#66CD99
Closest named color: Medium Aquamarine (#66CDAA). oklch(77.2% 0.123 159.5), rgb(102, 205, 153).
Aa
Black text reads best on this color (10.75:1).
About this color
#66CD99 is a medium-light, moderately saturated green. In OKLCH its lightness is 77%, its chroma 0.123 and its hue 160°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.024 away. Black text reads best on it, at 10.75:1.
| Hue family | Greens |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.123) |
| Temperature | in between |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.75:1 |
| White text | 1.95:1 |
Values
| HEX | #66CD99 |
| RGB | rgb(102, 205, 153) |
| HSL | hsl(150, 51%, 60%) |
| OKLCH | oklch(77.2% 0.123 159.5) |
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 #66CD99 | 1.95:1 | Fails | Lc -41.7 | Non-text elements, placeholder text |
| Black text on #66CD99 | 10.75:1 | AAA | Lc 66.6 | Content text, not long reading |
| #66CD99 text on white | 1.95:1 | Fails | Lc 37.3 | Non-text elements, placeholder text |
| #66CD99 text on black | 10.75:1 | AAA | Lc -65.1 | 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
#EDF9F2
oklch(97.1% 0.016 160.6)
-
Step 100
100
#D7F2E2
oklch(93.7% 0.035 159.7)
-
Step 200
200
#B3E8C9
oklch(88.6% 0.069 159)
-
Step 300
300 (this color)
#66CD99
oklch(77.2% 0.123 159.5)
-
Step 400
400
#00BE7C
oklch(70.7% 0.161 159.6)
-
Step 500
500
#00A36A
oklch(63.1% 0.143 159.7)
-
Step 600
600
#008958
oklch(55.6% 0.127 159.5)
-
Step 700
700
#007349
oklch(49% 0.112 159.4)
-
Step 800
800
#005F3B
oklch(42.8% 0.098 159.1)
-
Step 900
900
#004F31
oklch(37.7% 0.086 159.7)
-
Step 950
950
#002F1B
oklch(26.9% 0.062 159.3)
#66CD99 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) | #CBC096 | 0.116 |
| Deuteranopia (no green cones) | #BCB59C | 0.113 |
| Tritanopia (no blue cones) | #47CCBF | 0.055 |
| Achromatopsia (no color) | #B9B9B9 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66CD99
#66CD99
oklch(77.2% 0.123 159.5)
- #E995CE
#E995CE
oklch(77.2% 0.123 339.7)
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 #66CD99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.024
- Emerald #06D6A0 ΔE 0.040
- Seafoam Blue #78D1B6 ΔE 0.044
- Soft Green #6FC276 ΔE 0.045
- Pale Teal #82CBB2 ΔE 0.048
- Greenblue #23C48B ΔE 0.052
- Dark Sea Green #8FBC8F ΔE 0.055
- Seaweed #18D17B ΔE 0.062
Use #66CD99 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.