#637566
Closest named color: Dim Gray (#696969). oklch(54.3% 0.031 150), rgb(99, 117, 102).
Aa
White text reads best on this color (4.92:1).
About this color
#637566 is a medium-dark, muted green. In OKLCH its lightness is 54%, its chroma 0.031 and its hue 150°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dim Gray (#696969), ΔE 0.039 away. White text reads best on it, at 4.92:1.
| Hue family | Greens |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.031) |
| Temperature | in between |
| Nearest name | Dim Gray (#696969) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #637566 |
| RGB | rgb(99, 117, 102) |
| HSL | hsl(130, 8%, 42%) |
| OKLCH | oklch(54.3% 0.031 150) |
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 #637566 | 4.92:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #637566 | 4.26:1 | AA large text | Lc 30.0 | Dividers and decoration only |
| #637566 text on white | 4.92:1 | AA | Lc 74.1 | Content text, not long reading |
| #637566 text on black | 4.26:1 | AA large text | Lc -27.6 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E8EBE8
oklch(93.7% 0.005 145.5)
-
Step 200
200
#D6DBD6
oklch(88.6% 0.009 145.5)
-
Step 300
300
#BAC3BC
oklch(80.8% 0.014 152.5)
-
Step 400
400
#97A599
oklch(70.7% 0.023 149.6)
-
Step 500
500
#7E8F80
oklch(63.2% 0.03 148.6)
-
Step 600
600 (this color)
#637566
oklch(54.3% 0.031 150)
-
Step 700
700
#556658
oklch(49.2% 0.03 150.3)
-
Step 800
800
#465348
oklch(42.7% 0.024 149.6)
-
Step 900
900
#3B453C
oklch(37.8% 0.02 148)
-
Step 950
950
#222823
oklch(26.9% 0.013 150.2)
#637566 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) | #757265 | 0.027 |
| Deuteranopia (no green cones) | #727067 | 0.026 |
| Tritanopia (no blue cones) | #617471 | 0.018 |
| Achromatopsia (no color) | #707070 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637566
#637566
oklch(54.3% 0.031 150)
- #7B6978
#7B6978
oklch(54.3% 0.032 331.6)
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 #637566, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.039
- Battleship Gray #6C757D ΔE 0.040
- Grey Brown #7F7053 ΔE 0.045
- Battleship Grey #6B7C85 ΔE 0.049
- Dark Taupe #7F684E ΔE 0.054
- Medium Grey #7D7F7C ΔE 0.057
- Grey Blue #647D8E ΔE 0.059
- Dull Brown #876E4B ΔE 0.060
Use #637566 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.