#66D489
Closest named color: Emerald (#06D6A0). oklch(78.6% 0.148 152), rgb(102, 212, 137).
Aa
Black text reads best on this color (11.34:1).
About this color
#66D489 is a light, vivid green. In OKLCH its lightness is 79%, its chroma 0.148 and its hue 152°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.042 away. Black text reads best on it, at 11.34:1.
| Hue family | Greens |
| Lightness | light (79%) |
| Chroma | vivid (0.148) |
| Temperature | in between |
| Nearest name | Emerald (#06D6A0) |
| Black text | 11.34:1 |
| White text | 1.85:1 |
Values
| HEX | #66D489 |
| RGB | rgb(102, 212, 137) |
| HSL | hsl(139, 56%, 62%) |
| OKLCH | oklch(78.6% 0.148 152) |
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 #66D489 | 1.85:1 | Fails | Lc -38.8 | Non-text elements, placeholder text |
| Black text on #66D489 | 11.34:1 | AAA | Lc 69.3 | Content text, not long reading |
| #66D489 text on white | 1.85:1 | Fails | Lc 34.6 | Non-text elements, placeholder text |
| #66D489 text on black | 11.34:1 | AAA | Lc -68.0 | Content text, not long reading |
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 300.
-
Step 50
50
#ECFAEF
oklch(97.2% 0.021 152.2)
-
Step 100
100
#D6F3DC
oklch(93.7% 0.043 151.5)
-
Step 200
200
#B1E9BF
oklch(88.4% 0.081 152.2)
-
Step 300
300 (this color)
#66D489
oklch(78.6% 0.148 152)
-
Step 400
400
#00C062
oklch(70.7% 0.187 151.9)
-
Step 500
500
#00A553
oklch(63.2% 0.167 151.8)
-
Step 600
600
#008A45
oklch(55.5% 0.146 152)
-
Step 700
700
#007439
oklch(49% 0.129 152)
-
Step 800
800
#00602E
oklch(42.8% 0.113 152)
-
Step 900
900
#005025
oklch(37.8% 0.1 151.8)
-
Step 950
950
#003014
oklch(27.1% 0.071 152.1)
#66D489 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) | #D5C584 | 0.128 |
| Deuteranopia (no green cones) | #C5BA8E | 0.125 |
| Tritanopia (no blue cones) | #4CD1C1 | 0.079 |
| Achromatopsia (no color) | #BEBEBE | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D489
#66D489
oklch(78.6% 0.148 152)
- #F094E3
#F094E3
oklch(78.6% 0.148 332.1)
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 #66D489, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.042
- Aqua Green #12E193 ΔE 0.043
- Seaweed #18D17B ΔE 0.046
- Soft Green #6FC276 ΔE 0.048
- Medium Aquamarine #66CDAA ΔE 0.054
- Weird Green #3AE57F ΔE 0.057
- Greenblue #23C48B ΔE 0.064
- Light Moss Green #A6C875 ΔE 0.065
Use #66D489 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.