#66CF6F
Closest named color: Seaweed (#18D17B). oklch(76.9% 0.165 145.5), rgb(102, 207, 111).
Aa
Black text reads best on this color (10.71:1).
About this color
#66CF6F is a medium-light, vivid green. In OKLCH its lightness is 77%, its chroma 0.165 and its hue 145°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.036 away. Black text reads best on it, at 10.71:1.
| Hue family | Greens |
| Lightness | medium-light (77%) |
| Chroma | vivid (0.165) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 10.71:1 |
| White text | 1.95:1 |
Values
| HEX | #66CF6F |
| RGB | rgb(102, 207, 111) |
| HSL | hsl(125, 52%, 61%) |
| OKLCH | oklch(76.9% 0.165 145.5) |
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 #66CF6F | 1.95:1 | Fails | Lc -41.8 | Non-text elements, placeholder text |
| Black text on #66CF6F | 10.71:1 | AAA | Lc 66.5 | Content text, not long reading |
| #66CF6F text on white | 1.95:1 | Fails | Lc 37.4 | Non-text elements, placeholder text |
| #66CF6F text on black | 10.71:1 | AAA | Lc -65.0 | 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
#EDFAED
oklch(97.2% 0.022 145.4)
-
Step 100
100
#D7F3D7
oklch(93.6% 0.048 145.2)
-
Step 200
200
#B3EAB4
oklch(88.5% 0.092 145.2)
-
Step 300
300 (this color)
#66CF6F
oklch(76.9% 0.165 145.5)
-
Step 400
400
#00C23A
oklch(70.8% 0.22 145.5)
-
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
#007620
oklch(49.2% 0.152 145.5)
-
Step 800
800
#006118
oklch(42.8% 0.133 145.4)
-
Step 900
900
#005113
oklch(37.8% 0.117 145.5)
-
Step 950
950
#003008
oklch(26.9% 0.083 145.6)
#66CF6F 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) | #D2BF67 | 0.127 |
| Deuteranopia (no green cones) | #C4B575 | 0.127 |
| Tritanopia (no blue cones) | #55CAB8 | 0.101 |
| Achromatopsia (no color) | #B9B9B9 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66CF6F
#66CF6F
oklch(76.9% 0.165 145.5)
- #E88CED
#E88CED
oklch(76.9% 0.165 325.2)
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 #66CF6F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.036
- Soft Green #6FC276 ΔE 0.041
- Apple #6ECB3C ΔE 0.044
- Fresh Green #69D84F ΔE 0.046
- Dark Mint #48C072 ΔE 0.052
- Algae Green #21C36F ΔE 0.056
- Apple Green #76CD26 ΔE 0.056
- Aqua Green #12E193 ΔE 0.056
Use #66CF6F 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.