#643503
Closest named color: Chestnut (#742802). oklch(38.1% 0.088 59.2), rgb(100, 53, 3).
Aa
White text reads best on this color (10.23:1).
About this color
#643503 is a dark, moderately saturated brown. In OKLCH its lightness is 38%, its chroma 0.088 and its hue 59°. Its hue sits on the warm side of the wheel. The nearest named color is Chestnut (#742802), ΔE 0.042 away. White text reads best on it, at 10.23:1.
| Hue family | Browns |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.088) |
| Temperature | warm |
| Nearest name | Chestnut (#742802) |
| Black text | 2.05:1 |
| White text | 10.23:1 |
Values
| HEX | #643503 |
| RGB | rgb(100, 53, 3) |
| HSL | hsl(31, 94%, 20%) |
| OKLCH | oklch(38.1% 0.088 59.2) |
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 #643503 | 10.23:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #643503 | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #643503 text on white | 10.23:1 | AAA | Lc 93.4 | Preferred for body text |
| #643503 text on black | 2.05:1 | Fails | Lc -9.1 | 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
#E1B796
oklch(80.9% 0.066 59.8)
-
Step 400
400
#D1905B
oklch(70.7% 0.105 59.1)
-
Step 500
500
#C47223
oklch(63% 0.135 59)
-
Step 600
600
#AA5D00
oklch(55.7% 0.131 59.4)
-
Step 700
700
#8F4D00
oklch(49% 0.116 59.2)
-
Step 800
800
#763F00
oklch(42.7% 0.101 59.7)
-
Step 900
900 (this color)
#643503
oklch(38.1% 0.088 59.2)
-
Step 950
950
#3A1F06
oklch(27% 0.056 59.6)
#643503 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) | #433A00 | 0.066 |
| Deuteranopia (no green cones) | #4F4503 | 0.059 |
| Tritanopia (no blue cones) | #6E2A2C | 0.061 |
| Achromatopsia (no color) | #414141 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643503
#643503
oklch(38.1% 0.088 59.2)
- #00486B
#00486B
oklch(38.2% 0.086 238.7)
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 #643503, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chestnut #742802 ΔE 0.042
- Mud Brown #60460F ΔE 0.046
- Purple Brown #673A3F ΔE 0.068
- Reddy Brown #6E1005 ΔE 0.074
- Green Brown #544E03 ΔE 0.076
- Rust Brown #8B3103 ΔE 0.080
- Red Brown #8B2E16 ΔE 0.083
- Blood #770001 ΔE 0.087
Use #643503 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.