#66C99B
Closest named color: Medium Aquamarine (#66CDAA). oklch(76.3% 0.116 161.7), rgb(102, 201, 155).
Aa
Black text reads best on this color (10.39:1).
About this color
#66C99B is a medium-light, moderately saturated green. In OKLCH its lightness is 76%, its chroma 0.116 and its hue 162°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.020 away. Black text reads best on it, at 10.39:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.116) |
| Temperature | in between |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.39:1 |
| White text | 2.02:1 |
Values
| HEX | #66C99B |
| RGB | rgb(102, 201, 155) |
| HSL | hsl(152, 48%, 59%) |
| OKLCH | oklch(76.3% 0.116 161.7) |
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 #66C99B | 2.02:1 | Fails | Lc -43.5 | Non-text elements, placeholder text |
| Black text on #66C99B | 10.39:1 | AAA | Lc 64.9 | Content text, not long reading |
| #66C99B text on white | 2.02:1 | Fails | Lc 39.0 | Non-text elements, placeholder text |
| #66C99B text on black | 10.39:1 | AAA | Lc -63.3 | 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
#D7F1E3
oklch(93.5% 0.033 162.3)
-
Step 200
200
#B4E7CC
oklch(88.5% 0.064 161.6)
-
Step 300
300 (this color)
#66C99B
oklch(76.3% 0.116 161.7)
-
Step 400
400
#00BE82
oklch(70.8% 0.156 161.8)
-
Step 500
500
#00A36E
oklch(63.2% 0.14 161.4)
-
Step 600
600
#00895C
oklch(55.7% 0.123 161.5)
-
Step 700
700
#00734D
oklch(49.1% 0.108 161.8)
-
Step 800
800
#005E3E
oklch(42.6% 0.094 161.6)
-
Step 900
900
#004F33
oklch(37.8% 0.084 161.3)
-
Step 950
950
#002F1D
oklch(27% 0.059 161.7)
#66C99B 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) | #C6BD98 | 0.111 |
| Deuteranopia (no green cones) | #B8B29E | 0.109 |
| Tritanopia (no blue cones) | #47C9BC | 0.048 |
| Achromatopsia (no color) | #B6B6B6 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66C99B
#66C99B
oklch(76.3% 0.116 161.7)
- #E594C7
#E594C7
oklch(76.4% 0.116 341.9)
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 #66C99B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.020
- Pale Teal #82CBB2 ΔE 0.044
- Seafoam Blue #78D1B6 ΔE 0.044
- Soft Green #6FC276 ΔE 0.045
- Emerald #06D6A0 ΔE 0.047
- Dark Sea Green #8FBC8F ΔE 0.048
- Greenblue #23C48B ΔE 0.049
- Green Blue #01C08D ΔE 0.058
Use #66C99B 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.