#645B44
Closest named color: Mud (#735C12). oklch(47.3% 0.037 89.2), rgb(100, 91, 68).
Aa
White text reads best on this color (6.72:1).
About this color
#645B44 is a medium-dark, muted brown. In OKLCH its lightness is 47%, its chroma 0.037 and its hue 89°. Its hue sits on the warm side of the wheel. The nearest named color is Mud (#735C12), ΔE 0.056 away. White text reads best on it, at 6.72:1.
| Hue family | Browns |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.037) |
| Temperature | warm |
| Nearest name | Mud (#735C12) |
| Black text | 3.12:1 |
| White text | 6.72:1 |
Values
| HEX | #645B44 |
| RGB | rgb(100, 91, 68) |
| HSL | hsl(43, 19%, 33%) |
| OKLCH | oklch(47.3% 0.037 89.2) |
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 #645B44 | 6.72:1 | AA | Lc -88.2 | Fine for body text |
| Black text on #645B44 | 3.12:1 | AA large text | Lc 20.9 | Dividers and decoration only |
| #645B44 text on white | 6.72:1 | AA | Lc 83.2 | Fine for body text |
| #645B44 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
#F6F5F4
oklch(97.1% 0.002 67.8)
-
Step 100
100
#EBEAE6
oklch(93.7% 0.005 95.1)
-
Step 200
200
#DCD9D2
oklch(88.6% 0.01 87.5)
-
Step 300
300
#C5C0B4
oklch(80.8% 0.017 88)
-
Step 400
400
#A8A08D
oklch(70.7% 0.028 87.9)
-
Step 500
500
#928971
oklch(63.1% 0.036 89.9)
-
Step 600
600
#7D7359
oklch(55.8% 0.04 89.5)
-
Step 700
700 (this color)
#645B44
oklch(47.3% 0.037 89.2)
-
Step 800
800
#564E3C
oklch(42.6% 0.03 86.8)
-
Step 900
900
#474133
oklch(37.7% 0.024 87.6)
-
Step 950
950
#29261E
oklch(26.9% 0.015 89.9)
#645B44 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) | #605A42 | 0.008 |
| Deuteranopia (no green cones) | #635D45 | 0.006 |
| Tritanopia (no blue cones) | #695755 | 0.034 |
| Achromatopsia (no color) | #5C5C5C | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645B44
#645B44
oklch(47.3% 0.037 89.2)
- #535B71
#535B71
oklch(47.3% 0.037 269.3)
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 #645B44, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud #735C12 ΔE 0.056
- Dark Moss Green #606C38 ΔE 0.060
- Olive Brown #645403 ΔE 0.060
- Dim Gray #696969 ΔE 0.060
- Milk Chocolate #7F4E1E ΔE 0.060
- Dark Taupe #7F684E ΔE 0.062
- Medium Brown #7F5112 ΔE 0.063
- Cocoa #875F42 ΔE 0.063
Use #645B44 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.