#42CAFF
Closest named color: Bright Sky Blue (#02CCFE). oklch(78.9% 0.136 228.8), rgb(66, 202, 255).
Aa
Black text reads best on this color (11.12:1).
About this color
#42CAFF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 79%, its chroma 0.136 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Sky Blue (#02CCFE), ΔE 0.017 away. Black text reads best on it, at 11.12:1.
| Hue family | Teals and cyans |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Bright Sky Blue (#02CCFE) |
| Black text | 11.12:1 |
| White text | 1.88:1 |
Values
| HEX | #42CAFF |
| RGB | rgb(66, 202, 255) |
| HSL | hsl(197, 100%, 63%) |
| OKLCH | oklch(78.9% 0.136 228.8) |
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 #42CAFF | 1.88:1 | Fails | Lc -39.7 | Non-text elements, placeholder text |
| Black text on #42CAFF | 11.12:1 | AAA | Lc 68.4 | Content text, not long reading |
| #42CAFF text on white | 1.88:1 | Fails | Lc 35.4 | Non-text elements, placeholder text |
| #42CAFF text on black | 11.12:1 | AAA | Lc -67.1 | 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
#EAF8FF
oklch(97.1% 0.018 229)
-
Step 100
100
#D0F0FF
oklch(93.7% 0.039 227.7)
-
Step 200
200
#A8E3FF
oklch(88.5% 0.071 228.9)
-
Step 300
300 (this color)
#42CAFF
oklch(78.9% 0.136 228.8)
-
Step 400
400
#00B0E5
oklch(70.8% 0.139 228.7)
-
Step 500
500
#0097C5
oklch(63.2% 0.124 228.7)
-
Step 600
600
#007EA6
oklch(55.5% 0.11 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#004861
oklch(37.6% 0.075 229.8)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#42CAFF 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) | #AEC7FF | 0.096 |
| Deuteranopia (no green cones) | #95B5FE | 0.083 |
| Tritanopia (no blue cones) | #00D9DC | 0.077 |
| Achromatopsia (no color) | #BDBDBD | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42CAFF
#42CAFF
oklch(78.9% 0.136 228.8)
- #FF9F6A
#FF9F6A
oklch(79% 0.134 48.9)
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 #42CAFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Sky Blue #02CCFE ΔE 0.017
- Vivid Sky Blue #4CC9F0 ΔE 0.021
- Deep Sky Blue #00BFFF ΔE 0.038
- Lightblue #7BC8F6 ΔE 0.040
- Sky #82CAFC ΔE 0.047
- Light Sky Blue #87CEFA ΔE 0.055
- Aqua Blue #02D8E9 ΔE 0.059
- Sky Blue #87CEEB ΔE 0.060
Use #42CAFF 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.