#428D5B
Closest named color: Sea Green (#2E8B57). oklch(58.2% 0.108 152.5), rgb(66, 141, 91).
Aa
Black text reads best on this color (5.19:1).
About this color
#428D5B is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.108 and its hue 153°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.018 away. Black text reads best on it, at 5.19:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.108) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #428D5B |
| RGB | rgb(66, 141, 91) |
| HSL | hsl(140, 36%, 41%) |
| OKLCH | oklch(58.2% 0.108 152.5) |
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 #428D5B | 4.04:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #428D5B | 5.19:1 | AA | Lc 36.6 | Non-text elements, placeholder text |
| #428D5B text on white | 4.04:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #428D5B text on black | 5.19:1 | 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
#CDDFD1
oklch(88.6% 0.027 152.3)
-
Step 300
300
#AACAB2
oklch(80.9% 0.048 152.8)
-
Step 400
400
#7BAF89
oklch(70.7% 0.078 152.5)
-
Step 500
500
#579B6C
oklch(63.1% 0.1 152.6)
-
Step 600
600 (this color)
#428D5B
oklch(58.2% 0.108 152.5)
-
Step 700
700
#2B7144
oklch(49.2% 0.101 152.5)
-
Step 800
800
#255C38
oklch(42.7% 0.084 152.5)
-
Step 900
900
#244B31
oklch(37.6% 0.063 153.1)
-
Step 950
950
#162C1D
oklch(27% 0.04 153.2)
#428D5B 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) | #8D8358 | 0.093 |
| Deuteranopia (no green cones) | #837B5E | 0.092 |
| Tritanopia (no blue cones) | #308B80 | 0.056 |
| Achromatopsia (no color) | #7E7E7E | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428D5B
#428D5B
oklch(58.2% 0.108 152.5)
- #A06297
#A06297
oklch(58.3% 0.107 332.2)
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 #428D5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.018
- Light Forest Green #4F9153 ΔE 0.022
- Viridian #1E9167 ΔE 0.023
- Dark Sage #598556 ΔE 0.029
- Fern Green #548D44 ΔE 0.030
- Ocean Green #3D9973 ΔE 0.040
- Moss Green #658B38 ΔE 0.047
- Slate Green #658D6D ΔE 0.048
Use #428D5B 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.