#66BE99
Closest named color: Dark Sea Green (#8FBC8F). oklch(73.6% 0.102 164.5), rgb(102, 190, 153).
Aa
Black text reads best on this color (9.39:1).
About this color
#66BE99 is a medium-light, moderately saturated green. In OKLCH its lightness is 74%, its chroma 0.102 and its hue 165°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Sea Green (#8FBC8F), ΔE 0.041 away. Black text reads best on it, at 9.39:1.
| Hue family | Greens |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.102) |
| Temperature | in between |
| Nearest name | Dark Sea Green (#8FBC8F) |
| Black text | 9.39:1 |
| White text | 2.23:1 |
Values
| HEX | #66BE99 |
| RGB | rgb(102, 190, 153) |
| HSL | hsl(155, 40%, 57%) |
| OKLCH | oklch(73.6% 0.102 164.5) |
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 #66BE99 | 2.23:1 | Fails | Lc -48.7 | Large or bold text, headings |
| Black text on #66BE99 | 9.39:1 | AAA | Lc 60.1 | Content text, not long reading |
| #66BE99 text on white | 2.23:1 | Fails | Lc 43.9 | Non-text elements, placeholder text |
| #66BE99 text on black | 9.39:1 | AAA | Lc -58.2 | 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
#C5E1D3
oklch(88.5% 0.035 164.1)
-
Step 300
300
#9BCEB6
oklch(80.9% 0.063 164.4)
-
Step 400
400 (this color)
#66BE99
oklch(73.6% 0.102 164.5)
-
Step 500
500
#12A275
oklch(63.2% 0.13 164.5)
-
Step 600
600
#008861
oklch(55.5% 0.117 164.6)
-
Step 700
700
#007351
oklch(49.2% 0.104 164.3)
-
Step 800
800
#005E42
oklch(42.7% 0.09 164.7)
-
Step 900
900
#004E36
oklch(37.5% 0.079 164.5)
-
Step 950
950
#042E1F
oklch(26.8% 0.053 164.2)
#66BE99 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) | #BBB397 | 0.101 |
| Deuteranopia (no green cones) | #ADA99B | 0.097 |
| Tritanopia (no blue cones) | #4BBEB3 | 0.039 |
| Achromatopsia (no color) | #ADADAD | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BE99
#66BE99
oklch(73.6% 0.102 164.5)
- #D88FB9
#D88FB9
oklch(73.6% 0.103 344.5)
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 #66BE99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sea Green #8FBC8F ΔE 0.041
- Medium Aquamarine #66CDAA ΔE 0.042
- Greeny Blue #42B395 ΔE 0.045
- Muted Teal #90B494 ΔE 0.048
- Faded Green #7BB274 ΔE 0.049
- Sage Green #88B378 ΔE 0.049
- Greenblue #23C48B ΔE 0.050
- Lichen #8FB67B ΔE 0.050
Use #66BE99 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.