#637481
Closest named color: Battleship Gray (#6C757D). oklch(55% 0.029 241), rgb(99, 116, 129).
Aa
White text reads best on this color (4.83:1).
About this color
#637481 is a medium-dark close to neutral grey. In OKLCH its lightness is 55%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Battleship Gray (#6C757D), ΔE 0.015 away. White text reads best on it, at 4.83:1.
| Hue family | Neutrals |
| Lightness | medium-dark (55%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.34:1 |
| White text | 4.83:1 |
Values
| HEX | #637481 |
| RGB | rgb(99, 116, 129) |
| HSL | hsl(206, 13%, 45%) |
| OKLCH | oklch(55% 0.029 241) |
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 #637481 | 4.83:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #637481 | 4.34:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #637481 text on white | 4.83:1 | AA | Lc 73.5 | Content text, not long reading |
| #637481 text on black | 4.34:1 | AA large text | Lc -28.2 | 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
#F4F5F6
oklch(97% 0.002 247.8)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D5DADD
oklch(88.5% 0.007 233.7)
-
Step 300
300
#BAC2C8
oklch(81% 0.012 239.9)
-
Step 400
400
#96A3AD
oklch(70.8% 0.021 240.9)
-
Step 500
500
#7C8C98
oklch(63.1% 0.026 240.3)
-
Step 600
600 (this color)
#637481
oklch(55% 0.029 241)
-
Step 700
700
#54636F
oklch(49.2% 0.027 242.3)
-
Step 800
800
#44515A
oklch(42.7% 0.022 238.3)
-
Step 900
900
#3A434A
oklch(37.7% 0.017 241.4)
-
Step 950
950
#22272B
oklch(26.9% 0.01 242.1)
#637481 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) | #6F7482 | 0.017 |
| Deuteranopia (no green cones) | #6B7081 | 0.015 |
| Tritanopia (no blue cones) | #5B7778 | 0.022 |
| Achromatopsia (no color) | #727272 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637481
#637481
oklch(55% 0.029 241)
- #7E6E61
#7E6E61
oklch(54.9% 0.028 61.3)
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 #637481, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.015
- Battleship Grey #6B7C85 ΔE 0.027
- Grey Blue #647D8E ΔE 0.029
- Metallic Blue #4F738E ΔE 0.032
- Dim Gray #696969 ΔE 0.041
- Slate Gray #708090 ΔE 0.043
- Stormy Blue #507B9C ΔE 0.044
- Steel Grey #6F828A ΔE 0.045
Use #637481 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.