#643D21
Closest named color: Mud Brown (#60460F). oklch(40% 0.069 55), rgb(100, 61, 33).
Aa
White text reads best on this color (9.41:1).
About this color
#643D21 is a dark, muted brown. In OKLCH its lightness is 40%, its chroma 0.069 and its hue 55°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.036 away. White text reads best on it, at 9.41:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | muted (0.069) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.23:1 |
| White text | 9.41:1 |
Values
| HEX | #643D21 |
| RGB | rgb(100, 61, 33) |
| HSL | hsl(25, 50%, 26%) |
| OKLCH | oklch(40% 0.069 55) |
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 #643D21 | 9.41:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #643D21 | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #643D21 text on white | 9.41:1 | AAA | Lc 91.6 | Preferred for body text |
| #643D21 text on black | 2.23:1 | Fails | Lc -10.8 | 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 900.
-
Step 50
50
#F9F4F1
oklch(97% 0.007 53.4)
-
Step 100
100
#F2E7E1
oklch(93.5% 0.014 50.8)
-
Step 200
200
#E9D5C8
oklch(88.6% 0.028 55.3)
-
Step 300
300
#DCB9A1
oklch(81% 0.052 56.3)
-
Step 400
400
#C9936F
oklch(70.7% 0.082 54.7)
-
Step 500
500
#BA7747
oklch(63% 0.106 55.1)
-
Step 600
600
#A65F28
oklch(55.7% 0.115 55)
-
Step 700
700
#8E4E1A
oklch(49.2% 0.107 55.1)
-
Step 800
800
#734019
oklch(42.6% 0.088 54.7)
-
Step 900
900 (this color)
#643D21
oklch(40% 0.069 55)
-
Step 950
950
#372011
oklch(27% 0.044 53)
#643D21 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) | #48411E | 0.054 |
| Deuteranopia (no green cones) | #524A21 | 0.049 |
| Tritanopia (no blue cones) | #6D3536 | 0.046 |
| Achromatopsia (no color) | #464646 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D21
#643D21
oklch(40% 0.069 55)
- #1B4D67
#1B4D67
oklch(39.9% 0.068 235)
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 #643D21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.036
- Purple Brown #673A3F ΔE 0.048
- Chestnut #742802 ΔE 0.053
- Green Brown #544E03 ΔE 0.069
- Milk Chocolate #7F4E1E ΔE 0.075
- Brownish Purple #76424E ΔE 0.075
- Olive Brown #645403 ΔE 0.077
- Rust Brown #8B3103 ΔE 0.078
Use #643D21 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.