#428D5A
Closest named color: Sea Green (#2E8B57). oklch(58.2% 0.109 152.1), rgb(66, 141, 90).
Aa
Black text reads best on this color (5.18:1).
About this color
#428D5A is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.109 and its hue 152°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.017 away. Black text reads best on it, at 5.18:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.109) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.18:1 |
| White text | 4.04:1 |
Values
| HEX | #428D5A |
| RGB | rgb(66, 141, 90) |
| HSL | hsl(139, 36%, 41%) |
| OKLCH | oklch(58.2% 0.109 152.1) |
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 #428D5A | 4.04:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #428D5A | 5.18:1 | AA | Lc 36.6 | Non-text elements, placeholder text |
| #428D5A text on white | 4.04:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #428D5A text on black | 5.18:1 | AA | Lc -34.2 | 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
#AACAB1
oklch(80.8% 0.049 151.7)
-
Step 400
400
#7BAF89
oklch(70.7% 0.078 152.5)
-
Step 500
500
#579B6B
oklch(63.1% 0.101 152.1)
-
Step 600
600 (this color)
#428D5A
oklch(58.2% 0.109 152.1)
-
Step 700
700
#2B7143
oklch(49.2% 0.102 152)
-
Step 800
800
#255C37
oklch(42.7% 0.085 151.9)
-
Step 900
900
#244B30
oklch(37.6% 0.064 152.2)
-
Step 950
950
#162C1C
oklch(26.9% 0.041 151.6)
#428D5A 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) | #8D8357 | 0.093 |
| Deuteranopia (no green cones) | #837B5D | 0.092 |
| Tritanopia (no blue cones) | #308B80 | 0.058 |
| Achromatopsia (no color) | #7E7E7E | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428D5A
#428D5A
oklch(58.2% 0.109 152.1)
- #A06197
#A06197
oklch(58.1% 0.109 332.2)
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 #428D5A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.017
- Light Forest Green #4F9153 ΔE 0.021
- Viridian #1E9167 ΔE 0.024
- Fern Green #548D44 ΔE 0.029
- Dark Sage #598556 ΔE 0.029
- Ocean Green #3D9973 ΔE 0.041
- Moss Green #658B38 ΔE 0.046
- Slate Green #658D6D ΔE 0.049
Use #428D5A 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.