#428C56
Closest named color: Sea Green (#2E8B57). oklch(57.8% 0.111 150.4), rgb(66, 140, 86).
Aa
Black text reads best on this color (5.11:1).
About this color
#428C56 is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.111 and its hue 150°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.015 away. Black text reads best on it, at 5.11:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.111) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #428C56 |
| RGB | rgb(66, 140, 86) |
| HSL | hsl(136, 36%, 40%) |
| OKLCH | oklch(57.8% 0.111 150.4) |
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 #428C56 | 4.10:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #428C56 | 5.11:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #428C56 text on white | 4.10:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #428C56 text on black | 5.11:1 | AA | Lc -33.7 | 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
#F2F7F3
oklch(97.1% 0.007 151.9)
-
Step 100
100
#E3EDE5
oklch(93.6% 0.015 151.8)
-
Step 200
200
#CDDFD0
oklch(88.6% 0.028 150.4)
-
Step 300
300
#AACAB0
oklch(80.8% 0.05 150.6)
-
Step 400
400
#7CAF87
oklch(70.7% 0.079 150.7)
-
Step 500
500
#589B68
oklch(63.1% 0.103 150.3)
-
Step 600
600 (this color)
#428C56
oklch(57.8% 0.111 150.4)
-
Step 700
700
#2C7140
oklch(49.1% 0.104 150.3)
-
Step 800
800
#265C35
oklch(42.7% 0.086 150.3)
-
Step 900
900
#244B2E
oklch(37.5% 0.067 150.4)
-
Step 950
950
#162C1B
oklch(26.9% 0.042 150.1)
#428C56 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) | #8D8252 | 0.093 |
| Deuteranopia (no green cones) | #827A59 | 0.092 |
| Tritanopia (no blue cones) | #328A7E | 0.060 |
| Achromatopsia (no color) | #7D7D7D | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428C56
#428C56
oklch(57.8% 0.111 150.4)
- #9F6099
#9F6099
oklch(57.9% 0.112 330.4)
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 #428C56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.015
- Light Forest Green #4F9153 ΔE 0.021
- Fern Green #548D44 ΔE 0.026
- Viridian #1E9167 ΔE 0.027
- Dark Sage #598556 ΔE 0.029
- Moss Green #658B38 ΔE 0.043
- Ocean Green #3D9973 ΔE 0.046
- Swamp #698339 ΔE 0.047
Use #428C56 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.