#637780
Closest named color: Battleship Gray (#6C757D). oklch(55.6% 0.027 226.9), rgb(99, 119, 128).
Aa
White text reads best on this color (4.68:1).
About this color
#637780 is a medium-dark close to neutral grey. In OKLCH its lightness is 56%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Battleship Gray (#6C757D), ΔE 0.013 away. White text reads best on it, at 4.68:1.
| Hue family | Neutrals |
| Lightness | medium-dark (56%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.48:1 |
| White text | 4.68:1 |
Values
| HEX | #637780 |
| RGB | rgb(99, 119, 128) |
| HSL | hsl(199, 13%, 45%) |
| OKLCH | oklch(55.6% 0.027 226.9) |
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 #637780 | 4.68:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #637780 | 4.48:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #637780 text on white | 4.68:1 | AA | Lc 72.6 | Content text, not long reading |
| #637780 text on black | 4.48:1 | AA large text | Lc -29.1 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D5DADD
oklch(88.5% 0.007 233.7)
-
Step 300
300
#B9C2C7
oklch(80.9% 0.012 231.7)
-
Step 400
400
#94A3AA
oklch(70.6% 0.02 227.4)
-
Step 500
500
#7A8D95
oklch(63.1% 0.025 225.1)
-
Step 600
600 (this color)
#637780
oklch(55.6% 0.027 226.9)
-
Step 700
700
#52646C
oklch(49.1% 0.025 226.6)
-
Step 800
800
#435258
oklch(42.8% 0.021 224)
-
Step 900
900
#394448
oklch(37.8% 0.016 221.8)
-
Step 950
950
#21282A
oklch(27.1% 0.011 216.9)
#637780 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) | #727681 | 0.021 |
| Deuteranopia (no green cones) | #6E7280 | 0.020 |
| Tritanopia (no blue cones) | #5B7A7A | 0.018 |
| Achromatopsia (no color) | #747474 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637780
#637780
oklch(55.6% 0.027 226.9)
- #826F66
#826F66
oklch(55.7% 0.028 46.9)
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 #637780, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.013
- Battleship Grey #6B7C85 ΔE 0.020
- Grey Blue #647D8E ΔE 0.024
- Metallic Blue #4F738E ΔE 0.037
- Steel Grey #6F828A ΔE 0.038
- Slate Gray #708090 ΔE 0.038
- Dim Gray #696969 ΔE 0.045
- Stormy Blue #507B9C ΔE 0.045
Use #637780 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.