#66BFAA
Closest named color: Medium Aquamarine (#66CDAA). oklch(74.3% 0.092 176.4), rgb(102, 191, 170).
Aa
Black text reads best on this color (9.59:1).
About this color
#66BFAA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.092 and its hue 176°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.040 away. Black text reads best on it, at 9.59:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 9.59:1 |
| White text | 2.18:1 |
Values
| HEX | #66BFAA |
| RGB | rgb(102, 191, 170) |
| HSL | hsl(166, 41%, 57%) |
| OKLCH | oklch(74.3% 0.092 176.4) |
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 #66BFAA | 2.18:1 | Fails | Lc -47.6 | Large or bold text, headings |
| Black text on #66BFAA | 9.59:1 | AAA | Lc 61.1 | Content text, not long reading |
| #66BFAA text on white | 2.18:1 | Fails | Lc 42.9 | Non-text elements, placeholder text |
| #66BFAA text on black | 9.59:1 | AAA | Lc -59.3 | 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
#F0F7F5
oklch(97% 0.008 177.3)
-
Step 100
100
#DFEEE9
oklch(93.7% 0.017 174)
-
Step 200
200
#C4E0D8
oklch(88.4% 0.032 176.5)
-
Step 300
300
#99CDBF
oklch(80.8% 0.058 176.4)
-
Step 400
400 (this color)
#66BFAA
oklch(74.3% 0.092 176.4)
-
Step 500
500
#01A087
oklch(63.1% 0.117 176.3)
-
Step 600
600
#008771
oklch(55.7% 0.104 175.8)
-
Step 700
700
#00715F
oklch(49% 0.091 176.5)
-
Step 800
800
#005D4E
oklch(42.8% 0.079 176.7)
-
Step 900
900
#004D40
oklch(37.6% 0.07 176.4)
-
Step 950
950
#022E26
oklch(27% 0.048 177.1)
#66BFAA 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) | #B9B5A9 | 0.097 |
| Deuteranopia (no green cones) | #ABABAC | 0.092 |
| Tritanopia (no blue cones) | #42C1B9 | 0.029 |
| Achromatopsia (no color) | #AFAFAF | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BFAA
#66BFAA
oklch(74.3% 0.092 176.4)
- #DB93AD
#DB93AD
oklch(74.2% 0.092 356.3)
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 #66BFAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.040
- Pale Teal #82CBB2 ΔE 0.046
- Topaz #13BBAF ΔE 0.046
- Dark Sea Green #8FBC8F ΔE 0.049
- Muted Teal #90B494 ΔE 0.049
- Greeny Blue #42B395 ΔE 0.053
- Seafoam Blue #78D1B6 ΔE 0.055
- Medium Turquoise #48D1CC ΔE 0.057
Use #66BFAA 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.