#558B66
Closest named color: Slate Green (#658D6D). oklch(58.8% 0.081 153.4), rgb(85, 139, 102).
Aa
Black text reads best on this color (5.27:1).
About this color
#558B66 is a medium-dark, moderately saturated green. In OKLCH its lightness is 59%, its chroma 0.081 and its hue 153°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Slate Green (#658D6D), ΔE 0.023 away. Black text reads best on it, at 5.27:1.
| Hue family | Greens |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.081) |
| Temperature | in between |
| Nearest name | Slate Green (#658D6D) |
| Black text | 5.27:1 |
| White text | 3.98:1 |
Values
| HEX | #558B66 |
| RGB | rgb(85, 139, 102) |
| HSL | hsl(139, 24%, 44%) |
| OKLCH | oklch(58.8% 0.081 153.4) |
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 #558B66 | 3.98:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #558B66 | 5.27:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #558B66 text on white | 3.98:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #558B66 text on black | 5.27:1 | AA | Lc -34.6 | 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
#F3F6F4
oklch(97% 0.004 157.2)
-
Step 100
100
#E5ECE7
oklch(93.6% 0.01 155.1)
-
Step 200
200
#D0DDD3
oklch(88.5% 0.019 152.8)
-
Step 300
300
#B0C8B6
oklch(81% 0.036 153.1)
-
Step 400
400
#85AC90
oklch(70.8% 0.059 153.5)
-
Step 500
500
#659774
oklch(63.1% 0.075 153.3)
-
Step 600
600 (this color)
#558B66
oklch(58.8% 0.081 153.4)
-
Step 700
700
#3C6D4C
oklch(49% 0.076 153.3)
-
Step 800
800
#32593F
oklch(42.7% 0.062 153.8)
-
Step 900
900
#2D4935
oklch(37.7% 0.048 152.6)
-
Step 950
950
#1A2B1F
oklch(27% 0.032 153.1)
#558B66 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) | #8B8364 | 0.072 |
| Deuteranopia (no green cones) | #837D68 | 0.070 |
| Tritanopia (no blue cones) | #4B8A81 | 0.041 |
| Achromatopsia (no color) | #7F7F7F | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558B66
#558B66
oklch(58.8% 0.081 153.4)
- #9A6A91
#9A6A91
oklch(58.7% 0.082 333.4)
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 #558B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Green #658D6D ΔE 0.023
- Dark Sage #598556 ΔE 0.023
- Light Forest Green #4F9153 ΔE 0.037
- Viridian #1E9167 ΔE 0.040
- Ocean Green #3D9973 ΔE 0.041
- Dusty Teal #4C9085 ΔE 0.043
- Sea Green #2E8B57 ΔE 0.043
- Fern Green #548D44 ΔE 0.047
Use #558B66 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.