#66E8FC
Closest named color: Robin's Egg (#6DEDFD). oklch(86.6% 0.117 209), rgb(102, 232, 252).
Aa
Black text reads best on this color (14.51:1).
About this color
#66E8FC is a light, moderately saturated teal or cyan. In OKLCH its lightness is 87%, its chroma 0.117 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.015 away. Black text reads best on it, at 14.51:1.
| Hue family | Teals and cyans |
| Lightness | light (87%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 14.51:1 |
| White text | 1.44:1 |
Values
| HEX | #66E8FC |
| RGB | rgb(102, 232, 252) |
| HSL | hsl(188, 96%, 69%) |
| OKLCH | oklch(86.6% 0.117 209) |
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 #66E8FC | 1.44:1 | Fails | Lc -24.0 | Dividers and decoration only |
| Black text on #66E8FC | 14.51:1 | AAA | Lc 82.7 | Fine for body text |
| #66E8FC text on white | 1.44:1 | Fails | Lc 21.1 | Dividers and decoration only |
| #66E8FC text on black | 14.51:1 | AAA | Lc -82.3 | Fine for body text |
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 200.
-
Step 50
50
#E7FAFD
oklch(97.2% 0.02 208.1)
-
Step 100
100
#C9F3FA
oklch(93.7% 0.044 208.8)
-
Step 200
200 (this color)
#66E8FC
oklch(86.6% 0.117 209)
-
Step 300
300
#00D8F1
oklch(80.8% 0.14 209.5)
-
Step 400
400
#00B5C9
oklch(70.8% 0.122 208.7)
-
Step 500
500
#009BAD
oklch(63.1% 0.109 209.2)
-
Step 600
600
#008291
oklch(55.5% 0.096 208.9)
-
Step 700
700
#006D7A
oklch(49% 0.084 209.1)
-
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)
#66E8FC 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) | #D6E0FD | 0.112 |
| Deuteranopia (no green cones) | #BFCFFC | 0.102 |
| Tritanopia (no blue cones) | #00F2EE | 0.050 |
| Achromatopsia (no color) | #D6D6D6 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66E8FC
#66E8FC
oklch(86.6% 0.117 209)
- #FFC2B8
#FFC2B8
oklch(86.6% 0.072 29.2)
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 #66E8FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.015
- Robin Egg Blue #8AF1FE ΔE 0.040
- Bright Light Blue #26F7FD ΔE 0.045
- Robin's Egg Blue #98EFF9 ΔE 0.048
- Bright Cyan #41FDFE ΔE 0.057
- Cyan #00FFFF ΔE 0.064
- Bright Turquoise #0FFEF9 ΔE 0.065
- Aqua Blue #02D8E9 ΔE 0.065
Use #66E8FC 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.