#42E9C4
Closest named color: Aqua Marine (#2EE8BB). oklch(84.1% 0.144 174.2), rgb(66, 233, 196).
Aa
Black text reads best on this color (13.68:1).
About this color
#42E9C4 is a light, vivid teal or cyan. In OKLCH its lightness is 84%, its chroma 0.144 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Marine (#2EE8BB), ΔE 0.015 away. Black text reads best on it, at 13.68:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Aqua Marine (#2EE8BB) |
| Black text | 13.68:1 |
| White text | 1.53:1 |
Values
| HEX | #42E9C4 |
| RGB | rgb(66, 233, 196) |
| HSL | hsl(167, 79%, 59%) |
| OKLCH | oklch(84.1% 0.144 174.2) |
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 #42E9C4 | 1.53:1 | Fails | Lc -27.5 | Dividers and decoration only |
| Black text on #42E9C4 | 13.68:1 | AAA | Lc 79.5 | Fine for body text |
| #42E9C4 text on white | 1.53:1 | Fails | Lc 24.3 | Dividers and decoration only |
| #42E9C4 text on black | 13.68:1 | AAA | Lc -78.9 | 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
#E9FAF4
oklch(97.1% 0.02 172.8)
-
Step 100
100
#CEF4E8
oklch(93.7% 0.043 174.3)
-
Step 200
200
#A0EBD5
oklch(88.5% 0.081 174.1)
-
Step 300
300 (this color)
#42E9C4
oklch(84.1% 0.144 174.2)
-
Step 400
400
#00BB9A
oklch(70.7% 0.134 174)
-
Step 500
500
#00A084
oklch(63% 0.119 174.3)
-
Step 600
600
#00876F
oklch(55.6% 0.106 174.3)
-
Step 700
700
#00715D
oklch(49% 0.093 174.7)
-
Step 800
800
#005D4C
oklch(42.7% 0.081 174.6)
-
Step 900
900
#004E3F
oklch(37.8% 0.072 174.1)
-
Step 950
950
#002E25
oklch(26.9% 0.05 175.6)
#42E9C4 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) | #E1DAC2 | 0.150 |
| Deuteranopia (no green cones) | #CBCAC7 | 0.144 |
| Tritanopia (no blue cones) | #00ECDE | 0.034 |
| Achromatopsia (no color) | #D1D1D1 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E9C4
#42E9C4
oklch(84.1% 0.144 174.2)
- #FFB0CF
#FFB0CF
oklch(84.1% 0.099 354.2)
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 #42E9C4, closest first.
No curated palette has a color within ΔE 0.04 of #42E9C4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Marine #2EE8BB ΔE 0.015
- Turquoise #40E0D0 ΔE 0.035
- Bright Teal #01F9C6 ΔE 0.044
- Light Turquoise #7EF4CC ΔE 0.052
- Light Teal #90E4C1 ΔE 0.053
- Bright Aqua #0BF9EA ΔE 0.056
- Greenish Turquoise #00FBB0 ΔE 0.065
- Hospital Green #9BE5AA ΔE 0.065
Use #42E9C4 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.