#42E2F9
Closest named color: Aqua Blue (#02D8E9). oklch(84.2% 0.131 209.3), rgb(66, 226, 249).
Aa
Black text reads best on this color (13.47:1).
About this color
#42E2F9 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.131 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.038 away. Black text reads best on it, at 13.47:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 13.47:1 |
| White text | 1.55:1 |
Values
| HEX | #42E2F9 |
| RGB | rgb(66, 226, 249) |
| HSL | hsl(188, 94%, 62%) |
| OKLCH | oklch(84.2% 0.131 209.3) |
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 #42E2F9 | 1.55:1 | Fails | Lc -28.5 | Dividers and decoration only |
| Black text on #42E2F9 | 13.47:1 | AAA | Lc 78.6 | Fine for body text |
| #42E2F9 text on white | 1.55:1 | Fails | Lc 25.2 | Dividers and decoration only |
| #42E2F9 text on black | 13.47:1 | AAA | Lc -77.9 | 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
#E9F9FC
oklch(97.1% 0.017 210.2)
-
Step 100
100
#CEF1F8
oklch(93.5% 0.038 211.1)
-
Step 200
200
#A0E7F3
oklch(88.5% 0.072 209.1)
-
Step 300
300 (this color)
#42E2F9
oklch(84.2% 0.131 209.3)
-
Step 400
400
#00B5C9
oklch(70.8% 0.122 208.7)
-
Step 500
500
#009BAD
oklch(63.1% 0.109 209.2)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#004B54
oklch(37.8% 0.065 208.5)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#42E2F9 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) | #CEDAFA | 0.125 |
| Deuteranopia (no green cones) | #B4C7F9 | 0.113 |
| Tritanopia (no blue cones) | #00EDE9 | 0.045 |
| Achromatopsia (no color) | #CFCFCF | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E2F9
#42E2F9
oklch(84.2% 0.131 209.3)
- #FFB6AA
#FFB6AA
oklch(84.2% 0.087 29.5)
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 #42E2F9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.038
- Robin's Egg #6DEDFD ΔE 0.042
- Bright Light Blue #26F7FD ΔE 0.056
- Turquoise #40E0D0 ΔE 0.058
- Sky Blue #87CEEB ΔE 0.063
- Vivid Sky Blue #4CC9F0 ΔE 0.067
- Light Sky Blue #87CEFA ΔE 0.068
- Robin Egg Blue #8AF1FE ΔE 0.068
Use #42E2F9 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.