#637F74
Closest named color: Battleship Grey (#6B7C85). oklch(57.1% 0.036 169.1), rgb(99, 127, 116).
Aa
Black text reads best on this color (4.81:1).
About this color
#637F74 is a medium-dark, muted green. In OKLCH its lightness is 57%, its chroma 0.036 and its hue 169°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Battleship Grey (#6B7C85), ΔE 0.033 away. Black text reads best on it, at 4.81:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.036) |
| Temperature | in between |
| Nearest name | Battleship Grey (#6B7C85) |
| Black text | 4.81:1 |
| White text | 4.35:1 |
Values
| HEX | #637F74 |
| RGB | rgb(99, 127, 116) |
| HSL | hsl(156, 12%, 44%) |
| OKLCH | oklch(57.1% 0.036 169.1) |
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 #637F74 | 4.35:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #637F74 | 4.81:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #637F74 text on white | 4.35:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #637F74 text on black | 4.81:1 | AA | Lc -31.5 | Non-text elements, placeholder text |
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
#E7EBE9
oklch(93.6% 0.005 165)
-
Step 200
200
#D4DBD8
oklch(88.5% 0.009 168.7)
-
Step 300
300
#B7C4BF
oklch(80.9% 0.016 170.9)
-
Step 400
400
#91A69E
oklch(70.6% 0.026 170.6)
-
Step 500
500
#769086
oklch(63% 0.033 169.9)
-
Step 600
600 (this color)
#637F74
oklch(57.1% 0.036 169.1)
-
Step 700
700
#4E675D
oklch(49% 0.034 168.5)
-
Step 800
800
#40544C
oklch(42.6% 0.028 168.6)
-
Step 900
900
#364540
oklch(37.6% 0.021 172.8)
-
Step 950
950
#202925
oklch(27.1% 0.015 166.5)
#637F74 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) | #7D7B73 | 0.037 |
| Deuteranopia (no green cones) | #787775 | 0.036 |
| Tritanopia (no blue cones) | #5D7F7C | 0.014 |
| Achromatopsia (no color) | #797979 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637F74
#637F74
oklch(57.1% 0.036 169.1)
- #896F7B
#896F7B
oklch(57.1% 0.037 348.9)
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 #637F74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Grey #6B7C85 ΔE 0.033
- Steel Grey #6F828A ΔE 0.038
- Battleship Gray #6C757D ΔE 0.039
- Medium Grey #7D7F7C ΔE 0.039
- Grey Blue #647D8E ΔE 0.043
- Gray #808080 ΔE 0.046
- Slate Green #658D6D ΔE 0.047
- Slate Gray #708090 ΔE 0.048
Use #637F74 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.