#42DFDA
Closest named color: Turquoise (#40E0D0). oklch(82.4% 0.127 191.8), rgb(66, 223, 218).
Aa
Black text reads best on this color (12.79:1).
About this color
#42DFDA is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.127 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.016 away. Black text reads best on it, at 12.79:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 12.79:1 |
| White text | 1.64:1 |
Values
| HEX | #42DFDA |
| RGB | rgb(66, 223, 218) |
| HSL | hsl(178, 71%, 57%) |
| OKLCH | oklch(82.4% 0.127 191.8) |
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 #42DFDA | 1.64:1 | Fails | Lc -31.6 | Non-text elements, placeholder text |
| Black text on #42DFDA | 12.79:1 | AAA | Lc 75.8 | Fine for body text |
| #42DFDA text on white | 1.64:1 | Fails | Lc 28.0 | Dividers and decoration only |
| #42DFDA text on black | 12.79:1 | AAA | Lc -74.9 | 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
#E9F9F8
oklch(97% 0.017 192.4)
-
Step 100
100
#CFF2F0
oklch(93.6% 0.036 192.3)
-
Step 200
200
#A2E9E5
oklch(88.6% 0.071 191.5)
-
Step 300
300 (this color)
#42DFDA
oklch(82.4% 0.127 191.8)
-
Step 400
400
#00B8B4
oklch(70.7% 0.121 192)
-
Step 500
500
#009E9A
oklch(63.2% 0.109 191.6)
-
Step 600
600
#008581
oklch(55.7% 0.096 191.1)
-
Step 700
700
#00706D
oklch(49.2% 0.085 191.5)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#42DFDA 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) | #D2D4DA | 0.134 |
| Deuteranopia (no green cones) | #BBC3DB | 0.125 |
| Tritanopia (no blue cones) | #00E5DD | 0.019 |
| Achromatopsia (no color) | #CACACA | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42DFDA
#42DFDA
oklch(82.4% 0.127 191.8)
- #FFAAB4
#FFAAB4
oklch(82.3% 0.101 11.8)
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 #42DFDA, closest first.
No curated palette has a color within ΔE 0.04 of #42DFDA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.016
- Aqua Blue #02D8E9 ΔE 0.037
- Medium Turquoise #48D1CC ΔE 0.038
- Dark Turquoise #00CED1 ΔE 0.053
- Seafoam Blue #78D1B6 ΔE 0.056
- Aqua Marine #2EE8BB ΔE 0.058
- Robin's Egg #6DEDFD ΔE 0.065
- Tiffany Blue #94D2BD ΔE 0.066
Use #42DFDA 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.