#66BCED
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76% 0.109 235.6), rgb(102, 188, 237).
Aa
Black text reads best on this color (9.98:1).
About this color
#66BCED is a medium-light, moderately saturated blue. In OKLCH its lightness is 76%, its chroma 0.109 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.036 away. Black text reads best on it, at 9.98:1.
| Hue family | Blues |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.98:1 |
| White text | 2.10:1 |
Values
| HEX | #66BCED |
| RGB | rgb(102, 188, 237) |
| HSL | hsl(202, 79%, 66%) |
| OKLCH | oklch(76% 0.109 235.6) |
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 #66BCED | 2.10:1 | Fails | Lc -45.6 | Large or bold text, headings |
| Black text on #66BCED | 9.98:1 | AAA | Lc 62.9 | Content text, not long reading |
| #66BCED text on white | 2.10:1 | Fails | Lc 41.0 | Non-text elements, placeholder text |
| #66BCED text on black | 9.98:1 | AAA | Lc -61.3 | 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 300.
-
Step 50
50
#EDF7FE
oklch(97.1% 0.014 238)
-
Step 100
100
#D7EEFC
oklch(93.6% 0.031 234.4)
-
Step 200
200
#B3E0FC
oklch(88.4% 0.061 235.7)
-
Step 300
300 (this color)
#66BCED
oklch(76% 0.109 235.6)
-
Step 400
400
#00ADF1
oklch(70.7% 0.151 235.7)
-
Step 500
500
#0094CF
oklch(63% 0.135 235.8)
-
Step 600
600
#007DAF
oklch(55.7% 0.119 235.4)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#66BCED 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) | #A5BBEF | 0.067 |
| Deuteranopia (no green cones) | #92ADEC | 0.056 |
| Tritanopia (no blue cones) | #00C9CC | 0.082 |
| Achromatopsia (no color) | #B3B3B3 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BCED
#66BCED
oklch(76% 0.109 235.6)
- #E79E6B
#E79E6B
oklch(76% 0.11 55.2)
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 #66BCED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.036
- Lightblue #7BC8F6 ΔE 0.041
- Deep Sky Blue #00BFFF ΔE 0.046
- Carolina Blue #8AB8FE ΔE 0.047
- Sky #82CAFC ΔE 0.051
- Bright Sky Blue #02CCFE ΔE 0.052
- Light Cornflower Blue #98C1D9 ΔE 0.061
- Light Sky Blue #87CEFA ΔE 0.062
Use #66BCED 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.