#42D2FA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(80.5% 0.131 220.8), rgb(66, 210, 250).
Aa
Black text reads best on this color (11.83:1).
About this color
#42D2FA is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.131 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.025 away. Black text reads best on it, at 11.83:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.83:1 |
| White text | 1.77:1 |
Values
| HEX | #42D2FA |
| RGB | rgb(66, 210, 250) |
| HSL | hsl(193, 95%, 62%) |
| OKLCH | oklch(80.5% 0.131 220.8) |
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 #42D2FA | 1.77:1 | Fails | Lc -36.2 | Non-text elements, placeholder text |
| Black text on #42D2FA | 11.83:1 | AAA | Lc 71.6 | Content text, not long reading |
| #42D2FA text on white | 1.77:1 | Fails | Lc 32.3 | Non-text elements, placeholder text |
| #42D2FA text on black | 11.83:1 | AAA | Lc -70.4 | 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
#E9F8FE
oklch(97% 0.018 223.6)
-
Step 100
100
#CFF0FC
oklch(93.5% 0.038 221.8)
-
Step 200
200
#A3E5FB
oklch(88.5% 0.073 220.6)
-
Step 300
300 (this color)
#42D2FA
oklch(80.5% 0.131 220.8)
-
Step 400
400
#00B2D9
oklch(70.7% 0.13 221)
-
Step 500
500
#0099BA
oklch(63.2% 0.115 220.3)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C84
oklch(49.2% 0.09 220.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#00495B
oklch(37.6% 0.069 221.4)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#42D2FA 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) | #BACDFC | 0.107 |
| Deuteranopia (no green cones) | #A1BBFA | 0.095 |
| Tritanopia (no blue cones) | #00DFDF | 0.063 |
| Achromatopsia (no color) | #C2C2C2 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42D2FA
#42D2FA
oklch(80.5% 0.131 220.8)
- #FFA585
#FFA585
oklch(80.4% 0.116 40.3)
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 #42D2FA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.025
- Bright Sky Blue #02CCFE ΔE 0.027
- Aqua Blue #02D8E9 ΔE 0.038
- Lightblue #7BC8F6 ΔE 0.043
- Sky #82CAFC ΔE 0.049
- Light Sky Blue #87CEFA ΔE 0.050
- Sky Blue #87CEEB ΔE 0.050
- Deep Sky Blue #00BFFF ΔE 0.061
Use #42D2FA 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.