#42E5CE
Closest named color: Turquoise (#40E0D0). oklch(83.4% 0.135 181.3), rgb(66, 229, 206).
Aa
Black text reads best on this color (13.33:1).
About this color
#42E5CE is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.135 and its hue 181°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.015 away. Black text reads best on it, at 13.33:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 13.33:1 |
| White text | 1.57:1 |
Values
| HEX | #42E5CE |
| RGB | rgb(66, 229, 206) |
| HSL | hsl(172, 76%, 58%) |
| OKLCH | oklch(83.4% 0.135 181.3) |
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 #42E5CE | 1.57:1 | Fails | Lc -29.2 | Dividers and decoration only |
| Black text on #42E5CE | 13.33:1 | AAA | Lc 78.0 | Fine for body text |
| #42E5CE text on white | 1.57:1 | Fails | Lc 25.8 | Dividers and decoration only |
| #42E5CE text on black | 13.33:1 | AAA | Lc -77.3 | 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
#E9FAF6
oklch(97.1% 0.019 180.3)
-
Step 100
100
#CFF3EB
oklch(93.6% 0.039 180.5)
-
Step 200
200
#A1EADC
oklch(88.5% 0.075 181.2)
-
Step 300
300 (this color)
#42E5CE
oklch(83.4% 0.135 181.3)
-
Step 400
400
#00BAA5
oklch(70.7% 0.128 180.9)
-
Step 500
500
#009F8E
oklch(63% 0.113 181.8)
-
Step 600
600
#008677
oklch(55.6% 0.1 181.4)
-
Step 700
700
#007164
oklch(49.2% 0.089 181.2)
-
Step 800
800
#005C52
oklch(42.6% 0.076 182.2)
-
Step 900
900
#004D44
oklch(37.7% 0.068 181.7)
-
Step 950
950
#002E28
oklch(27% 0.049 181.5)
#42E5CE 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) | #DBD8CD | 0.143 |
| Deuteranopia (no green cones) | #C4C7D0 | 0.136 |
| Tritanopia (no blue cones) | #00E9DE | 0.023 |
| Achromatopsia (no color) | #CECECE | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E5CE
#42E5CE
oklch(83.4% 0.135 181.3)
- #FFAEC4
#FFAEC4
oklch(83.4% 0.098 1.7)
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 #42E5CE, closest first.
No curated palette has a color within ΔE 0.04 of #42E5CE.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.015
- Aqua Marine #2EE8BB ΔE 0.032
- Light Teal #90E4C1 ΔE 0.054
- Bright Aqua #0BF9EA ΔE 0.056
- Medium Turquoise #48D1CC ΔE 0.056
- Seafoam Blue #78D1B6 ΔE 0.058
- Bright Teal #01F9C6 ΔE 0.061
- Light Turquoise #7EF4CC ΔE 0.061
Use #42E5CE 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.