopia (no green cones) | #5A5338 | 0.024 |
| Tritanopia (no blue cones) | #6B4848 | 0.035 |
| Achromatopsia (no color) | #515151 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644D38
#644D38
oklch(43.9% 0.045 63.6)
- #3D5569
#3D5569
oklch(43.8% 0.044 244.2)
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 #644D38, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.045
- Milk Chocolate #7F4E1E ΔE 0.056
- Olive Brown #645403 ΔE 0.059
- Purple Brown #673A3F ΔE 0.060
- Brownish Purple #76424E ΔE 0.063
- Medium Brown #7F5112 ΔE 0.063
- Green Brown #544E03 ΔE 0.064
- Mud #735C12 ΔE 0.072
Use #644D38 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.