#42E3F3
Closest named color: Aqua Blue (#02D8E9). oklch(84.2% 0.13 204.9), rgb(66, 227, 243).
Aa
Black text reads best on this color (13.51:1).
About this color
#42E3F3 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.130 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.037 away. Black text reads best on it, at 13.51:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 13.51:1 |
| White text | 1.55:1 |
Values
| HEX | #42E3F3 |
| RGB | rgb(66, 227, 243) |
| HSL | hsl(185, 88%, 61%) |
| OKLCH | oklch(84.2% 0.13 204.9) |
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 #42E3F3 | 1.55:1 | Fails | Lc -28.3 | Dividers and decoration only |
| Black text on #42E3F3 | 13.51:1 | AAA | Lc 78.8 | Fine for body text |
| #42E3F3 text on white | 1.55:1 | Fails | Lc 25.0 | Dividers and decoration only |
| #42E3F3 text on black | 13.51:1 | AAA | Lc -78.1 | 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
#E9F9FB
oklch(97.1% 0.017 205.8)
-
Step 100
100
#CEF2F6
oklch(93.7% 0.038 204.7)
-
Step 200
200
#A0E8F0
oklch(88.6% 0.072 204.7)
-
Step 300
300 (this color)
#42E3F3
oklch(84.2% 0.13 204.9)
-
Step 400
400
#00B6C4
oklch(70.8% 0.121 204.6)
-
Step 500
500
#009CA8
oklch(63.2% 0.108 204.4)
-
Step 600
600
#00838E
oklch(55.7% 0.095 205.2)
-
Step 700
700
#006E77
oklch(49.1% 0.084 204.7)
-
Step 800
800
#005A62
oklch(42.7% 0.073 205.3)
-
Step 900
900
#004B52
oklch(37.7% 0.064 205.5)
-
Step 950
950
#002D31
oklch(27.1% 0.046 204.1)
#42E3F3 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) | #D0DAF4 | 0.127 |
| Deuteranopia (no green cones) | #B8C7F4 | 0.119 |
| Tritanopia (no blue cones) | #00EDE8 | 0.038 |
| Achromatopsia (no color) | #CFCFCF | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E3F3
#42E3F3
oklch(84.2% 0.13 204.9)
- #FFB5AF
#FFB5AF
oklch(84.1% 0.087 24.3)
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 #42E3F3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.037
- Robin's Egg #6DEDFD ΔE 0.041
- Turquoise #40E0D0 ΔE 0.049
- Bright Light Blue #26F7FD ΔE 0.052
- Medium Turquoise #48D1CC ΔE 0.063
- Bright Aqua #0BF9EA ΔE 0.066
- Sky Blue #87CEEB ΔE 0.066
- Robin Egg Blue #8AF1FE ΔE 0.067
Use #42E3F3 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.