#66D16F
Closest named color: Seaweed (#18D17B). oklch(77.4% 0.168 145.4), rgb(102, 209, 111).
Aa
Black text reads best on this color (10.91:1).
About this color
#66D16F is a medium-light, vivid green. In OKLCH its lightness is 77%, its chroma 0.168 and its hue 145°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.037 away. Black text reads best on it, at 10.91:1.
| Hue family | Greens |
| Lightness | medium-light (77%) |
| Chroma | vivid (0.168) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 10.91:1 |
| White text | 1.92:1 |
Values
| HEX | #66D16F |
| RGB | rgb(102, 209, 111) |
| HSL | hsl(125, 54%, 61%) |
| OKLCH | oklch(77.4% 0.168 145.4) |
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 #66D16F | 1.92:1 | Fails | Lc -40.8 | Non-text elements, placeholder text |
| Black text on #66D16F | 10.91:1 | AAA | Lc 67.4 | Content text, not long reading |
| #66D16F text on white | 1.92:1 | Fails | Lc 36.5 | Non-text elements, placeholder text |
| #66D16F text on black | 10.91:1 | AAA | Lc -65.9 | 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
#EDFAED
oklch(97.2% 0.022 145.4)
-
Step 100
100
#D6F3D7
oklch(93.6% 0.048 146.1)
-
Step 200
200
#B2EAB4
oklch(88.5% 0.093 145.6)
-
Step 300
300 (this color)
#66D16F
oklch(77.4% 0.168 145.4)
-
Step 400
400
#00C239
oklch(70.8% 0.22 145.4)
-
Step 500
500
#00A630
oklch(63.1% 0.196 145.4)
-
Step 600
600
#008C27
oklch(55.7% 0.173 145.4)
-
Step 700
700
#00761F
oklch(49.2% 0.153 145.3)
-
Step 800
800
#006118
oklch(42.8% 0.133 145.4)
-
Step 900
900
#005112
oklch(37.8% 0.118 145.3)
-
Step 950
950
#003008
oklch(26.9% 0.083 145.6)
#66D16F 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) | #D4C167 | 0.129 |
| Deuteranopia (no green cones) | #C5B776 | 0.128 |
| Tritanopia (no blue cones) | #54CCBA | 0.103 |
| Achromatopsia (no color) | #BBBBBB | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D16F
#66D16F
oklch(77.4% 0.168 145.4)
- #EB8DEF
#EB8DEF
oklch(77.5% 0.167 325.6)
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 #66D16F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.037
- Fresh Green #69D84F ΔE 0.041
- Apple #6ECB3C ΔE 0.044
- Soft Green #6FC276 ΔE 0.046
- Aqua Green #12E193 ΔE 0.053
- Weird Green #3AE57F ΔE 0.054
- Apple Green #76CD26 ΔE 0.054
- Dark Mint #48C072 ΔE 0.057
Use #66D16F 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.