#42E6BF
Closest named color: Aqua Marine (#2EE8BB). oklch(83.2% 0.144 172.9), rgb(66, 230, 191).
Aa
Black text reads best on this color (13.30:1).
About this color
#42E6BF is a light, vivid teal or cyan. In OKLCH its lightness is 83%, its chroma 0.144 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Marine (#2EE8BB), ΔE 0.012 away. Black text reads best on it, at 13.30:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Aqua Marine (#2EE8BB) |
| Black text | 13.30:1 |
| White text | 1.57:1 |
Values
| HEX | #42E6BF |
| RGB | rgb(66, 230, 191) |
| HSL | hsl(166, 77%, 58%) |
| OKLCH | oklch(83.2% 0.144 172.9) |
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 #42E6BF | 1.57:1 | Fails | Lc -29.3 | Dividers and decoration only |
| Black text on #42E6BF | 13.30:1 | AAA | Lc 77.9 | Fine for body text |
| #42E6BF text on white | 1.57:1 | Fails | Lc 25.9 | Dividers and decoration only |
| #42E6BF text on black | 13.30:1 | AAA | Lc -77.2 | 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
#CFF4E7
oklch(93.7% 0.042 172.1)
-
Step 200
200
#A1EBD4
oklch(88.5% 0.08 173)
-
Step 300
300 (this color)
#42E6BF
oklch(83.2% 0.144 172.9)
-
Step 400
400
#00BB98
oklch(70.6% 0.136 172.9)
-
Step 500
500
#00A182
oklch(63.2% 0.122 172.6)
-
Step 600
600
#00876D
oklch(55.6% 0.107 172.9)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#005D4B
oklch(42.7% 0.081 173.5)
-
Step 900
900
#004E3E
oklch(37.8% 0.073 172.9)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#42E6BF 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) | #DFD7BD | 0.150 |
| Deuteranopia (no green cones) | #C9C7C2 | 0.144 |
| Tritanopia (no blue cones) | #00E8DB | 0.038 |
| Achromatopsia (no color) | #CECECE | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E6BF
#42E6BF
oklch(83.2% 0.144 172.9)
- #FFABCE
#FFABCE
oklch(83.2% 0.107 353.1)
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 #42E6BF, closest first.
No curated palette has a color within ΔE 0.04 of #42E6BF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Marine #2EE8BB ΔE 0.012
- Turquoise #40E0D0 ΔE 0.033
- Bright Teal #01F9C6 ΔE 0.050
- Light Teal #90E4C1 ΔE 0.055
- Emerald #06D6A0 ΔE 0.059
- Light Turquoise #7EF4CC ΔE 0.060
- Seafoam Blue #78D1B6 ΔE 0.060
- Aqua Green #12E193 ΔE 0.062
Use #42E6BF 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.