#66D7F1
Closest named color: Sky Blue (#87CEEB). oklch(82.3% 0.108 215.1), rgb(102, 215, 241).
Aa
Black text reads best on this color (12.55:1).
About this color
#66D7F1 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.108 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Sky Blue (#87CEEB), ΔE 0.033 away. Black text reads best on it, at 12.55:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Sky Blue (#87CEEB) |
| Black text | 12.55:1 |
| White text | 1.67:1 |
Values
| HEX | #66D7F1 |
| RGB | rgb(102, 215, 241) |
| HSL | hsl(191, 83%, 67%) |
| OKLCH | oklch(82.3% 0.108 215.1) |
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 #66D7F1 | 1.67:1 | Fails | Lc -33.0 | Non-text elements, placeholder text |
| Black text on #66D7F1 | 12.55:1 | AAA | Lc 74.6 | Content text, not long reading |
| #66D7F1 text on white | 1.67:1 | Fails | Lc 29.3 | Dividers and decoration only |
| #66D7F1 text on black | 12.55:1 | AAA | Lc -73.6 | 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
#EBF8FC
oklch(97.1% 0.015 218)
-
Step 100
100
#D3F0F7
oklch(93.6% 0.032 213.9)
-
Step 200
200
#ACE4F2
oklch(88.5% 0.06 214.8)
-
Step 300
300 (this color)
#66D7F1
oklch(82.3% 0.108 215.1)
-
Step 400
400
#00B3D1
oklch(70.6% 0.125 215.4)
-
Step 500
500
#009AB3
oklch(63.1% 0.111 214.6)
-
Step 600
600
#008197
oklch(55.5% 0.098 215.2)
-
Step 700
700
#006D7F
oklch(49.2% 0.087 214.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#004A58
oklch(37.7% 0.067 215.8)
-
Step 950
950
#002C35
oklch(27% 0.048 215.4)
#66D7F1 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) | #C5D1F3 | 0.098 |
| Deuteranopia (no green cones) | #B0C1F1 | 0.089 |
| Tritanopia (no blue cones) | #00E1DF | 0.056 |
| Achromatopsia (no color) | #C8C8C8 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D7F1
#66D7F1
oklch(82.3% 0.108 215.1)
- #FFAE99
#FFAE99
oklch(82.4% 0.1 35.2)
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 #66D7F1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sky Blue #87CEEB ΔE 0.033
- Aqua Blue #02D8E9 ΔE 0.040
- Light Sky Blue #87CEFA ΔE 0.041
- Vivid Sky Blue #4CC9F0 ΔE 0.045
- Lightblue #7BC8F6 ΔE 0.045
- Sky #82CAFC ΔE 0.048
- Bright Sky Blue #02CCFE ΔE 0.057
- Medium Turquoise #48D1CC ΔE 0.059
Use #66D7F1 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.