#66BC99
Closest named color: Greeny Blue (#42B395). oklch(73.1% 0.099 165.4), rgb(102, 188, 153).
Aa
Black text reads best on this color (9.21:1).
About this color
#66BC99 is a medium-light, moderately saturated green. In OKLCH its lightness is 73%, its chroma 0.099 and its hue 165°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.041 away. Black text reads best on it, at 9.21:1.
| Hue family | Greens |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.099) |
| Temperature | in between |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 9.21:1 |
| White text | 2.27:1 |
Values
| HEX | #66BC99 |
| RGB | rgb(102, 188, 153) |
| HSL | hsl(156, 39%, 57%) |
| OKLCH | oklch(73.1% 0.099 165.4) |
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 #66BC99 | 2.27:1 | Fails | Lc -49.6 | Large or bold text, headings |
| Black text on #66BC99 | 9.21:1 | AAA | Lc 59.2 | Large or bold text, headings |
| #66BC99 text on white | 2.27:1 | Fails | Lc 44.8 | Non-text elements, placeholder text |
| #66BC99 text on black | 9.21:1 | AAA | Lc -57.4 | Large or bold text, headings |
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 400.
-
Step 50
50
#F1F7F4
oklch(97.1% 0.007 164.9)
-
Step 100
100
#DFEEE7
oklch(93.6% 0.018 166.4)
-
Step 200
200
#C5E1D4
oklch(88.6% 0.035 165.9)
-
Step 300
300
#9BCEB7
oklch(80.9% 0.062 165.4)
-
Step 400
400 (this color)
#66BC99
oklch(73.1% 0.099 165.4)
-
Step 500
500
#19A177
oklch(63.1% 0.126 165.6)
-
Step 600
600
#008863
oklch(55.6% 0.116 165.8)
-
Step 700
700
#007352
oklch(49.2% 0.104 164.9)
-
Step 800
800
#005E43
oklch(42.7% 0.089 165.5)
-
Step 900
900
#004E37
oklch(37.6% 0.079 165.5)
-
Step 950
950
#052E20
oklch(26.9% 0.052 165.4)
#66BC99 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) | #B9B197 | 0.099 |
| Deuteranopia (no green cones) | #ABA89B | 0.094 |
| Tritanopia (no blue cones) | #4BBCB2 | 0.038 |
| Achromatopsia (no color) | #ACACAC | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BC99
#66BC99
oklch(73.1% 0.099 165.4)
- #D58FB6
#D58FB6
oklch(73.2% 0.098 345.3)
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 #66BC99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.041
- Dark Sea Green #8FBC8F ΔE 0.042
- Muted Teal #90B494 ΔE 0.046
- Medium Aquamarine #66CDAA ΔE 0.047
- Faded Green #7BB274 ΔE 0.048
- Sage Green #88B378 ΔE 0.048
- Topaz #13BBAF ΔE 0.050
- Lichen #8FB67B ΔE 0.050
Use #66BC99 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.