#42FBF4
Closest named color: Bright Turquoise (#0FFEF9). oklch(89.8% 0.142 191.1), rgb(66, 251, 244).
Aa
Black text reads best on this color (16.33:1).
About this color
#42FBF4 is a light, vivid teal or cyan. In OKLCH its lightness is 90%, its chroma 0.142 and its hue 191°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Turquoise (#0FFEF9), ΔE 0.012 away. Black text reads best on it, at 16.33:1.
| Hue family | Teals and cyans |
| Lightness | light (90%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Bright Turquoise (#0FFEF9) |
| Black text | 16.33:1 |
| White text | 1.28:1 |
Values
| HEX | #42FBF4 |
| RGB | rgb(66, 251, 244) |
| HSL | hsl(178, 96%, 62%) |
| OKLCH | oklch(89.8% 0.142 191.1) |
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 #42FBF4 | 1.28:1 | Fails | Lc -15.8 | Dividers and decoration only |
| Black text on #42FBF4 | 16.33:1 | AAA | Lc 89.9 | Fine for body text |
| #42FBF4 text on white | 1.28:1 | Fails | Lc 13.7 | Not readable |
| #42FBF4 text on black | 16.33:1 | AAA | Lc -90.2 | Preferred 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
#E4FBF9
oklch(97.1% 0.024 190.4)
-
Step 100
100
#C2F6F2
oklch(93.6% 0.053 190.5)
-
Step 200
200 (this color)
#42FBF4
oklch(89.8% 0.142 191.1)
-
Step 300
300
#00DCD6
oklch(80.8% 0.139 191.3)
-
Step 400
400
#00B8B3
oklch(70.7% 0.122 191.3)
-
Step 500
500
#009E99
oklch(63.1% 0.109 190.8)
-
Step 600
600
#008581
oklch(55.7% 0.096 191.1)
-
Step 700
700
#00706C
oklch(49.2% 0.085 190.4)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#42FBF4 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) | #ECEEF4 | 0.150 |
| Deuteranopia (no green cones) | #D2DBF5 | 0.140 |
| Tritanopia (no blue cones) | #00FFF8 | 0.014 |
| Achromatopsia (no color) | #E3E3E3 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42FBF4
#42FBF4
oklch(89.8% 0.142 191.1)
- #FFCFD4
#FFCFD4
oklch(89.7% 0.055 11.2)
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 #42FBF4, closest first.
No curated palette has a color within ΔE 0.04 of #42FBF4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Turquoise #0FFEF9 ΔE 0.012
- Bright Cyan #41FDFE ΔE 0.013
- Cyan #00FFFF ΔE 0.017
- Bright Aqua #0BF9EA ΔE 0.020
- Bright Light Blue #26F7FD ΔE 0.021
- Robin's Egg #6DEDFD ΔE 0.048
- Robin Egg Blue #8AF1FE ΔE 0.054
- Light Turquoise #7EF4CC ΔE 0.055
Use #42FBF4 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.