#42E0B9
Closest named color: Aqua Marine (#2EE8BB). oklch(81.6% 0.141 172.4), rgb(66, 224, 185).
Aa
Black text reads best on this color (12.59:1).
About this color
#42E0B9 is a light, vivid teal or cyan. In OKLCH its lightness is 82%, its chroma 0.141 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Marine (#2EE8BB), ΔE 0.022 away. Black text reads best on it, at 12.59:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Aqua Marine (#2EE8BB) |
| Black text | 12.59:1 |
| White text | 1.66:1 |
Values
| HEX | #42E0B9 |
| RGB | rgb(66, 224, 185) |
| HSL | hsl(165, 72%, 57%) |
| OKLCH | oklch(81.6% 0.141 172.4) |
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 #42E0B9 | 1.66:1 | Fails | Lc -32.6 | Non-text elements, placeholder text |
| Black text on #42E0B9 | 12.59:1 | AAA | Lc 74.9 | Content text, not long reading |
| #42E0B9 text on white | 1.66:1 | Fails | Lc 28.9 | Dividers and decoration only |
| #42E0B9 text on black | 12.59:1 | AAA | Lc -74.0 | Content text, not long reading |
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
#EAFAF4
oklch(97.2% 0.019 171.5)
-
Step 100
100
#CFF3E7
oklch(93.5% 0.041 173.3)
-
Step 200
200
#A3EBD4
oklch(88.6% 0.079 172.5)
-
Step 300
300 (this color)
#42E0B9
oklch(81.6% 0.141 172.4)
-
Step 400
400
#00BB97
oklch(70.6% 0.136 172.4)
-
Step 500
500
#00A181
oklch(63.2% 0.122 172)
-
Step 600
600
#00876C
oklch(55.5% 0.108 172.1)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#004E3D
oklch(37.8% 0.073 171.8)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#42E0B9 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) | #D9D1B7 | 0.146 |
| Deuteranopia (no green cones) | #C4C2BC | 0.140 |
| Tritanopia (no blue cones) | #00E2D5 | 0.038 |
| Achromatopsia (no color) | #C8C8C8 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E0B9
#42E0B9
oklch(81.6% 0.141 172.4)
- #FFA2CA
#FFA2CA
oklch(81.6% 0.12 352.7)
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 #42E0B9, closest first.
No curated palette has a color within ΔE 0.04 of #42E0B9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Marine #2EE8BB ΔE 0.022
- Turquoise #40E0D0 ΔE 0.032
- Emerald #06D6A0 ΔE 0.045
- Seafoam Blue #78D1B6 ΔE 0.050
- Medium Aquamarine #66CDAA ΔE 0.051
- Aqua Green #12E193 ΔE 0.057
- Medium Turquoise #48D1CC ΔE 0.057
- Light Teal #90E4C1 ΔE 0.061
Use #42E0B9 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.