#66BBCE
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74.6% 0.087 214), rgb(102, 187, 206).
Aa
Black text reads best on this color (9.56:1).
About this color
#66BBCE is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.087 and its hue 214°. 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 9.56:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.56:1 |
| White text | 2.19:1 |
Values
| HEX | #66BBCE |
| RGB | rgb(102, 187, 206) |
| HSL | hsl(191, 51%, 60%) |
| OKLCH | oklch(74.6% 0.087 214) |
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 #66BBCE | 2.19:1 | Fails | Lc -47.8 | Large or bold text, headings |
| Black text on #66BBCE | 9.56:1 | AAA | Lc 60.9 | Content text, not long reading |
| #66BBCE text on white | 2.19:1 | Fails | Lc 43.0 | Non-text elements, placeholder text |
| #66BBCE text on black | 9.56:1 | AAA | Lc -59.1 | 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
#DFEDF0
oklch(93.7% 0.015 212)
-
Step 200
200
#C4DFE5
oklch(88.6% 0.03 212.6)
-
Step 300
300
#99CAD6
oklch(80.9% 0.054 214.4)
-
Step 400
400 (this color)
#66BBCE
oklch(74.6% 0.087 214)
-
Step 500
500
#019AB2
oklch(63.1% 0.111 213.9)
-
Step 600
600
#008196
oklch(55.5% 0.098 214.4)
-
Step 700
700
#006D7E
oklch(49.1% 0.086 213.3)
-
Step 800
800
#005968
oklch(42.7% 0.075 214.2)
-
Step 900
900
#004A57
oklch(37.6% 0.066 214.5)
-
Step 950
950
#022C34
oklch(27% 0.046 213.8)
#66BBCE 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) | #ADB6CF | 0.079 |
| Deuteranopia (no green cones) | #9DAACE | 0.072 |
| Tritanopia (no blue cones) | #25C3C1 | 0.050 |
| Achromatopsia (no color) | #AFAFAF | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BBCE
#66BBCE
oklch(74.6% 0.087 214)
- #DE9988
#DE9988
oklch(74.6% 0.087 34.4)
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 #66BBCE, 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
- Light Cornflower Blue #98C1D9 ΔE 0.059
- Turquoise Blue #06B1C4 ΔE 0.060
- Light Grey Blue #9DBCD4 ΔE 0.060
- Dark Turquoise #00CED1 ΔE 0.061
- Medium Turquoise #48D1CC ΔE 0.064
- Lightblue #7BC8F6 ΔE 0.067
- Topaz #13BBAF ΔE 0.068
Use #66BBCE 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.