#645F33
Closest named color: Mud (#735C12). oklch(47.9% 0.063 102.8), rgb(100, 95, 51).
Aa
White text reads best on this color (6.50:1).
About this color
#645F33 is a medium-dark, muted brown. In OKLCH its lightness is 48%, its chroma 0.063 and its hue 103°. Its hue sits on the warm side of the wheel. The nearest named color is Mud (#735C12), ΔE 0.033 away. White text reads best on it, at 6.50:1.
| Hue family | Browns |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.063) |
| Temperature | warm |
| Nearest name | Mud (#735C12) |
| Black text | 3.22:1 |
| White text | 6.50:1 |
Values
| HEX | #645F33 |
| RGB | rgb(100, 95, 51) |
| HSL | hsl(54, 32%, 30%) |
| OKLCH | oklch(47.9% 0.063 102.8) |
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 #645F33 | 6.50:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #645F33 | 3.22:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #645F33 text on white | 6.50:1 | AA | Lc 82.2 | Fine for body text |
| #645F33 text on black | 3.22:1 | AA large text | Lc -19.7 | 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
#F6F6F2
oklch(97.2% 0.005 106.5)
-
Step 100
100
#EBEAE3
oklch(93.6% 0.009 100)
-
Step 200
200
#DBDACD
oklch(88.6% 0.018 103.2)
-
Step 300
300
#C4C2AB
oklch(80.9% 0.032 103)
-
Step 400
400
#A6A27F
oklch(70.6% 0.049 102.1)
-
Step 500
500
#908B5F
oklch(63% 0.062 102.5)
-
Step 600
600
#7B7545
oklch(55.6% 0.068 102.1)
-
Step 700
700 (this color)
#645F33
oklch(47.9% 0.063 102.8)
-
Step 800
800
#54502D
oklch(42.6% 0.053 102.7)
-
Step 900
900
#454329
oklch(37.8% 0.041 104.4)
-
Step 950
950
#292718
oklch(27% 0.026 101.5)
#645F33 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) | #665C2F | 0.009 |
| Deuteranopia (no green cones) | #685F35 | 0.007 |
| Tritanopia (no blue cones) | #6A5A55 | 0.058 |
| Achromatopsia (no color) | #5E5E5E | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645F33
#645F33
oklch(47.9% 0.063 102.8)
- #585980
#585980
oklch(47.9% 0.063 282.6)
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 #645F33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud #735C12 ΔE 0.033
- Greeny Brown #696006 ΔE 0.036
- Dark Moss Green #606C38 ΔE 0.038
- Camo Green #526525 ΔE 0.040
- Olive Brown #645403 ΔE 0.042
- Dark Olive Green #556B2F ΔE 0.043
- Mud Green #606602 ΔE 0.049
- Army Green #4B5D16 ΔE 0.053
Use #645F33 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.