#428A51
Closest named color: Sea Green (#2E8B57). oklch(57.2% 0.113 148.6), rgb(66, 138, 81).
Aa
Black text reads best on this color (4.98:1).
About this color
#428A51 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.113 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.014 away. Black text reads best on it, at 4.98:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.113) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #428A51 |
| RGB | rgb(66, 138, 81) |
| HSL | hsl(133, 35%, 40%) |
| OKLCH | oklch(57.2% 0.113 148.6) |
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 #428A51 | 4.21:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #428A51 | 4.98:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #428A51 text on white | 4.21:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #428A51 text on black | 4.98:1 | AA | Lc -32.8 | 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
#E3EDE4
oklch(93.6% 0.016 148.4)
-
Step 200
200
#CDDFCF
oklch(88.6% 0.029 148.6)
-
Step 300
300
#ABCAAF
oklch(80.9% 0.05 148.8)
-
Step 400
400
#7DAF84
oklch(70.7% 0.082 148.3)
-
Step 500
500
#5A9B66
oklch(63.2% 0.104 148.7)
-
Step 600
600 (this color)
#428A51
oklch(57.2% 0.113 148.6)
-
Step 700
700
#2E713D
oklch(49.2% 0.106 148.5)
-
Step 800
800
#285C33
oklch(42.8% 0.087 148.5)
-
Step 900
900
#254B2D
oklch(37.6% 0.067 149.1)
-
Step 950
950
#172C1A
oklch(26.9% 0.043 147.7)
#428A51 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) | #8B804D | 0.092 |
| Deuteranopia (no green cones) | #817955 | 0.090 |
| Tritanopia (no blue cones) | #34887C | 0.064 |
| Achromatopsia (no color) | #7B7B7B | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428A51
#428A51
oklch(57.2% 0.113 148.6)
- #9C5E99
#9C5E99
oklch(57.2% 0.113 328.7)
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 #428A51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.014
- Fern Green #548D44 ΔE 0.025
- Light Forest Green #4F9153 ΔE 0.026
- Dark Sage #598556 ΔE 0.029
- Viridian #1E9167 ΔE 0.032
- Moss Green #658B38 ΔE 0.042
- Swamp #698339 ΔE 0.044
- Jungle Green #048243 ΔE 0.047
Use #428A51 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.