#66F3F5
Closest named color: Robin's Egg (#6DEDFD). oklch(88.9% 0.121 196.5), rgb(102, 243, 245).
Aa
Black text reads best on this color (15.70:1).
About this color
#66F3F5 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 89%, its chroma 0.121 and its hue 196°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.023 away. Black text reads best on it, at 15.70:1.
| Hue family | Teals and cyans |
| Lightness | light (89%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 15.70:1 |
| White text | 1.33:1 |
Values
| HEX | #66F3F5 |
| RGB | rgb(102, 243, 245) |
| HSL | hsl(181, 88%, 68%) |
| OKLCH | oklch(88.9% 0.121 196.5) |
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 #66F3F5 | 1.33:1 | Fails | Lc -18.7 | Dividers and decoration only |
| Black text on #66F3F5 | 15.70:1 | AAA | Lc 87.3 | Fine for body text |
| #66F3F5 text on white | 1.33:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #66F3F5 text on black | 15.70:1 | AAA | Lc -87.4 | 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
#E6FAFA
oklch(97% 0.021 196.8)
-
Step 100
100
#C8F4F4
oklch(93.6% 0.045 196.4)
-
Step 200
200 (this color)
#66F3F5
oklch(88.9% 0.121 196.5)
-
Step 300
300
#00DBDE
oklch(80.8% 0.138 196.5)
-
Step 400
400
#00B7BA
oklch(70.7% 0.12 196.9)
-
Step 500
500
#009D9F
oklch(63.1% 0.107 196.4)
-
Step 600
600
#008486
oklch(55.6% 0.095 196.7)
-
Step 700
700
#006F71
oklch(49.1% 0.084 197)
-
Step 800
800
#005B5C
oklch(42.7% 0.073 196.1)
-
Step 900
900
#004C4D
oklch(37.8% 0.064 196.3)
-
Step 950
950
#002D2E
oklch(27% 0.046 197.1)
#66F3F5 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) | #E4E8F5 | 0.126 |
| Deuteranopia (no green cones) | #CDD8F6 | 0.116 |
| Tritanopia (no blue cones) | #00FAF3 | 0.034 |
| Achromatopsia (no color) | #DFDFDF | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66F3F5
#66F3F5
oklch(88.9% 0.121 196.5)
- #FFCBCD
#FFCBCD
oklch(88.8% 0.059 15.7)
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 #66F3F5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.023
- Bright Light Blue #26F7FD ΔE 0.026
- Bright Cyan #41FDFE ΔE 0.028
- Robin Egg Blue #8AF1FE ΔE 0.032
- Bright Turquoise #0FFEF9 ΔE 0.037
- Cyan #00FFFF ΔE 0.038
- Bright Aqua #0BF9EA ΔE 0.040
- Robin's Egg Blue #98EFF9 ΔE 0.041
Use #66F3F5 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.