#637D73
Closest named color: Battleship Grey (#6B7C85). oklch(56.6% 0.034 169.7), rgb(99, 125, 115).
Aa
Black text reads best on this color (4.71:1).
About this color
#637D73 is a medium-dark, muted green. In OKLCH its lightness is 57%, its chroma 0.034 and its hue 170°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Battleship Grey (#6B7C85), ΔE 0.032 away. Black text reads best on it, at 4.71:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.034) |
| Temperature | in between |
| Nearest name | Battleship Grey (#6B7C85) |
| Black text | 4.71:1 |
| White text | 4.45:1 |
Values
| HEX | #637D73 |
| RGB | rgb(99, 125, 115) |
| HSL | hsl(157, 12%, 44%) |
| OKLCH | oklch(56.6% 0.034 169.7) |
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 #637D73 | 4.45:1 | AA large text | Lc -76.4 | Fine for body text |
| Black text on #637D73 | 4.71:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #637D73 text on white | 4.45:1 | AA large text | Lc 70.9 | Content text, not long reading |
| #637D73 text on black | 4.71:1 | AA | Lc -30.7 | 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
#B8C4BF
oklch(81% 0.015 169.1)
-
Step 400
400
#92A69E
oklch(70.7% 0.025 169.6)
-
Step 500
500
#789086
oklch(63.2% 0.031 168.2)
-
Step 600
600 (this color)
#637D73
oklch(56.6% 0.034 169.7)
-
Step 700
700
#4F675E
oklch(49.2% 0.032 170)
-
Step 800
800
#41544D
oklch(42.8% 0.026 170.6)
-
Step 900
900
#374540
oklch(37.6% 0.02 171.5)
-
Step 950
950
#202925
oklch(27.1% 0.015 166.5)
#637D73 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) | #7B7973 | 0.035 |
| Deuteranopia (no green cones) | #777674 | 0.034 |
| Tritanopia (no blue cones) | #5D7D7A | 0.012 |
| Achromatopsia (no color) | #777777 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637D73
#637D73
oklch(56.6% 0.034 169.7)
- #866E79
#866E79
oklch(56.5% 0.034 348.9)
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 #637D73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Grey #6B7C85 ΔE 0.032
- Battleship Gray #6C757D ΔE 0.035
- Steel Grey #6F828A ΔE 0.040
- Medium Grey #7D7F7C ΔE 0.041
- Grey Blue #647D8E ΔE 0.042
- Gray #808080 ΔE 0.048
- Slate Gray #708090 ΔE 0.049
- Slate Green #658D6D ΔE 0.052
Use #637D73 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.