#644B37
Closest named color: Mud Brown (#60460F). oklch(43.4% 0.046 59.8), rgb(100, 75, 55).
Aa
White text reads best on this color (8.06:1).
About this color
#644B37 is a dark, muted brown. In OKLCH its lightness is 43%, its chroma 0.046 and its hue 60°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.044 away. White text reads best on it, at 8.06:1.
| Hue family | Browns |
| Lightness | dark (43%) |
| Chroma | muted (0.046) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.60:1 |
| White text | 8.06:1 |
Values
| HEX | #644B37 |
| RGB | rgb(100, 75, 55) |
| HSL | hsl(27, 29%, 30%) |
| OKLCH | oklch(43.4% 0.046 59.8) |
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 #644B37 | 8.06:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #644B37 | 2.60:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #644B37 text on white | 8.06:1 | AAA | Lc 87.9 | Fine for body text |
| #644B37 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
#CEBDB0
oklch(80.9% 0.026 59.8)
-
Step 400
400
#B59B86
oklch(70.7% 0.043 61)
-
Step 500
500
#A38268
oklch(63.1% 0.055 59.8)
-
Step 600
600
#8E6B4F
oklch(55.6% 0.061 59.8)
-
Step 700
700
#785940
oklch(49% 0.055 59.9)
-
Step 800
800 (this color)
#644B37
oklch(43.4% 0.046 59.8)
-
Step 900
900
#503D2E
oklch(37.6% 0.036 59.7)
-
Step 950
950
#2F241B
oklch(27% 0.023 60.9)
#644B37 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) | #534D36 | 0.030 |
| Deuteranopia (no green cones) | #585237 | 0.029 |
| Tritanopia (no blue cones) | #6B4646 | 0.034 |
| Achromatopsia (no color) | #505050 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644B37
#644B37
oklch(43.4% 0.046 59.8)
- #395568
#395568
oklch(43.5% 0.046 238.9)
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 #644B37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.044
- Purple Brown #673A3F ΔE 0.055
- Milk Chocolate #7F4E1E ΔE 0.058
- Brownish Purple #76424E ΔE 0.061
- Olive Brown #645403 ΔE 0.062
- Green Brown #544E03 ΔE 0.065
- Medium Brown #7F5112 ΔE 0.066
- Mud #735C12 ΔE 0.076
Use #644B37 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.