#637979
Closest named color: Battleship Gray (#6C757D). oklch(55.9% 0.026 196.4), rgb(99, 121, 121).
Aa
White text reads best on this color (4.62:1).
About this color
#637979 is a medium-dark close to neutral grey. In OKLCH its lightness is 56%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Battleship Gray (#6C757D), ΔE 0.019 away. White text reads best on it, at 4.62:1.
| Hue family | Neutrals |
| Lightness | medium-dark (56%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.54:1 |
| White text | 4.62:1 |
Values
| HEX | #637979 |
| RGB | rgb(99, 121, 121) |
| HSL | hsl(180, 10%, 43%) |
| OKLCH | oklch(55.9% 0.026 196.4) |
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 #637979 | 4.62:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #637979 | 4.54:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #637979 text on white | 4.62:1 | AA | Lc 72.1 | Content text, not long reading |
| #637979 text on black | 4.54:1 | AA | Lc -29.6 | 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
#E7EAEA
oklch(93.5% 0.003 197.1)
-
Step 200
200
#D4DADA
oklch(88.4% 0.007 197)
-
Step 300
300
#B8C3C3
oklch(80.9% 0.012 196.9)
-
Step 400
400
#94A4A4
oklch(70.6% 0.018 196.8)
-
Step 500
500
#7A8E8E
oklch(63.1% 0.023 196.6)
-
Step 600
600 (this color)
#637979
oklch(55.9% 0.026 196.4)
-
Step 700
700
#516565
oklch(49% 0.024 196.4)
-
Step 800
800
#435353
oklch(42.9% 0.02 196.4)
-
Step 900
900
#384444
oklch(37.6% 0.016 196.5)
-
Step 950
950
#212828
oklch(27% 0.01 196.6)
#637979 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) | #767779 | 0.027 |
| Deuteranopia (no green cones) | #727379 | 0.026 |
| Tritanopia (no blue cones) | #5C7B79 | 0.010 |
| Achromatopsia (no color) | #757575 | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637979
#637979
oklch(55.9% 0.026 196.4)
- #836E6F
#836E6F
oklch(55.9% 0.027 14.7)
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 #637979, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.019
- Battleship Grey #6B7C85 ΔE 0.023
- Grey Blue #647D8E ΔE 0.032
- Steel Grey #6F828A ΔE 0.038
- Slate Gray #708090 ΔE 0.042
- Medium Grey #7D7F7C ΔE 0.043
- Dim Gray #696969 ΔE 0.046
- Gray #808080 ΔE 0.049
Use #637979 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.