#643604
Closest named color: Chestnut (#742802). oklch(38.3% 0.087 60), rgb(100, 54, 4).
Aa
White text reads best on this color (10.13:1).
About this color
#643604 is a dark, moderately saturated brown. In OKLCH its lightness is 38%, its chroma 0.087 and its hue 60°. Its hue sits on the warm side of the wheel. The nearest named color is Chestnut (#742802), ΔE 0.043 away. White text reads best on it, at 10.13:1.
| Hue family | Browns |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.087) |
| Temperature | warm |
| Nearest name | Chestnut (#742802) |
| Black text | 2.07:1 |
| White text | 10.13:1 |
Values
| HEX | #643604 |
| RGB | rgb(100, 54, 4) |
| HSL | hsl(31, 92%, 20%) |
| OKLCH | oklch(38.3% 0.087 60) |
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 #643604 | 10.13:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #643604 | 2.07:1 | Fails | Lc 10.8 | Not readable |
| #643604 text on white | 10.13:1 | AAA | Lc 93.2 | Preferred for body text |
| #643604 text on black | 2.07:1 | Fails | Lc -9.3 | 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 900.
-
Step 50
50
#FAF4F0
oklch(97.1% 0.008 56.3)
-
Step 100
100
#F4E7DE
oklch(93.6% 0.019 57.2)
-
Step 200
200
#ECD4C2
oklch(88.5% 0.036 59.2)
-
Step 300
300
#E1B797
oklch(80.9% 0.065 59)
-
Step 400
400
#D0915B
oklch(70.7% 0.104 60.5)
-
Step 500
500
#C37324
oklch(63.1% 0.134 59.9)
-
Step 600
600
#A95D00
oklch(55.5% 0.13 59.8)
-
Step 700
700
#8F4E00
oklch(49.2% 0.115 60)
-
Step 800
800
#763F00
oklch(42.7% 0.101 59.7)
-
Step 900
900 (this color)
#643604
oklch(38.3% 0.087 60)
-
Step 950
950
#3A1F06
oklch(27% 0.056 59.6)
#643604 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) | #443B00 | 0.064 |
| Deuteranopia (no green cones) | #4F4604 | 0.059 |
| Tritanopia (no blue cones) | #6E2B2D | 0.062 |
| Achromatopsia (no color) | #414141 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643604
#643604
oklch(38.3% 0.087 60)
- #01486D
#01486D
oklch(38.3% 0.088 240.4)
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 #643604, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chestnut #742802 ΔE 0.043
- Mud Brown #60460F ΔE 0.043
- Purple Brown #673A3F ΔE 0.067
- Green Brown #544E03 ΔE 0.074
- Reddy Brown #6E1005 ΔE 0.076
- Rust Brown #8B3103 ΔE 0.080
- Red Brown #8B2E16 ΔE 0.083
- Olive Brown #645403 ΔE 0.086
Use #643604 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.