#638366
Closest named color: Slate Green (#658D6D). oklch(57.7% 0.057 147.2), rgb(99, 131, 102).
Aa
Black text reads best on this color (4.96:1).
About this color
#638366 is a medium-dark, muted green. In OKLCH its lightness is 58%, its chroma 0.057 and its hue 147°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Slate Green (#658D6D), ΔE 0.029 away. Black text reads best on it, at 4.96:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.057) |
| Temperature | in between |
| Nearest name | Slate Green (#658D6D) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #638366 |
| RGB | rgb(99, 131, 102) |
| HSL | hsl(126, 14%, 45%) |
| OKLCH | oklch(57.7% 0.057 147.2) |
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 #638366 | 4.22:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #638366 | 4.96:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #638366 text on white | 4.22:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #638366 text on black | 4.96:1 | AA | Lc -32.5 | 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
#F4F6F4
oklch(97.1% 0.003 145.5)
-
Step 100
100
#E7EBE7
oklch(93.6% 0.007 145.5)
-
Step 200
200
#D3DCD4
oklch(88.5% 0.015 148.8)
-
Step 300
300
#B6C5B7
oklch(80.8% 0.025 147.2)
-
Step 400
400
#90A892
oklch(70.7% 0.041 147.4)
-
Step 500
500
#759377
oklch(63.2% 0.053 146.7)
-
Step 600
600 (this color)
#638366
oklch(57.7% 0.057 147.2)
-
Step 700
700
#4C694F
oklch(49% 0.053 147.4)
-
Step 800
800
#3F5641
oklch(42.8% 0.044 147)
-
Step 900
900
#364737
oklch(37.8% 0.035 146.4)
-
Step 950
950
#1F2920
oklch(26.8% 0.022 147.6)
#638366 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) | #847D64 | 0.047 |
| Deuteranopia (no green cones) | #7F7A67 | 0.046 |
| Tritanopia (no blue cones) | #5F817B | 0.034 |
| Achromatopsia (no color) | #7B7B7B | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638366
#638366
oklch(57.7% 0.057 147.2)
- #8C6E8B
#8C6E8B
oklch(57.7% 0.056 327.3)
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 #638366, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Green #658D6D ΔE 0.029
- Dark Sage #598556 ΔE 0.030
- Military Green #667C3E ΔE 0.050
- Dusty Teal #4C9085 ΔE 0.050
- Green Grey #77926F ΔE 0.053
- Medium Grey #7D7F7C ΔE 0.055
- Drab #828344 ΔE 0.056
- Swamp #698339 ΔE 0.057
Use #638366 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.