#66BEEF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.6% 0.11 235.1), rgb(102, 190, 239).
Aa
Black text reads best on this color (10.17:1).
About this color
#66BEEF is a medium-light, moderately saturated blue. In OKLCH its lightness is 77%, its chroma 0.110 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.032 away. Black text reads best on it, at 10.17:1.
| Hue family | Blues |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.17:1 |
| White text | 2.06:1 |
Values
| HEX | #66BEEF |
| RGB | rgb(102, 190, 239) |
| HSL | hsl(201, 81%, 67%) |
| OKLCH | oklch(76.6% 0.11 235.1) |
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 #66BEEF | 2.06:1 | Fails | Lc -44.6 | Non-text elements, placeholder text |
| Black text on #66BEEF | 10.17:1 | AAA | Lc 63.9 | Content text, not long reading |
| #66BEEF text on white | 2.06:1 | Fails | Lc 40.1 | Non-text elements, placeholder text |
| #66BEEF text on black | 10.17:1 | AAA | Lc -62.2 | 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
#D6EEFD
oklch(93.6% 0.033 235.2)
-
Step 200
200
#B3E0FC
oklch(88.4% 0.061 235.7)
-
Step 300
300 (this color)
#66BEEF
oklch(76.6% 0.11 235.1)
-
Step 400
400
#00ADF0
oklch(70.6% 0.15 235.3)
-
Step 500
500
#0095CE
oklch(63.2% 0.133 234.7)
-
Step 600
600
#007DAE
oklch(55.7% 0.118 234.9)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#66BEEF 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) | #A7BCF1 | 0.069 |
| Deuteranopia (no green cones) | #94AEEE | 0.059 |
| Tritanopia (no blue cones) | #00CBCE | 0.081 |
| Achromatopsia (no color) | #B4B4B4 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BEEF
#66BEEF
oklch(76.6% 0.11 235.1)
- #E9A06D
#E9A06D
oklch(76.6% 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 #66BEEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.032
- Lightblue #7BC8F6 ΔE 0.036
- Deep Sky Blue #00BFFF ΔE 0.045
- Sky #82CAFC ΔE 0.046
- Carolina Blue #8AB8FE ΔE 0.047
- Bright Sky Blue #02CCFE ΔE 0.049
- Light Sky Blue #87CEFA ΔE 0.057
- Sky Blue #87CEEB ΔE 0.059
Use #66BEEF 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.