#645F39
Closest named color: Mud (#735C12). oklch(48% 0.056 101.7), rgb(100, 95, 57).
Aa
White text reads best on this color (6.48:1).
About this color
#645F39 is a medium-dark, muted brown. In OKLCH its lightness is 48%, its chroma 0.056 and its hue 102°. Its hue sits on the warm side of the wheel. The nearest named color is Mud (#735C12), ΔE 0.039 away. White text reads best on it, at 6.48:1.
| Hue family | Browns |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.056) |
| Temperature | warm |
| Nearest name | Mud (#735C12) |
| Black text | 3.23:1 |
| White text | 6.48:1 |
Values
| HEX | #645F39 |
| RGB | rgb(100, 95, 57) |
| HSL | hsl(53, 27%, 31%) |
| OKLCH | oklch(48% 0.056 101.7) |
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 #645F39 | 6.48:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #645F39 | 3.23:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #645F39 text on white | 6.48:1 | AA | Lc 82.2 | Fine for body text |
| #645F39 text on black | 3.23:1 | 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
#F6F5F3
oklch(97% 0.003 84.6)
-
Step 100
100
#EBEAE4
oklch(93.6% 0.008 98.9)
-
Step 200
200
#DBDACE
oklch(88.6% 0.016 102.9)
-
Step 300
300
#C4C2AE
oklch(81% 0.027 102.3)
-
Step 400
400
#A6A283
oklch(70.7% 0.043 101.3)
-
Step 500
500
#908B64
oklch(63.1% 0.055 101.7)
-
Step 600
600
#7A754B
oklch(55.6% 0.06 102.3)
-
Step 700
700 (this color)
#645F39
oklch(48% 0.056 101.7)
-
Step 800
800
#545032
oklch(42.7% 0.046 101.6)
-
Step 900
900
#45422C
oklch(37.6% 0.035 101.3)
-
Step 950
950
#29271A
oklch(27.1% 0.023 100.4)
#645F39 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) | #655D36 | 0.006 |
| Deuteranopia (no green cones) | #675F3B | 0.006 |
| Tritanopia (no blue cones) | #6A5A56 | 0.052 |
| Achromatopsia (no color) | #5E5E5E | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645F39
#645F39
oklch(48% 0.056 101.7)
- #585A7D
#585A7D
oklch(48% 0.056 281.5)
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 #645F39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud #735C12 ΔE 0.039
- Dark Moss Green #606C38 ΔE 0.040
- Greeny Brown #696006 ΔE 0.043
- Camo Green #526525 ΔE 0.046
- Dark Olive Green #556B2F ΔE 0.048
- Olive Brown #645403 ΔE 0.048
- Mud Green #606602 ΔE 0.056
- Dirt Brown #836539 ΔE 0.057
Use #645F39 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.