#66BECB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.2% 0.087 208), rgb(102, 190, 203).
Aa
Black text reads best on this color (9.79:1).
About this color
#66BECB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.087 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.053 away. Black text reads best on it, at 9.79:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.79:1 |
| White text | 2.14:1 |
Values
| HEX | #66BECB |
| RGB | rgb(102, 190, 203) |
| HSL | hsl(188, 49%, 60%) |
| OKLCH | oklch(75.2% 0.087 208) |
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 #66BECB | 2.14:1 | Fails | Lc -46.6 | Large or bold text, headings |
| Black text on #66BECB | 9.79:1 | AAA | Lc 62.0 | Content text, not long reading |
| #66BECB text on white | 2.14:1 | Fails | Lc 41.9 | Non-text elements, placeholder text |
| #66BECB text on black | 9.79:1 | AAA | Lc -60.3 | 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 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
#C3DFE3
oklch(88.4% 0.03 207.1)
-
Step 300
300
#98CBD3
oklch(80.9% 0.054 208.1)
-
Step 400
400 (this color)
#66BECB
oklch(75.2% 0.087 208)
-
Step 500
500
#009BAC
oklch(63.1% 0.109 208.4)
-
Step 600
600
#008290
oklch(55.5% 0.095 208)
-
Step 700
700
#006E7A
oklch(49.2% 0.085 207.9)
-
Step 800
800
#005A64
oklch(42.8% 0.073 207.9)
-
Step 900
900
#004B53
oklch(37.7% 0.065 207)
-
Step 950
950
#012C32
oklch(26.9% 0.046 209.1)
#66BECB 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) | #B1B8CC | 0.084 |
| Deuteranopia (no green cones) | #A1ACCB | 0.077 |
| Tritanopia (no blue cones) | #27C5C2 | 0.044 |
| Achromatopsia (no color) | #B1B1B1 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BECB
#66BECB
oklch(75.2% 0.087 208)
- #E09A90
#E09A90
oklch(75.2% 0.086 28.3)
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 #66BECB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.053
- Dark Turquoise #00CED1 ΔE 0.054
- Medium Turquoise #48D1CC ΔE 0.054
- Light Cornflower Blue #98C1D9 ΔE 0.058
- Light Grey Blue #9DBCD4 ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.064
- Topaz #13BBAF ΔE 0.064
- Pale Teal #82CBB2 ΔE 0.065
Use #66BECB 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.