#645E55
Closest named color: Dim Gray (#696969). oklch(48.5% 0.016 78.2), rgb(100, 94, 85).
Aa
White text reads best on this color (6.41:1).
About this color
#645E55 is a medium-dark close to neutral grey. In OKLCH its lightness is 48%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.039 away. White text reads best on it, at 6.41:1.
| Hue family | Neutrals |
| Lightness | medium-dark (48%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.27:1 |
| White text | 6.41:1 |
Values
| HEX | #645E55 |
| RGB | rgb(100, 94, 85) |
| HSL | hsl(36, 8%, 36%) |
| OKLCH | oklch(48.5% 0.016 78.2) |
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 #645E55 | 6.41:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #645E55 | 3.27:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #645E55 text on white | 6.41:1 | AA | Lc 81.9 | Fine for body text |
| #645E55 text on black | 3.27:1 | AA large text | Lc -20.0 | 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
#F6F5F5
oklch(97.1% 0.001 17.2)
-
Step 100
100
#EBEAE8
oklch(93.7% 0.003 84.6)
-
Step 200
200
#DBD9D6
oklch(88.6% 0.005 78.3)
-
Step 300
300
#C3C0BB
oklch(80.9% 0.008 80.7)
-
Step 400
400
#A5A098
oklch(70.8% 0.013 79.8)
-
Step 500
500
#8F887F
oklch(63% 0.016 74.3)
-
Step 600
600
#797268
oklch(55.5% 0.017 77)
-
Step 700
700 (this color)
#645E55
oklch(48.5% 0.016 78.2)
-
Step 800
800
#534E47
oklch(42.6% 0.013 76.5)
-
Step 900
900
#45413C
oklch(37.8% 0.01 73.6)
-
Step 950
950
#282623
oklch(27% 0.006 78.2)
#645E55 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) | #615E54 | 0.005 |
| Deuteranopia (no green cones) | #625F55 | 0.004 |
| Tritanopia (no blue cones) | #675C5B | 0.014 |
| Achromatopsia (no color) | #5F5F5F | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645E55
#645E55
oklch(48.5% 0.016 78.2)
- #595F68
#595F68
oklch(48.3% 0.016 258.4)
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 #645E55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.039
- Slate #516572 ΔE 0.048
- Dark Taupe #7F684E ΔE 0.058
- Cocoa #875F42 ΔE 0.064
- Dusty Grape #545775 ΔE 0.067
- Dark Moss Green #606C38 ΔE 0.069
- Dirt Brown #836539 ΔE 0.070
- Grey Brown #7F7053 ΔE 0.073
Use #645E55 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.