#66BFCE
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.5% 0.088 209.7), rgb(102, 191, 206).
Aa
Black text reads best on this color (9.90:1).
About this color
#66BFCE is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.088 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.049 away. Black text reads best on it, at 9.90:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.90:1 |
| White text | 2.11:1 |
Values
| HEX | #66BFCE |
| RGB | rgb(102, 191, 206) |
| HSL | hsl(189, 51%, 60%) |
| OKLCH | oklch(75.5% 0.088 209.7) |
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 #66BFCE | 2.11:1 | Fails | Lc -46.0 | Large or bold text, headings |
| Black text on #66BFCE | 9.90:1 | AAA | Lc 62.6 | Content text, not long reading |
| #66BFCE text on white | 2.11:1 | Fails | Lc 41.4 | Non-text elements, placeholder text |
| #66BFCE text on black | 9.90:1 | AAA | Lc -60.9 | 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
#DEEDF0
oklch(93.6% 0.016 211)
-
Step 200
200
#C3DFE4
oklch(88.5% 0.03 209.6)
-
Step 300
300
#97CBD4
oklch(80.9% 0.055 209.3)
-
Step 400
400 (this color)
#66BFCE
oklch(75.5% 0.088 209.7)
-
Step 500
500
#009BAD
oklch(63.1% 0.109 209.2)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
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
#002C33
oklch(26.9% 0.047 211.1)
#66BFCE 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) | #B1B9CF | 0.083 |
| Deuteranopia (no green cones) | #A1ADCE | 0.076 |
| Tritanopia (no blue cones) | #23C6C3 | 0.047 |
| Achromatopsia (no color) | #B2B2B2 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BFCE
#66BFCE
oklch(75.5% 0.088 209.7)
- #E29B8F
#E29B8F
oklch(75.6% 0.088 29.9)
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 #66BFCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.049
- Dark Turquoise #00CED1 ΔE 0.053
- Medium Turquoise #48D1CC ΔE 0.053
- Light Cornflower Blue #98C1D9 ΔE 0.056
- Light Grey Blue #9DBCD4 ΔE 0.059
- Lightblue #7BC8F6 ΔE 0.064
- Sky Blue #87CEEB ΔE 0.065
- Pale Teal #82CBB2 ΔE 0.066
Use #66BFCE 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.