#66B59E
Closest named color: Greeny Blue (#42B395). oklch(71.6% 0.086 172.9), rgb(102, 181, 158).
Aa
Black text reads best on this color (8.66:1).
About this color
#66B59E is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.086 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.033 away. Black text reads best on it, at 8.66:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 8.66:1 |
| White text | 2.42:1 |
Values
| HEX | #66B59E |
| RGB | rgb(102, 181, 158) |
| HSL | hsl(163, 35%, 55%) |
| OKLCH | oklch(71.6% 0.086 172.9) |
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 #66B59E | 2.42:1 | Fails | Lc -52.6 | Large or bold text, headings |
| Black text on #66B59E | 8.66:1 | AAA | Lc 56.4 | Large or bold text, headings |
| #66B59E text on white | 2.42:1 | Fails | Lc 47.6 | Large or bold text, headings |
| #66B59E text on black | 8.66:1 | AAA | Lc -54.5 | 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
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E0EDE9
oklch(93.5% 0.015 175.7)
-
Step 200
200
#C6E0D7
oklch(88.5% 0.03 172.8)
-
Step 300
300
#9ECCBD
oklch(80.8% 0.053 173)
-
Step 400
400 (this color)
#66B59E
oklch(71.6% 0.086 172.9)
-
Step 500
500
#2A9F83
oklch(63.2% 0.11 172.8)
-
Step 600
600
#00876D
oklch(55.6% 0.107 172.9)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#005D4B
oklch(42.7% 0.081 173.5)
-
Step 900
900
#024E3E
oklch(37.8% 0.072 172.8)
-
Step 950
950
#082E24
oklch(27.2% 0.046 171.6)
#66B59E 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) | #B0AC9D | 0.089 |
| Deuteranopia (no green cones) | #A3A3A0 | 0.084 |
| Tritanopia (no blue cones) | #4BB6AE | 0.028 |
| Achromatopsia (no color) | #A6A6A6 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B59E
#66B59E
oklch(71.6% 0.086 172.9)
- #CE8DA8
#CE8DA8
oklch(71.6% 0.086 352.9)
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 #66B59E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.033
- Topaz #13BBAF ΔE 0.044
- Muted Teal #90B494 ΔE 0.045
- Light Sea Green #20B2AA ΔE 0.046
- Tea #65AB7C ΔE 0.048
- Dark Sea Green #8FBC8F ΔE 0.054
- Faded Green #7BB274 ΔE 0.055
- Sage Green #88B378 ΔE 0.056
Use #66B59E 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.