#428A5C
Closest named color: Sea Green (#2E8B57). oklch(57.4% 0.102 153.7), rgb(66, 138, 92).
Aa
Black text reads best on this color (5.02:1).
About this color
#428A5C is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.102 and its hue 154°. 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 5.02:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.102) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.02:1 |
| White text | 4.18:1 |
Values
| HEX | #428A5C |
| RGB | rgb(66, 138, 92) |
| HSL | hsl(142, 35%, 40%) |
| OKLCH | oklch(57.4% 0.102 153.7) |
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 #428A5C | 4.18:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #428A5C | 5.02:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #428A5C text on white | 4.18:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #428A5C text on black | 5.02:1 | AA | Lc -33.0 | 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
#E3EDE6
oklch(93.7% 0.014 155.6)
-
Step 200
200
#CDDED1
oklch(88.4% 0.025 152.8)
-
Step 300
300
#ABCAB3
oklch(81% 0.046 153.2)
-
Step 400
400
#7DAE8C
oklch(70.6% 0.072 154)
-
Step 500
500
#599A6F
oklch(63.1% 0.094 153.9)
-
Step 600
600 (this color)
#428A5C
oklch(57.4% 0.102 153.7)
-
Step 700
700
#2E7047
oklch(49.1% 0.094 153.7)
-
Step 800
800
#275B3A
oklch(42.6% 0.079 153.6)
-
Step 900
900
#254B32
oklch(37.7% 0.061 153.5)
-
Step 950
950
#162C1E
oklch(27% 0.039 154.9)
#428A5C 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) | #8A8059 | 0.090 |
| Deuteranopia (no green cones) | #80795F | 0.088 |
| Tritanopia (no blue cones) | #30887E | 0.053 |
| Achromatopsia (no color) | #7C7C7C | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428A5C
#428A5C
oklch(57.4% 0.102 153.7)
- #9D6192
#9D6192
oklch(57.5% 0.102 333.7)
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 #428A5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.018
- Dark Sage #598556 ΔE 0.024
- Viridian #1E9167 ΔE 0.026
- Light Forest Green #4F9153 ΔE 0.030
- Fern Green #548D44 ΔE 0.036
- Ocean Green #3D9973 ΔE 0.046
- Slate Green #658D6D ΔE 0.048
- Swamp #698339 ΔE 0.050
Use #428A5C 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.