#42E4FB
Closest named color: Robin's Egg (#6DEDFD). oklch(84.7% 0.132 209.1), rgb(66, 228, 251).
Aa
Black text reads best on this color (13.72:1).
About this color
#42E4FB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 85%, its chroma 0.132 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.038 away. Black text reads best on it, at 13.72:1.
| Hue family | Teals and cyans |
| Lightness | light (85%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 13.72:1 |
| White text | 1.53:1 |
Values
| HEX | #42E4FB |
| RGB | rgb(66, 228, 251) |
| HSL | hsl(187, 96%, 62%) |
| OKLCH | oklch(84.7% 0.132 209.1) |
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 #42E4FB | 1.53:1 | Fails | Lc -27.4 | Dividers and decoration only |
| Black text on #42E4FB | 13.72:1 | AAA | Lc 79.6 | Fine for body text |
| #42E4FB text on white | 1.53:1 | Fails | Lc 24.1 | Dividers and decoration only |
| #42E4FB text on black | 13.72:1 | AAA | Lc -79.0 | 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
#CEF2F8
oklch(93.7% 0.038 208.8)
-
Step 200
200
#9FE7F3
oklch(88.5% 0.073 209)
-
Step 300
300 (this color)
#42E4FB
oklch(84.7% 0.132 209.1)
-
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
#008291
oklch(55.5% 0.096 208.9)
-
Step 700
700
#006D7A
oklch(49% 0.084 209.1)
-
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)
#42E4FB 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) | #CFDBFC | 0.125 |
| Deuteranopia (no green cones) | #B6C9FB | 0.114 |
| Tritanopia (no blue cones) | #00EFEB | 0.045 |
| Achromatopsia (no color) | #D1D1D1 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E4FB
#42E4FB
oklch(84.7% 0.132 209.1)
- #FFB9AD
#FFB9AD
oklch(84.8% 0.084 29.8)
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 #42E4FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.038
- Aqua Blue #02D8E9 ΔE 0.043
- Bright Light Blue #26F7FD ΔE 0.051
- Turquoise #40E0D0 ΔE 0.060
- Robin Egg Blue #8AF1FE ΔE 0.064
- Sky Blue #87CEEB ΔE 0.067
- Bright Cyan #41FDFE ΔE 0.068
- Bright Aqua #0BF9EA ΔE 0.070
Use #42E4FB 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.