#42D4DF
Closest named color: Aqua Blue (#02D8E9). oklch(79.9% 0.121 202.5), rgb(66, 212, 223).
Aa
Black text reads best on this color (11.71:1).
About this color
#42D4DF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.121 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.019 away. Black text reads best on it, at 11.71:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 11.71:1 |
| White text | 1.79:1 |
Values
| HEX | #42D4DF |
| RGB | rgb(66, 212, 223) |
| HSL | hsl(184, 71%, 57%) |
| OKLCH | oklch(79.9% 0.121 202.5) |
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 #42D4DF | 1.79:1 | Fails | Lc -36.8 | Non-text elements, placeholder text |
| Black text on #42D4DF | 11.71:1 | AAA | Lc 71.1 | Content text, not long reading |
| #42D4DF text on white | 1.79:1 | Fails | Lc 32.8 | Non-text elements, placeholder text |
| #42D4DF text on black | 11.71:1 | AAA | Lc -69.9 | 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
#EAF9FA
oklch(97.1% 0.016 201.7)
-
Step 100
100
#D0F1F4
oklch(93.5% 0.035 203.3)
-
Step 200
200
#A4E7EC
oklch(88.5% 0.067 201.9)
-
Step 300
300 (this color)
#42D4DF
oklch(79.9% 0.121 202.5)
-
Step 400
400
#00B6C1
oklch(70.7% 0.12 202.5)
-
Step 500
500
#009CA6
oklch(63.1% 0.107 202.8)
-
Step 600
600
#00838B
oklch(55.5% 0.095 202.3)
-
Step 700
700
#006E75
oklch(49% 0.083 202.5)
-
Step 800
800
#005A60
oklch(42.6% 0.073 202.7)
-
Step 900
900
#004B50
oklch(37.6% 0.064 202.5)
-
Step 950
950
#002D30
oklch(27% 0.046 201.8)
#42D4DF 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) | #C4CBE0 | 0.121 |
| Deuteranopia (no green cones) | #ADBAE0 | 0.112 |
| Tritanopia (no blue cones) | #00DCD7 | 0.031 |
| Achromatopsia (no color) | #C1C1C1 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42D4DF
#42D4DF
oklch(79.9% 0.121 202.5)
- #FF9F9B
#FF9F9B
oklch(79.9% 0.115 22.5)
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 #42D4DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.019
- Medium Turquoise #48D1CC ΔE 0.026
- Dark Turquoise #00CED1 ΔE 0.032
- Vivid Sky Blue #4CC9F0 ΔE 0.045
- Turquoise #40E0D0 ΔE 0.046
- Bright Sky Blue #02CCFE ΔE 0.058
- Sky Blue #87CEEB ΔE 0.058
- Seafoam Blue #78D1B6 ΔE 0.061
Use #42D4DF 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.