#42E5FD
Closest named color: Robin's Egg (#6DEDFD). oklch(85% 0.133 209.6), rgb(66, 229, 253).
Aa
Black text reads best on this color (13.85:1).
About this color
#42E5FD is a light, moderately saturated teal or cyan. In OKLCH its lightness is 85%, its chroma 0.133 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.036 away. Black text reads best on it, at 13.85:1.
| Hue family | Teals and cyans |
| Lightness | light (85%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 13.85:1 |
| White text | 1.51:1 |
Values
| HEX | #42E5FD |
| RGB | rgb(66, 229, 253) |
| HSL | hsl(188, 98%, 63%) |
| OKLCH | oklch(85% 0.133 209.6) |
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 #42E5FD | 1.51:1 | Fails | Lc -26.7 | Dividers and decoration only |
| Black text on #42E5FD | 13.85:1 | AAA | Lc 80.2 | Fine for body text |
| #42E5FD text on white | 1.51:1 | Fails | Lc 23.6 | Dividers and decoration only |
| #42E5FD text on black | 13.85:1 | AAA | Lc -79.6 | 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 200.
-
Step 50
50
#E5FAFE
oklch(97.1% 0.023 210.4)
-
Step 100
100
#C5F4FC
oklch(93.7% 0.049 209)
-
Step 200
200 (this color)
#42E5FD
oklch(85% 0.133 209.6)
-
Step 300
300
#00D8F2
oklch(80.8% 0.14 210.1)
-
Step 400
400
#00B5CA
oklch(70.8% 0.122 209.4)
-
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)
#42E5FD 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) | #D0DDFE | 0.125 |
| Deuteranopia (no green cones) | #B6CAFD | 0.114 |
| Tritanopia (no blue cones) | #00F0EC | 0.046 |
| Achromatopsia (no color) | #D2D2D2 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E5FD
#42E5FD
oklch(85% 0.133 209.6)
- #FFBAAF
#FFBAAF
oklch(85% 0.082 29.1)
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 #42E5FD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.036
- Aqua Blue #02D8E9 ΔE 0.047
- Bright Light Blue #26F7FD ΔE 0.049
- Robin Egg Blue #8AF1FE ΔE 0.062
- Turquoise #40E0D0 ΔE 0.063
- Bright Cyan #41FDFE ΔE 0.066
- Sky Blue #87CEEB ΔE 0.068
- Bright Aqua #0BF9EA ΔE 0.069
Use #42E5FD 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.