#428B6D
Closest named color: Viridian (#1E9167). oklch(58.1% 0.088 164.4), rgb(66, 139, 109).
Aa
Black text reads best on this color (5.14:1).
About this color
#428B6D is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.088 and its hue 164°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.031 away. Black text reads best on it, at 5.14:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.088) |
| Temperature | in between |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.14:1 |
| White text | 4.08:1 |
Values
| HEX | #428B6D |
| RGB | rgb(66, 139, 109) |
| HSL | hsl(155, 36%, 40%) |
| OKLCH | oklch(58.1% 0.088 164.4) |
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 #428B6D | 4.08:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #428B6D | 5.14:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #428B6D text on white | 4.08:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #428B6D text on black | 5.14:1 | AA | Lc -33.8 | 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
#F2F7F4
oklch(97.2% 0.007 160.1)
-
Step 100
100
#E3ECE8
oklch(93.5% 0.011 167.8)
-
Step 200
200
#CDDED5
oklch(88.5% 0.022 163)
-
Step 300
300
#AAC9BA
oklch(80.9% 0.039 164.6)
-
Step 400
400
#7CAD96
oklch(70.6% 0.062 164.1)
-
Step 500
500
#58997D
oklch(63.1% 0.08 164.6)
-
Step 600
600 (this color)
#428B6D
oklch(58.1% 0.088 164.4)
-
Step 700
700
#2B6F55
oklch(49% 0.081 165)
-
Step 800
800
#265B45
oklch(42.8% 0.068 163.7)
-
Step 900
900
#244A3A
oklch(37.6% 0.052 164.5)
-
Step 950
950
#162C22
oklch(27.1% 0.034 163.4)
#428B6D 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) | #89826B | 0.087 |
| Deuteranopia (no green cones) | #7E7A6F | 0.084 |
| Tritanopia (no blue cones) | #288B83 | 0.035 |
| Achromatopsia (no color) | #7E7E7E | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428B6D
#428B6D
oklch(58.1% 0.088 164.4)
- #9F6587
#9F6587
oklch(58% 0.087 344.1)
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 #428B6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.031
- Dark Sage #598556 ΔE 0.034
- Slate Green #658D6D ΔE 0.037
- Sea Green #2E8B57 ΔE 0.038
- Dusty Teal #4C9085 ΔE 0.038
- Ocean Green #3D9973 ΔE 0.040
- Light Forest Green #4F9153 ΔE 0.046
- Dark Cyan #008B8B ΔE 0.050
Use #428B6D 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.