#42C4E3
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.3% 0.118 217.2), rgb(66, 196, 227).
Aa
Black text reads best on this color (10.23:1).
About this color
#42C4E3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.118 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.023 away. Black text reads best on it, at 10.23:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.23:1 |
| White text | 2.05:1 |
Values
| HEX | #42C4E3 |
| RGB | rgb(66, 196, 227) |
| HSL | hsl(192, 74%, 57%) |
| OKLCH | oklch(76.3% 0.118 217.2) |
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 #42C4E3 | 2.05:1 | Fails | Lc -44.1 | Non-text elements, placeholder text |
| Black text on #42C4E3 | 10.23:1 | AAA | Lc 64.3 | Content text, not long reading |
| #42C4E3 text on white | 2.05:1 | Fails | Lc 39.6 | Non-text elements, placeholder text |
| #42C4E3 text on black | 10.23:1 | AAA | Lc -62.7 | 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
#EAF8FC
oklch(97% 0.016 216.7)
-
Step 100
100
#D1F0F9
oklch(93.6% 0.035 217.1)
-
Step 200
200
#A8E5F6
oklch(88.6% 0.066 216.9)
-
Step 300
300 (this color)
#42C4E3
oklch(76.3% 0.118 217.2)
-
Step 400
400
#00B3D4
oklch(70.7% 0.127 217.3)
-
Step 500
500
#0099B6
oklch(63% 0.113 217.6)
-
Step 600
600
#008199
oklch(55.6% 0.099 216.9)
-
Step 700
700
#006C81
oklch(49% 0.088 217.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#42C4E3 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) | #B0BEE5 | 0.103 |
| Deuteranopia (no green cones) | #99AEE3 | 0.092 |
| Tritanopia (no blue cones) | #00CFCE | 0.053 |
| Achromatopsia (no color) | #B5B5B5 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42C4E3
#42C4E3
oklch(76.3% 0.118 217.2)
- #F3967B
#F3967B
oklch(76.3% 0.119 37)
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 #42C4E3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.023
- Bright Sky Blue #02CCFE ΔE 0.039
- Dark Turquoise #00CED1 ΔE 0.047
- Deep Sky Blue #00BFFF ΔE 0.049
- Aqua Blue #02D8E9 ΔE 0.054
- Lightblue #7BC8F6 ΔE 0.055
- Medium Turquoise #48D1CC ΔE 0.057
- Sky Blue #87CEEB ΔE 0.065
Use #42C4E3 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.