#66DFEE
Closest named color: Robin's Egg (#6DEDFD). oklch(84% 0.11 206.3), rgb(102, 223, 238).
Aa
Black text reads best on this color (13.35:1).
About this color
#66DFEE is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.110 and its hue 206°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.040 away. Black text reads best on it, at 13.35:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 13.35:1 |
| White text | 1.57:1 |
Values
| HEX | #66DFEE |
| RGB | rgb(102, 223, 238) |
| HSL | hsl(187, 80%, 67%) |
| OKLCH | oklch(84% 0.11 206.3) |
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 #66DFEE | 1.57:1 | Fails | Lc -29.2 | Dividers and decoration only |
| Black text on #66DFEE | 13.35:1 | AAA | Lc 77.9 | Fine for body text |
| #66DFEE text on white | 1.57:1 | Fails | Lc 25.8 | Dividers and decoration only |
| #66DFEE text on black | 13.35:1 | AAA | Lc -77.2 | 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 300.
-
Step 50
50
#EBF8FA
oklch(97% 0.014 207.9)
-
Step 100
100
#D3F0F4
oklch(93.5% 0.031 206.7)
-
Step 200
200
#AAE5ED
oklch(88.4% 0.061 206.5)
-
Step 300
300 (this color)
#66DFEE
oklch(84% 0.11 206.3)
-
Step 400
400
#00B5C6
oklch(70.6% 0.121 206.7)
-
Step 500
500
#009BAA
oklch(63% 0.108 206.9)
-
Step 600
600
#00838F
oklch(55.7% 0.095 206.1)
-
Step 700
700
#006E78
oklch(49.1% 0.084 205.8)
-
Step 800
800
#005A63
oklch(42.7% 0.073 206.6)
-
Step 900
900
#004B53
oklch(37.7% 0.065 207)
-
Step 950
950
#002D32
oklch(27.1% 0.046 206.3)
#66DFEE 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) | #CFD7EF | 0.108 |
| Deuteranopia (no green cones) | #BAC7EE | 0.100 |
| Tritanopia (no blue cones) | #00E7E3 | 0.046 |
| Achromatopsia (no color) | #CECECE | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66DFEE
#66DFEE
oklch(84% 0.11 206.3)
- #FFB5AD
#FFB5AD
oklch(84.1% 0.088 26)
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 #66DFEE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.040
- Aqua Blue #02D8E9 ΔE 0.045
- Sky Blue #87CEEB ΔE 0.049
- Turquoise #40E0D0 ΔE 0.052
- Light Sky Blue #87CEFA ΔE 0.059
- Celeste #A8DADC ΔE 0.060
- Robin Egg Blue #8AF1FE ΔE 0.061
- Medium Turquoise #48D1CC ΔE 0.061
Use #66DFEE 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.