#645C55
Closest named color: Dim Gray (#696969). oklch(48% 0.015 63.7), rgb(100, 92, 85).
Aa
White text reads best on this color (6.55:1).
About this color
#645C55 is a medium-dark close to neutral grey. In OKLCH its lightness is 48%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.043 away. White text reads best on it, at 6.55:1.
| Hue family | Neutrals |
| Lightness | medium-dark (48%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.20:1 |
| White text | 6.55:1 |
Values
| HEX | #645C55 |
| RGB | rgb(100, 92, 85) |
| HSL | hsl(28, 8%, 36%) |
| OKLCH | oklch(48% 0.015 63.7) |
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 #645C55 | 6.55:1 | AA | Lc -87.5 | Fine for body text |
| Black text on #645C55 | 3.20:1 | AA large text | Lc 21.6 | Dividers and decoration only |
| #645C55 text on white | 6.55:1 | AA | Lc 82.5 | Fine for body text |
| #645C55 text on black | 3.20:1 | AA large text | Lc -19.4 | 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
#EBE9E8
oklch(93.5% 0.003 48.7)
-
Step 200
200
#DBD8D6
oklch(88.4% 0.004 56.4)
-
Step 300
300
#C4C0BC
oklch(81% 0.007 67.7)
-
Step 400
400
#A69F99
oklch(70.7% 0.012 63.3)
-
Step 500
500
#908880
oklch(63.1% 0.015 67.5)
-
Step 600
600
#7A716A
oklch(55.5% 0.016 60.4)
-
Step 700
700 (this color)
#645C55
oklch(48% 0.015 63.7)
-
Step 800
800
#544E48
oklch(42.8% 0.013 67.5)
-
Step 900
900
#45413C
oklch(37.8% 0.01 73.6)
-
Step 950
950
#292623
oklch(27.1% 0.007 67.5)
#645C55 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) | #5F5C55 | 0.008 |
| Deuteranopia (no green cones) | #605E55 | 0.008 |
| Tritanopia (no blue cones) | #675A5A | 0.013 |
| Achromatopsia (no color) | #5D5D5D | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645C55
#645C55
oklch(48% 0.015 63.7)
- #575F66
#575F66
oklch(48.1% 0.015 244.5)
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 #645C55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.043
- Slate #516572 ΔE 0.049
- Dark Taupe #7F684E ΔE 0.062
- Dusty Grape #545775 ΔE 0.063
- Cocoa #875F42 ΔE 0.066
- Dirt Brown #836539 ΔE 0.074
- YInMn Blue #415A77 ΔE 0.074
- Dark Moss Green #606C38 ΔE 0.074
Use #645C55 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.