#66CBB2
Closest named color: Medium Aquamarine (#66CDAA). oklch(77.4% 0.102 175.2), rgb(102, 203, 178).
Aa
Black text reads best on this color (10.75:1).
About this color
#66CBB2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.102 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.014 away. Black text reads best on it, at 10.75:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.75:1 |
| White text | 1.95:1 |
Values
| HEX | #66CBB2 |
| RGB | rgb(102, 203, 178) |
| HSL | hsl(165, 49%, 60%) |
| OKLCH | oklch(77.4% 0.102 175.2) |
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 #66CBB2 | 1.95:1 | Fails | Lc -41.7 | Non-text elements, placeholder text |
| Black text on #66CBB2 | 10.75:1 | AAA | Lc 66.5 | Content text, not long reading |
| #66CBB2 text on white | 1.95:1 | Fails | Lc 37.4 | Non-text elements, placeholder text |
| #66CBB2 text on black | 10.75:1 | AAA | Lc -65.1 | 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
#EDF9F5
oklch(97.2% 0.014 174.2)
-
Step 100
100
#D7F1E9
oklch(93.7% 0.029 175.2)
-
Step 200
200
#B2E6D7
oklch(88.5% 0.057 175.3)
-
Step 300
300 (this color)
#66CBB2
oklch(77.4% 0.102 175.2)
-
Step 400
400
#00BB9C
oklch(70.7% 0.133 175.1)
-
Step 500
500
#00A086
oklch(63% 0.118 175.6)
-
Step 600
600
#008770
oklch(55.7% 0.105 175.1)
-
Step 700
700
#00715E
oklch(49% 0.092 175.6)
-
Step 800
800
#005D4D
oklch(42.7% 0.08 175.6)
-
Step 900
900
#004E40
oklch(37.9% 0.071 175.3)
-
Step 950
950
#002E25
oklch(26.9% 0.05 175.6)
#66CBB2 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) | #C5C0B1 | 0.107 |
| Deuteranopia (no green cones) | #B5B5B4 | 0.102 |
| Tritanopia (no blue cones) | #39CDC3 | 0.032 |
| Achromatopsia (no color) | #B9B9B9 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66CBB2
#66CBB2
oklch(77.4% 0.102 175.2)
- #EA9AB8
#EA9AB8
oklch(77.4% 0.102 355.6)
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 #66CBB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.014
- Seafoam Blue #78D1B6 ΔE 0.025
- Pale Teal #82CBB2 ΔE 0.025
- Medium Turquoise #48D1CC ΔE 0.036
- Dark Turquoise #00CED1 ΔE 0.052
- Tiffany Blue #94D2BD ΔE 0.053
- Dark Sea Green #8FBC8F ΔE 0.057
- Turquoise #40E0D0 ΔE 0.059
Use #66CBB2 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.