#645B3F
Closest named color: Mud (#735C12). oklch(47.2% 0.044 92.4), rgb(100, 91, 63).
Aa
White text reads best on this color (6.75:1).
About this color
#645B3F is a medium-dark, muted brown. In OKLCH its lightness is 47%, its chroma 0.044 and its hue 92°. Its hue sits on the warm side of the wheel. The nearest named color is Mud (#735C12), ΔE 0.050 away. White text reads best on it, at 6.75:1.
| Hue family | Browns |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.044) |
| Temperature | warm |
| Nearest name | Mud (#735C12) |
| Black text | 3.11:1 |
| White text | 6.75:1 |
Values
| HEX | #645B3F |
| RGB | rgb(100, 91, 63) |
| HSL | hsl(45, 23%, 32%) |
| OKLCH | oklch(47.2% 0.044 92.4) |
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 #645B3F | 6.75:1 | AA | Lc -88.3 | Fine for body text |
| Black text on #645B3F | 3.11:1 | AA large text | Lc 20.8 | Dividers and decoration only |
| #645B3F text on white | 6.75:1 | AA | Lc 83.3 | Fine for body text |
| #645B3F text on black | 3.11:1 | AA large text | Lc -18.7 | 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
#EBEAE5
oklch(93.6% 0.007 97.4)
-
Step 200
200
#DCD9D1
oklch(88.5% 0.011 89.7)
-
Step 300
300
#C5C0B2
oklch(80.8% 0.02 90.6)
-
Step 400
400
#A8A089
oklch(70.6% 0.034 91.1)
-
Step 500
500
#93896C
oklch(63.1% 0.043 91.3)
-
Step 600
600
#7D7354
oklch(55.6% 0.047 92.3)
-
Step 700
700 (this color)
#645B3F
oklch(47.2% 0.044 92.4)
-
Step 800
800
#564F38
oklch(42.8% 0.037 93.2)
-
Step 900
900
#474131
oklch(37.6% 0.027 89.9)
-
Step 950
950
#29261D
oklch(26.9% 0.017 91.8)
#645B3F 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) | #615A3D | 0.007 |
| Deuteranopia (no green cones) | #635D40 | 0.006 |
| Tritanopia (no blue cones) | #6A5754 | 0.040 |
| Achromatopsia (no color) | #5B5B5B | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645B3F
#645B3F
oklch(47.2% 0.044 92.4)
- #535A74
#535A74
oklch(47.2% 0.043 272.9)
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 #645B3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud #735C12 ΔE 0.050
- Olive Brown #645403 ΔE 0.053
- Dark Moss Green #606C38 ΔE 0.056
- Milk Chocolate #7F4E1E ΔE 0.058
- Greeny Brown #696006 ΔE 0.058
- Medium Brown #7F5112 ΔE 0.059
- Camo Green #526525 ΔE 0.060
- Dark Olive Green #556B2F ΔE 0.063
Use #645B3F 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.