#66BDCB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74.9% 0.086 209), rgb(102, 189, 203).
Aa
Black text reads best on this color (9.70:1).
About this color
#66BDCB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.086 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.054 away. Black text reads best on it, at 9.70:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.70:1 |
| White text | 2.16:1 |
Values
| HEX | #66BDCB |
| RGB | rgb(102, 189, 203) |
| HSL | hsl(188, 49%, 60%) |
| OKLCH | oklch(74.9% 0.086 209) |
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 #66BDCB | 2.16:1 | Fails | Lc -47.1 | Large or bold text, headings |
| Black text on #66BDCB | 9.70:1 | AAA | Lc 61.6 | Content text, not long reading |
| #66BDCB text on white | 2.16:1 | Fails | Lc 42.4 | Non-text elements, placeholder text |
| #66BDCB text on black | 9.70:1 | AAA | Lc -59.9 | 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
#F0F7F8
oklch(97.1% 0.008 207.1)
-
Step 100
100
#DFEDEF
oklch(93.6% 0.015 207.1)
-
Step 200
200
#C3DFE4
oklch(88.5% 0.03 209.6)
-
Step 300
300
#98CBD3
oklch(80.9% 0.054 208.1)
-
Step 400
400 (this color)
#66BDCB
oklch(74.9% 0.086 209)
-
Step 500
500
#009BAD
oklch(63.1% 0.109 209.2)
-
Step 600
600
#008291
oklch(55.5% 0.096 208.9)
-
Step 700
700
#006D7A
oklch(49% 0.084 209.1)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#004B54
oklch(37.8% 0.065 208.5)
-
Step 950
950
#012C32
oklch(26.9% 0.046 209.1)
#66BDCB 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) | #B0B7CC | 0.083 |
| Deuteranopia (no green cones) | #A0ABCB | 0.076 |
| Tritanopia (no blue cones) | #28C4C1 | 0.045 |
| Achromatopsia (no color) | #B0B0B0 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BDCB
#66BDCB
oklch(74.9% 0.086 209)
- #DF998E
#DF998E
oklch(74.9% 0.086 29.2)
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 #66BDCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.054
- Dark Turquoise #00CED1 ΔE 0.056
- Medium Turquoise #48D1CC ΔE 0.057
- Light Cornflower Blue #98C1D9 ΔE 0.059
- Light Grey Blue #9DBCD4 ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.063
- Topaz #13BBAF ΔE 0.064
- Pale Teal #82CBB2 ΔE 0.067
Use #66BDCB 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.