#42E5E0
Closest named color: Turquoise (#40E0D0). oklch(84% 0.13 191.9), rgb(66, 229, 224).
Aa
Black text reads best on this color (13.51:1).
About this color
#42E5E0 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.130 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.023 away. Black text reads best on it, at 13.51:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 13.51:1 |
| White text | 1.55:1 |
Values
| HEX | #42E5E0 |
| RGB | rgb(66, 229, 224) |
| HSL | hsl(178, 76%, 58%) |
| OKLCH | oklch(84% 0.13 191.9) |
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 #42E5E0 | 1.55:1 | Fails | Lc -28.3 | Dividers and decoration only |
| Black text on #42E5E0 | 13.51:1 | AAA | Lc 78.8 | Fine for body text |
| #42E5E0 text on white | 1.55:1 | Fails | Lc 25.0 | Dividers and decoration only |
| #42E5E0 text on black | 13.51:1 | AAA | Lc -78.1 | 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
#E9F9F8
oklch(97% 0.017 192.4)
-
Step 100
100
#CEF2F0
oklch(93.5% 0.037 192.4)
-
Step 200
200
#A0E9E5
oklch(88.5% 0.073 191.6)
-
Step 300
300 (this color)
#42E5E0
oklch(84% 0.13 191.9)
-
Step 400
400
#00B8B4
oklch(70.7% 0.121 192)
-
Step 500
500
#009E9A
oklch(63.2% 0.109 191.6)
-
Step 600
600
#008582
oklch(55.7% 0.096 192)
-
Step 700
700
#006F6D
oklch(49% 0.084 192.6)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#42E5E0 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) | #D7D9E0 | 0.137 |
| Deuteranopia (no green cones) | #C0C8E1 | 0.129 |
| Tritanopia (no blue cones) | #00ECE3 | 0.021 |
| Achromatopsia (no color) | #CFCFCF | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E5E0
#42E5E0
oklch(84% 0.13 191.9)
- #FFB3BB
#FFB3BB
oklch(84.1% 0.089 12.2)
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 #42E5E0, closest first.
No curated palette has a color within ΔE 0.04 of #42E5E0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.023
- Aqua Blue #02D8E9 ΔE 0.047
- Bright Aqua #0BF9EA ΔE 0.052
- Robin's Egg #6DEDFD ΔE 0.053
- Bright Light Blue #26F7FD ΔE 0.053
- Medium Turquoise #48D1CC ΔE 0.055
- Aqua Marine #2EE8BB ΔE 0.057
- Light Teal #90E4C1 ΔE 0.063
Use #42E5E0 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.