#637568
Closest named color: Battleship Gray (#6C757D). oklch(54.4% 0.029 154), rgb(99, 117, 104).
Aa
White text reads best on this color (4.91:1).
About this color
#637568 is a medium-dark close to neutral grey. In OKLCH its lightness is 54%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Battleship Gray (#6C757D), ΔE 0.037 away. White text reads best on it, at 4.91:1.
| Hue family | Neutrals |
| Lightness | medium-dark (54%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.27:1 |
| White text | 4.91:1 |
Values
| HEX | #637568 |
| RGB | rgb(99, 117, 104) |
| HSL | hsl(137, 8%, 42%) |
| OKLCH | oklch(54.4% 0.029 154) |
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 #637568 | 4.91:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #637568 | 4.27:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #637568 text on white | 4.91:1 | AA | Lc 74.0 | Content text, not long reading |
| #637568 text on black | 4.27:1 | AA large text | Lc -27.7 | 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 600.
-
Step 50
50
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E8EAE9
oklch(93.5% 0.003 165.1)
-
Step 200
200
#D6DAD7
oklch(88.4% 0.006 153.8)
-
Step 300
300
#BAC3BD
oklch(80.8% 0.013 156.9)
-
Step 400
400
#97A59B
oklch(70.8% 0.021 154.7)
-
Step 500
500
#7D8F82
oklch(63.2% 0.028 154.1)
-
Step 600
600 (this color)
#637568
oklch(54.4% 0.029 154)
-
Step 700
700
#55655A
oklch(49% 0.026 155.3)
-
Step 800
800
#465349
oklch(42.8% 0.023 152.2)
-
Step 900
900
#3B443D
oklch(37.6% 0.017 152.1)
-
Step 950
950
#222824
oklch(26.9% 0.011 156.4)
#637568 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) | #757267 | 0.027 |
| Deuteranopia (no green cones) | #727069 | 0.026 |
| Tritanopia (no blue cones) | #617471 | 0.015 |
| Achromatopsia (no color) | #717171 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637568
#637568
oklch(54.4% 0.029 154)
- #7B6A77
#7B6A77
oklch(54.5% 0.029 334.1)
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 #637568, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.037
- Dim Gray #696969 ΔE 0.037
- Grey Brown #7F7053 ΔE 0.046
- Battleship Grey #6B7C85 ΔE 0.046
- Dark Taupe #7F684E ΔE 0.055
- Medium Grey #7D7F7C ΔE 0.056
- Grey Blue #647D8E ΔE 0.057
- Steel Grey #6F828A ΔE 0.060
Use #637568 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.