#42E3C5
Closest named color: Turquoise (#40E0D0). oklch(82.7% 0.137 177.3), rgb(66, 227, 197).
Aa
Black text reads best on this color (13.02:1).
About this color
#42E3C5 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.137 and its hue 177°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.020 away. Black text reads best on it, at 13.02:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 13.02:1 |
| White text | 1.61:1 |
Values
| HEX | #42E3C5 |
| RGB | rgb(66, 227, 197) |
| HSL | hsl(169, 74%, 57%) |
| OKLCH | oklch(82.7% 0.137 177.3) |
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 #42E3C5 | 1.61:1 | Fails | Lc -30.6 | Non-text elements, placeholder text |
| Black text on #42E3C5 | 13.02:1 | AAA | Lc 76.7 | Fine for body text |
| #42E3C5 text on white | 1.61:1 | Fails | Lc 27.1 | Dividers and decoration only |
| #42E3C5 text on black | 13.02:1 | AAA | Lc -75.9 | 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
#E9FAF5
oklch(97.1% 0.019 176.5)
-
Step 100
100
#CFF3E9
oklch(93.6% 0.04 176.8)
-
Step 200
200
#A2EAD8
oklch(88.5% 0.076 177.1)
-
Step 300
300 (this color)
#42E3C5
oklch(82.7% 0.137 177.3)
-
Step 400
400
#00BB9F
oklch(70.8% 0.132 176.8)
-
Step 500
500
#00A088
oklch(63.1% 0.117 177)
-
Step 600
600
#008772
oklch(55.7% 0.104 176.6)
-
Step 700
700
#007160
oklch(49.1% 0.091 177.4)
-
Step 800
800
#005D4E
oklch(42.8% 0.079 176.7)
-
Step 900
900
#004D41
oklch(37.6% 0.069 177.7)
-
Step 950
950
#002E26
oklch(26.9% 0.05 177.5)
#42E3C5 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) | #DAD5C4 | 0.144 |
| Deuteranopia (no green cones) | #C4C5C7 | 0.137 |
| Tritanopia (no blue cones) | #00E6DA | 0.028 |
| Achromatopsia (no color) | #CCCCCC | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E3C5
#42E3C5
oklch(82.7% 0.137 177.3)
- #FFA9C7
#FFA9C7
oklch(82.7% 0.107 357.2)
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 #42E3C5, closest first.
No curated palette has a color within ΔE 0.04 of #42E3C5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.020
- Aqua Marine #2EE8BB ΔE 0.024
- Seafoam Blue #78D1B6 ΔE 0.053
- Medium Turquoise #48D1CC ΔE 0.055
- Light Teal #90E4C1 ΔE 0.055
- Medium Aquamarine #66CDAA ΔE 0.060
- Emerald #06D6A0 ΔE 0.061
- Bright Teal #01F9C6 ΔE 0.061
Use #42E3C5 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.