#644E37
Closest named color: Mud Brown (#60460F). oklch(44.1% 0.046 67.4), rgb(100, 78, 55).
Aa
White text reads best on this color (7.81:1).
About this color
#644E37 is a dark, muted brown. In OKLCH its lightness is 44%, its chroma 0.046 and its hue 67°. 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 7.81:1.
| Hue family | Browns |
| Lightness | dark (44%) |
| Chroma | muted (0.046) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.68:1 |
| White text | 7.81:1 |
Values
| HEX | #644E37 |
| RGB | rgb(100, 78, 55) |
| HSL | hsl(31, 29%, 30%) |
| OKLCH | oklch(44.1% 0.046 67.4) |
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 #644E37 | 7.81:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #644E37 | 2.68:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #644E37 text on white | 7.81:1 | AAA | Lc 87.1 | Fine for body text |
| #644E37 text on black | 2.68:1 | Fails | Lc -15.0 | Dividers and decoration only |
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
#EDE9E4
oklch(93.6% 0.008 73.7)
-
Step 200
200
#E0D7CF
oklch(88.4% 0.015 64.3)
-
Step 300
300
#CDBEAF
oklch(81% 0.027 67.4)
-
Step 400
400
#B39C85
oklch(70.7% 0.042 67.1)
-
Step 500
500
#A08466
oklch(63.2% 0.055 68.5)
-
Step 600
600
#8B6D4D
oklch(55.6% 0.06 67.9)
-
Step 700
700
#765B3E
oklch(49.1% 0.055 68)
-
Step 800
800 (this color)
#644E37
oklch(44.1% 0.046 67.4)
-
Step 900
900
#4F3E2D
oklch(37.7% 0.036 66.4)
-
Step 950
950
#2E241B
oklch(26.9% 0.022 63.7)
#644E37 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) | #554F35 | 0.027 |
| Deuteranopia (no green cones) | #5B5437 | 0.023 |
| Tritanopia (no blue cones) | #6B4948 | 0.037 |
| Achromatopsia (no color) | #525252 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644E37
#644E37
oklch(44.1% 0.046 67.4)
- #3E556B
#3E556B
oklch(44% 0.046 247.8)
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 #644E37, 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 0.054
- Olive Brown #645403 ΔE 0.056
- Medium Brown #7F5112 ΔE 0.061
- Green Brown #544E03 ΔE 0.062
- Purple Brown #673A3F ΔE 0.063
- Brownish Purple #76424E ΔE 0.066
- Mud #735C12 ΔE 0.069
Use #644E37 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.