#645F55
Closest named color: Dim Gray (#696969). oklch(48.7% 0.017 84.6), rgb(100, 95, 85).
Aa
White text reads best on this color (6.34:1).
About this color
#645F55 is a medium-dark close to neutral grey. In OKLCH its lightness is 49%, its chroma 0.017. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.038 away. White text reads best on it, at 6.34:1.
| Hue family | Neutrals |
| Lightness | medium-dark (49%) |
| Chroma | close to neutral grey (0.017) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.30:1 |
| White text | 6.34:1 |
Values
| HEX | #645F55 |
| RGB | rgb(100, 95, 85) |
| HSL | hsl(40, 8%, 36%) |
| OKLCH | oklch(48.7% 0.017 84.6) |
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 #645F55 | 6.34:1 | AA | Lc -86.7 | Fine for body text |
| Black text on #645F55 | 3.30:1 | AA large text | Lc 22.5 | Dividers and decoration only |
| #645F55 text on white | 6.34:1 | AA | Lc 81.6 | Fine for body text |
| #645F55 text on black | 3.30:1 | AA large text | Lc -20.3 | 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
#EAEAE8
oklch(93.6% 0.003 106.5)
-
Step 200
200
#DAD9D6
oklch(88.5% 0.004 91.5)
-
Step 300
300
#C3C0BB
oklch(80.9% 0.008 80.7)
-
Step 400
400
#A4A098
oklch(70.7% 0.012 84.6)
-
Step 500
500
#8E897E
oklch(63.1% 0.017 86.5)
-
Step 600
600
#787368
oklch(55.7% 0.018 86.5)
-
Step 700
700 (this color)
#645F55
oklch(48.7% 0.017 84.6)
-
Step 800
800
#524E46
oklch(42.5% 0.014 84.6)
-
Step 900
900
#44413B
oklch(37.6% 0.011 84.6)
-
Step 950
950
#282623
oklch(27% 0.006 78.2)
#645F55 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) | #625F54 | 0.004 |
| Deuteranopia (no green cones) | #636055 | 0.003 |
| Tritanopia (no blue cones) | #675D5C | 0.015 |
| Achromatopsia (no color) | #5F5F5F | 0.017 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645F55
#645F55
oklch(48.7% 0.017 84.6)
- #5B6069
#5B6069
oklch(48.8% 0.016 262.3)
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 #645F55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.038
- Slate #516572 ΔE 0.048
- Dark Taupe #7F684E ΔE 0.056
- Cocoa #875F42 ΔE 0.063
- Dark Moss Green #606C38 ΔE 0.067
- Dirt Brown #836539 ΔE 0.068
- Dusty Grape #545775 ΔE 0.068
- Grey Brown #7F7053 ΔE 0.071
Use #645F55 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.