#42DCFD
Closest named color: Aqua Blue (#02D8E9). oklch(82.9% 0.132 215.7), rgb(66, 220, 253).
Aa
Black text reads best on this color (12.88:1).
About this color
#42DCFD is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.132 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.035 away. Black text reads best on it, at 12.88:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.88:1 |
| White text | 1.62:1 |
Values
| HEX | #42DCFD |
| RGB | rgb(66, 220, 253) |
| HSL | hsl(191, 98%, 63%) |
| OKLCH | oklch(82.9% 0.132 215.7) |
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 #42DCFD | 1.62:1 | Fails | Lc -31.2 | Non-text elements, placeholder text |
| Black text on #42DCFD | 12.88:1 | AAA | Lc 76.1 | Fine for body text |
| #42DCFD text on white | 1.62:1 | Fails | Lc 27.7 | Dividers and decoration only |
| #42DCFD text on black | 12.88:1 | AAA | Lc -75.3 | 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
#E9F9FD
oklch(97.1% 0.018 214.4)
-
Step 100
100
#CEF1FA
oklch(93.6% 0.038 215)
-
Step 200
200
#A1E6F8
oklch(88.5% 0.073 215.8)
-
Step 300
300 (this color)
#42DCFD
oklch(82.9% 0.132 215.7)
-
Step 400
400
#00B3D2
oklch(70.6% 0.125 216)
-
Step 500
500
#009AB4
oklch(63.2% 0.112 215.3)
-
Step 600
600
#008198
oklch(55.6% 0.099 216.1)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#004A58
oklch(37.7% 0.067 215.8)
-
Step 950
950
#002C35
oklch(27% 0.048 215.4)
#42DCFD 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) | #C5D5FF | 0.116 |
| Deuteranopia (no green cones) | #ACC3FD | 0.104 |
| Tritanopia (no blue cones) | #00E8E6 | 0.056 |
| Achromatopsia (no color) | #CBCBCB | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42DCFD
#42DCFD
oklch(82.9% 0.132 215.7)
- #FFB19C
#FFB19C
oklch(83% 0.097 35.7)
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 #42DCFD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.035
- Vivid Sky Blue #4CC9F0 ΔE 0.050
- Bright Sky Blue #02CCFE ΔE 0.051
- Sky Blue #87CEEB ΔE 0.055
- Light Sky Blue #87CEFA ΔE 0.056
- Robin's Egg #6DEDFD ΔE 0.057
- Lightblue #7BC8F6 ΔE 0.059
- Sky #82CAFC ΔE 0.061
Use #42DCFD 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.