#42EEFF
Closest named color: Robin's Egg (#6DEDFD). oklch(87.2% 0.136 205), rgb(66, 238, 255).
Aa
Black text reads best on this color (14.90:1).
About this color
#42EEFF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 87%, its chroma 0.136 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.023 away. Black text reads best on it, at 14.90:1.
| Hue family | Teals and cyans |
| Lightness | light (87%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 14.90:1 |
| White text | 1.40:1 |
Values
| HEX | #42EEFF |
| RGB | rgb(66, 238, 255) |
| HSL | hsl(185, 100%, 63%) |
| OKLCH | oklch(87.2% 0.136 205) |
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 #42EEFF | 1.40:1 | Fails | Lc -22.0 | Dividers and decoration only |
| Black text on #42EEFF | 14.90:1 | AAA | Lc 84.4 | Fine for body text |
| #42EEFF text on white | 1.40:1 | Fails | Lc 19.3 | Dividers and decoration only |
| #42EEFF text on black | 14.90:1 | AAA | Lc -84.2 | 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
#E4FAFD
oklch(97% 0.023 206.6)
-
Step 100
100
#C3F4FA
oklch(93.5% 0.051 205.5)
-
Step 200
200 (this color)
#42EEFF
oklch(87.2% 0.136 205)
-
Step 300
300
#00D9EB
oklch(80.8% 0.138 205.4)
-
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)
#42EEFF 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) | #DAE4FF | 0.133 |
| Deuteranopia (no green cones) | #C0D1FF | 0.123 |
| Tritanopia (no blue cones) | #00F8F3 | 0.038 |
| Achromatopsia (no color) | #D9D9D9 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42EEFF
#42EEFF
oklch(87.2% 0.136 205)
- #FFC4BE
#FFC4BE
oklch(87.2% 0.069 25.2)
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 #42EEFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.023
- Bright Light Blue #26F7FD ΔE 0.026
- Bright Cyan #41FDFE ΔE 0.042
- Cyan #00FFFF ΔE 0.046
- Bright Turquoise #0FFEF9 ΔE 0.047
- Robin Egg Blue #8AF1FE ΔE 0.048
- Bright Aqua #0BF9EA ΔE 0.050
- Robin's Egg Blue #98EFF9 ΔE 0.058
Use #42EEFF 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.