#42E4ED
Closest named color: Aqua Blue (#02D8E9). oklch(84.2% 0.129 200.6), rgb(66, 228, 237).
Aa
Black text reads best on this color (13.55:1).
About this color
#42E4ED is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.129 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.039 away. Black text reads best on it, at 13.55:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 13.55:1 |
| White text | 1.54:1 |
Values
| HEX | #42E4ED |
| RGB | rgb(66, 228, 237) |
| HSL | hsl(183, 83%, 59%) |
| OKLCH | oklch(84.2% 0.129 200.6) |
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 #42E4ED | 1.54:1 | Fails | Lc -28.1 | Dividers and decoration only |
| Black text on #42E4ED | 13.55:1 | AAA | Lc 78.9 | Fine for body text |
| #42E4ED text on white | 1.54:1 | Fails | Lc 24.8 | Dividers and decoration only |
| #42E4ED text on black | 13.55:1 | AAA | Lc -78.3 | 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 300.
-
Step 50
50
#E9F9FA
oklch(97.1% 0.017 201.4)
-
Step 100
100
#CEF2F4
oklch(93.6% 0.037 200.7)
-
Step 200
200
#A0E8EC
oklch(88.5% 0.072 200.3)
-
Step 300
300 (this color)
#42E4ED
oklch(84.2% 0.129 200.6)
-
Step 400
400
#00B6BF
oklch(70.6% 0.12 201.1)
-
Step 500
500
#009CA4
oklch(63% 0.107 201.2)
-
Step 600
600
#00838A
oklch(55.5% 0.094 201.4)
-
Step 700
700
#006F74
oklch(49.2% 0.084 200.3)
-
Step 800
800
#005B5F
oklch(42.8% 0.073 200)
-
Step 900
900
#004B4F
oklch(37.5% 0.064 200.9)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#42E4ED 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) | #D3DAEE | 0.131 |
| Deuteranopia (no green cones) | #BBC8EE | 0.122 |
| Tritanopia (no blue cones) | #00EDE6 | 0.032 |
| Achromatopsia (no color) | #D0D0D0 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E4ED
#42E4ED
oklch(84.2% 0.129 200.6)
- #FFB5B3
#FFB5B3
oklch(84.2% 0.087 20.8)
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 #42E4ED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.039
- Turquoise #40E0D0 ΔE 0.040
- Robin's Egg #6DEDFD ΔE 0.042
- Bright Light Blue #26F7FD ΔE 0.050
- Bright Aqua #0BF9EA ΔE 0.059
- Medium Turquoise #48D1CC ΔE 0.060
- Bright Cyan #41FDFE ΔE 0.067
- Robin Egg Blue #8AF1FE ΔE 0.067
Use #42E4ED 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.