#42E1E9
Closest named color: Aqua Blue (#02D8E9). oklch(83.3% 0.127 200), rgb(66, 225, 233).
Aa
Black text reads best on this color (13.17:1).
About this color
#42E1E9 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.127 and its hue 200°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.032 away. Black text reads best on it, at 13.17:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 13.17:1 |
| White text | 1.59:1 |
Values
| HEX | #42E1E9 |
| RGB | rgb(66, 225, 233) |
| HSL | hsl(183, 79%, 59%) |
| OKLCH | oklch(83.3% 0.127 200) |
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 #42E1E9 | 1.59:1 | Fails | Lc -29.9 | Dividers and decoration only |
| Black text on #42E1E9 | 13.17:1 | AAA | Lc 77.4 | Fine for body text |
| #42E1E9 text on white | 1.59:1 | Fails | Lc 26.4 | Dividers and decoration only |
| #42E1E9 text on black | 13.17:1 | AAA | Lc -76.6 | 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 300.
-
Step 50
50
#E9F9FA
oklch(97.1% 0.017 201.4)
-
Step 100
100
#CEF2F4
oklch(93.6% 0.037 200.7)
-
Step 200
200
#A1E8EC
oklch(88.6% 0.071 200.4)
-
Step 300
300 (this color)
#42E1E9
oklch(83.3% 0.127 200)
-
Step 400
400
#00B6BE
oklch(70.6% 0.12 200.4)
-
Step 500
500
#009CA3
oklch(63% 0.107 200.4)
-
Step 600
600
#008489
oklch(55.7% 0.095 199.5)
-
Step 700
700
#006F73
oklch(49.2% 0.084 199.2)
-
Step 800
800
#005B5F
oklch(42.8% 0.073 200)
-
Step 900
900
#004C4F
oklch(37.8% 0.064 199.4)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#42E1E9 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) | #D0D7EA | 0.129 |
| Deuteranopia (no green cones) | #B9C5EA | 0.121 |
| Tritanopia (no blue cones) | #00E9E3 | 0.029 |
| Achromatopsia (no color) | #CDCDCD | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E1E9
#42E1E9
oklch(83.3% 0.127 200)
- #FFB1B0
#FFB1B0
oklch(83.4% 0.092 20)
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 #42E1E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.032
- Turquoise #40E0D0 ΔE 0.036
- Robin's Egg #6DEDFD ΔE 0.050
- Medium Turquoise #48D1CC ΔE 0.051
- Bright Light Blue #26F7FD ΔE 0.058
- Dark Turquoise #00CED1 ΔE 0.062
- Bright Aqua #0BF9EA ΔE 0.066
- Sky Blue #87CEEB ΔE 0.067
Use #42E1E9 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.