#645C33
Closest named color: Mud (#735C12). oklch(47.2% 0.06 98.5), rgb(100, 92, 51).
Aa
White text reads best on this color (6.72:1).
About this color
#645C33 is a medium-dark, muted brown. In OKLCH its lightness is 47%, its chroma 0.060 and its hue 99°. Its hue sits on the warm side of the wheel. The nearest named color is Mud (#735C12), ΔE 0.036 away. White text reads best on it, at 6.72:1.
| Hue family | Browns |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.060) |
| Temperature | warm |
| Nearest name | Mud (#735C12) |
| Black text | 3.12:1 |
| White text | 6.72:1 |
Values
| HEX | #645C33 |
| RGB | rgb(100, 92, 51) |
| HSL | hsl(50, 32%, 30%) |
| OKLCH | oklch(47.2% 0.06 98.5) |
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 #645C33 | 6.72:1 | AA | Lc -88.2 | Fine for body text |
| Black text on #645C33 | 3.12:1 | AA large text | Lc 20.9 | Dividers and decoration only |
| #645C33 text on white | 6.72:1 | AA | Lc 83.2 | Fine for body text |
| #645C33 text on black | 3.12:1 | AA large text | Lc -18.8 | 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 700.
-
Step 50
50
#F6F5F3
oklch(97% 0.003 84.6)
-
Step 100
100
#EBEAE4
oklch(93.6% 0.008 98.9)
-
Step 200
200
#DCD9CE
oklch(88.5% 0.015 94.2)
-
Step 300
300
#C5C1AC
oklch(80.8% 0.029 98.1)
-
Step 400
400
#A8A180
oklch(70.6% 0.047 97.4)
-
Step 500
500
#928A60
oklch(63% 0.059 98.7)
-
Step 600
600
#7D7447
oklch(55.6% 0.064 98.3)
-
Step 700
700 (this color)
#645C33
oklch(47.2% 0.06 98.5)
-
Step 800
800
#564F2F
oklch(42.6% 0.049 97.3)
-
Step 900
900
#47422A
oklch(37.7% 0.038 97.8)
-
Step 950
950
#292719
oklch(27% 0.024 101)
#645C33 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) | #635A30 | 0.006 |
| Deuteranopia (no green cones) | #655D35 | 0.004 |
| Tritanopia (no blue cones) | #6B5752 | 0.054 |
| Achromatopsia (no color) | #5C5C5C | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645C33
#645C33
oklch(47.2% 0.06 98.5)
- #54587D
#54587D
oklch(47.2% 0.06 279.1)
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 #645C33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud #735C12 ΔE 0.036
- Olive Brown #645403 ΔE 0.039
- Greeny Brown #696006 ΔE 0.041
- Camo Green #526525 ΔE 0.046
- Dark Moss Green #606C38 ΔE 0.047
- Dark Olive Green #556B2F ΔE 0.051
- Medium Brown #7F5112 ΔE 0.053
- Army Green #4B5D16 ΔE 0.054
Use #645C33 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.