#66B4E2
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.8% 0.102 236.3), rgb(102, 180, 226).
Aa
Black text reads best on this color (9.19:1).
About this color
#66B4E2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.102 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.055 away. Black text reads best on it, at 9.19:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.19:1 |
| White text | 2.28:1 |
Values
| HEX | #66B4E2 |
| RGB | rgb(102, 180, 226) |
| HSL | hsl(202, 68%, 64%) |
| OKLCH | oklch(73.8% 0.102 236.3) |
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 #66B4E2 | 2.28:1 | Fails | Lc -49.7 | Large or bold text, headings |
| Black text on #66B4E2 | 9.19:1 | AAA | Lc 59.1 | Large or bold text, headings |
| #66B4E2 text on white | 2.28:1 | Fails | Lc 44.9 | Non-text elements, placeholder text |
| #66B4E2 text on black | 9.19:1 | AAA | Lc -57.2 | 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
#F0F6FA
oklch(97% 0.008 236.6)
-
Step 100
100
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C4DDEE
oklch(88.4% 0.036 237.6)
-
Step 300
300
#99C8E5
oklch(81% 0.064 235.7)
-
Step 400
400 (this color)
#66B4E2
oklch(73.8% 0.102 236.3)
-
Step 500
500
#1994CD
oklch(63.1% 0.13 236.1)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006894
oklch(49% 0.106 236.4)
-
Step 800
800
#00557A
oklch(42.5% 0.092 236.4)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#042A3D
oklch(27% 0.054 235.8)
#66B4E2 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) | #9FB3E4 | 0.063 |
| Deuteranopia (no green cones) | #8DA6E1 | 0.052 |
| Tritanopia (no blue cones) | #00C0C3 | 0.080 |
| Achromatopsia (no color) | #ABABAB | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B4E2
#66B4E2
oklch(73.8% 0.102 236.3)
- #DB9969
#DB9969
oklch(73.7% 0.102 56.4)
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 #66B4E2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.055
- Vivid Sky Blue #4CC9F0 ΔE 0.056
- Carolina Blue #8AB8FE ΔE 0.058
- Lightblue #7BC8F6 ΔE 0.062
- Light Grey Blue #9DBCD4 ΔE 0.069
- Light Cornflower Blue #98C1D9 ΔE 0.070
- Turquoise Blue #06B1C4 ΔE 0.070
- Bright Sky Blue #02CCFE ΔE 0.071
Use #66B4E2 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.