#66F4E3
Closest named color: Bright Aqua (#0BF9EA). oklch(88.5% 0.125 184.4), rgb(102, 244, 227).
Aa
Black text reads best on this color (15.61:1).
About this color
#66F4E3 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 89%, its chroma 0.125 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Aqua (#0BF9EA), ΔE 0.029 away. Black text reads best on it, at 15.61:1.
| Hue family | Teals and cyans |
| Lightness | light (89%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Bright Aqua (#0BF9EA) |
| Black text | 15.61:1 |
| White text | 1.34:1 |
Values
| HEX | #66F4E3 |
| RGB | rgb(102, 244, 227) |
| HSL | hsl(173, 87%, 68%) |
| OKLCH | oklch(88.5% 0.125 184.4) |
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 #66F4E3 | 1.34:1 | Fails | Lc -19.1 | Dividers and decoration only |
| Black text on #66F4E3 | 15.61:1 | AAA | Lc 87.0 | Fine for body text |
| #66F4E3 text on white | 1.34:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #66F4E3 text on black | 15.61:1 | AAA | Lc -87.0 | 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
#E6FBF7
oklch(97.2% 0.023 183.2)
-
Step 100
100
#C8F5ED
oklch(93.6% 0.047 183.3)
-
Step 200
200 (this color)
#66F4E3
oklch(88.5% 0.125 184.4)
-
Step 300
300
#00DECC
oklch(81% 0.143 184.6)
-
Step 400
400
#00B9AA
oklch(70.6% 0.125 184.7)
-
Step 500
500
#009F92
oklch(63.2% 0.111 184.7)
-
Step 600
600
#00867A
oklch(55.7% 0.099 183.9)
-
Step 700
700
#007067
oklch(49% 0.086 185.2)
-
Step 800
800
#005C54
oklch(42.7% 0.075 184.7)
-
Step 900
900
#004D46
oklch(37.8% 0.067 184.5)
-
Step 950
950
#002E29
oklch(27.1% 0.048 183.6)
#66F4E3 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) | #E9E7E2 | 0.133 |
| Deuteranopia (no green cones) | #D3D7E5 | 0.126 |
| Tritanopia (no blue cones) | #00F9EF | 0.031 |
| Achromatopsia (no color) | #DEDEDE | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66F4E3
#66F4E3
oklch(88.5% 0.125 184.4)
- #FFC8D4
#FFC8D4
oklch(88.5% 0.064 3.9)
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 #66F4E3, closest first.
No curated palette has a color within ΔE 0.04 of #66F4E3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Aqua #0BF9EA ΔE 0.029
- Light Turquoise #7EF4CC ΔE 0.033
- Bright Cyan #41FDFE ΔE 0.038
- Bright Turquoise #0FFEF9 ΔE 0.038
- Bright Light Blue #26F7FD ΔE 0.039
- Cyan #00FFFF ΔE 0.044
- Aquamarine #7FFFD4 ΔE 0.046
- Light Aqua #8CFFDB ΔE 0.047
Use #66F4E3 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.