#42E1BF
Closest named color: Aqua Marine (#2EE8BB). oklch(82% 0.139 175), rgb(66, 225, 191).
Aa
Black text reads best on this color (12.75:1).
About this color
#42E1BF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.139 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Marine (#2EE8BB), ΔE 0.023 away. Black text reads best on it, at 12.75:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Aqua Marine (#2EE8BB) |
| Black text | 12.75:1 |
| White text | 1.64:1 |
Values
| HEX | #42E1BF |
| RGB | rgb(66, 225, 191) |
| HSL | hsl(167, 73%, 57%) |
| OKLCH | oklch(82% 0.139 175) |
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 #42E1BF | 1.64:1 | Fails | Lc -31.8 | Non-text elements, placeholder text |
| Black text on #42E1BF | 12.75:1 | AAA | Lc 75.6 | Fine for body text |
| #42E1BF text on white | 1.64:1 | Fails | Lc 28.2 | Dividers and decoration only |
| #42E1BF text on black | 12.75:1 | AAA | Lc -74.7 | 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
#E9FAF5
oklch(97.1% 0.019 176.5)
-
Step 100
100
#CFF3E8
oklch(93.5% 0.04 175)
-
Step 200
200
#A2EAD6
oklch(88.4% 0.077 175.2)
-
Step 300
300 (this color)
#42E1BF
oklch(82% 0.139 175)
-
Step 400
400
#00BB9C
oklch(70.7% 0.133 175.1)
-
Step 500
500
#00A085
oklch(63% 0.119 175)
-
Step 600
600
#008770
oklch(55.7% 0.105 175.1)
-
Step 700
700
#00715E
oklch(49% 0.092 175.6)
-
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)
#42E1BF 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) | #D9D3BD | 0.144 |
| Deuteranopia (no green cones) | #C4C3C2 | 0.139 |
| Tritanopia (no blue cones) | #00E4D7 | 0.032 |
| Achromatopsia (no color) | #CACACA | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E1BF
#42E1BF
oklch(82% 0.139 175)
- #FFA5C8
#FFA5C8
oklch(82.1% 0.114 355)
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 #42E1BF, closest first.
No curated palette has a color within ΔE 0.04 of #42E1BF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Marine #2EE8BB ΔE 0.023
- Turquoise #40E0D0 ΔE 0.025
- Seafoam Blue #78D1B6 ΔE 0.050
- Emerald #06D6A0 ΔE 0.052
- Medium Aquamarine #66CDAA ΔE 0.054
- Medium Turquoise #48D1CC ΔE 0.054
- Light Teal #90E4C1 ΔE 0.058
- Aqua Green #12E193 ΔE 0.064
Use #42E1BF 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.