#66D5BB
Closest named color: Seafoam Blue (#78D1B6). oklch(80.1% 0.109 175.9), rgb(102, 213, 187).
Aa
Black text reads best on this color (11.80:1).
About this color
#66D5BB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.109 and its hue 176°. Its hue sits on the cool side of the wheel. The nearest named color is Seafoam Blue (#78D1B6), ΔE 0.016 away. Black text reads best on it, at 11.80:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Seafoam Blue (#78D1B6) |
| Black text | 11.80:1 |
| White text | 1.77:1 |
Values
| HEX | #66D5BB |
| RGB | rgb(102, 213, 187) |
| HSL | hsl(166, 57%, 62%) |
| OKLCH | oklch(80.1% 0.109 175.9) |
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 #66D5BB | 1.77:1 | Fails | Lc -36.6 | Non-text elements, placeholder text |
| Black text on #66D5BB | 11.80:1 | AAA | Lc 71.3 | Content text, not long reading |
| #66D5BB text on white | 1.77:1 | Fails | Lc 32.6 | Non-text elements, placeholder text |
| #66D5BB text on black | 11.80:1 | AAA | Lc -70.1 | 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
#ECF9F5
oklch(97.1% 0.015 175.7)
-
Step 100
100
#D5F1E9
oklch(93.6% 0.031 176.6)
-
Step 200
200
#AFE7D7
oklch(88.5% 0.061 175.4)
-
Step 300
300 (this color)
#66D5BB
oklch(80.1% 0.109 175.9)
-
Step 400
400
#00BB9D
oklch(70.7% 0.133 175.7)
-
Step 500
500
#00A087
oklch(63.1% 0.118 176.3)
-
Step 600
600
#008771
oklch(55.7% 0.104 175.8)
-
Step 700
700
#00715F
oklch(49% 0.091 176.5)
-
Step 800
800
#005D4D
oklch(42.7% 0.08 175.6)
-
Step 900
900
#004D40
oklch(37.6% 0.07 176.4)
-
Step 950
950
#002E25
oklch(26.9% 0.05 175.6)
#66D5BB 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) | #CECABA | 0.114 |
| Deuteranopia (no green cones) | #BDBDBD | 0.109 |
| Tritanopia (no blue cones) | #2ED7CD | 0.034 |
| Achromatopsia (no color) | #C2C2C2 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D5BB
#66D5BB
oklch(80.1% 0.109 175.9)
- #F6A0C0
#F6A0C0
oklch(80% 0.109 355.9)
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 #66D5BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seafoam Blue #78D1B6 ΔE 0.016
- Medium Aquamarine #66CDAA ΔE 0.027
- Pale Teal #82CBB2 ΔE 0.032
- Medium Turquoise #48D1CC ΔE 0.034
- Turquoise #40E0D0 ΔE 0.036
- Tiffany Blue #94D2BD ΔE 0.043
- Dark Turquoise #00CED1 ΔE 0.056
- Aqua Marine #2EE8BB ΔE 0.057
Use #66D5BB 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.