#66D187
Closest named color: Soft Green (#6FC276). oklch(77.8% 0.145 151.7), rgb(102, 209, 135).
Aa
Black text reads best on this color (11.03:1).
About this color
#66D187 is a medium-light, vivid green. In OKLCH its lightness is 78%, its chroma 0.145 and its hue 152°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Soft Green (#6FC276), ΔE 0.040 away. Black text reads best on it, at 11.03:1.
| Hue family | Greens |
| Lightness | medium-light (78%) |
| Chroma | vivid (0.145) |
| Temperature | in between |
| Nearest name | Soft Green (#6FC276) |
| Black text | 11.03:1 |
| White text | 1.90:1 |
Values
| HEX | #66D187 |
| RGB | rgb(102, 209, 135) |
| HSL | hsl(139, 54%, 61%) |
| OKLCH | oklch(77.8% 0.145 151.7) |
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 #66D187 | 1.90:1 | Fails | Lc -40.3 | Non-text elements, placeholder text |
| Black text on #66D187 | 11.03:1 | AAA | Lc 67.9 | Content text, not long reading |
| #66D187 text on white | 1.90:1 | Fails | Lc 36.0 | Non-text elements, placeholder text |
| #66D187 text on black | 11.03:1 | AAA | Lc -66.5 | 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
#ECF9EF
oklch(97% 0.019 152.8)
-
Step 100
100
#D6F2DC
oklch(93.5% 0.042 151.8)
-
Step 200
200
#B2E9BF
oklch(88.5% 0.081 151.7)
-
Step 300
300 (this color)
#66D187
oklch(77.8% 0.145 151.7)
-
Step 400
400
#00C061
oklch(70.7% 0.187 151.7)
-
Step 500
500
#00A552
oklch(63.2% 0.168 151.6)
-
Step 600
600
#008A44
oklch(55.5% 0.147 151.7)
-
Step 700
700
#007538
oklch(49.2% 0.131 151.5)
-
Step 800
800
#00602D
oklch(42.8% 0.114 151.6)
-
Step 900
900
#005025
oklch(37.8% 0.1 151.8)
-
Step 950
950
#003013
oklch(27.1% 0.072 151.4)
#66D187 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) | #D2C282 | 0.125 |
| Deuteranopia (no green cones) | #C2B88C | 0.121 |
| Tritanopia (no blue cones) | #4DCEBE | 0.078 |
| Achromatopsia (no color) | #BCBCBC | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D187
#66D187
oklch(77.8% 0.145 151.7)
- #EC92E0
#EC92E0
oklch(77.7% 0.146 331.8)
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 #66D187, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Green #6FC276 ΔE 0.040
- Emerald #06D6A0 ΔE 0.042
- Seaweed #18D17B ΔE 0.044
- Aqua Green #12E193 ΔE 0.049
- Medium Aquamarine #66CDAA ΔE 0.052
- Greenblue #23C48B ΔE 0.057
- Dark Mint #48C072 ΔE 0.058
- Weird Green #3AE57F ΔE 0.063
Use #66D187 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.