#42F9E8
Closest named color: Bright Aqua (#0BF9EA). oklch(89% 0.144 185.6), rgb(66, 249, 232).
Aa
Black text reads best on this color (15.94:1).
About this color
#42F9E8 is a light, vivid teal or cyan. In OKLCH its lightness is 89%, its chroma 0.144 and its hue 186°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Aqua (#0BF9EA), ΔE 0.012 away. Black text reads best on it, at 15.94:1.
| Hue family | Teals and cyans |
| Lightness | light (89%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Bright Aqua (#0BF9EA) |
| Black text | 15.94:1 |
| White text | 1.31:1 |
Values
| HEX | #42F9E8 |
| RGB | rgb(66, 249, 232) |
| HSL | hsl(174, 94%, 62%) |
| OKLCH | oklch(89% 0.144 185.6) |
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 #42F9E8 | 1.31:1 | Fails | Lc -17.5 | Dividers and decoration only |
| Black text on #42F9E8 | 15.94:1 | AAA | Lc 88.4 | Fine for body text |
| #42F9E8 text on white | 1.31:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #42F9E8 text on black | 15.94:1 | AAA | Lc -88.6 | 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
#E4FBF8
oklch(97.1% 0.024 187.3)
-
Step 100
100
#C3F6EF
oklch(93.6% 0.053 186)
-
Step 200
200 (this color)
#42F9E8
oklch(89% 0.144 185.6)
-
Step 300
300
#00DECD
oklch(81% 0.143 185.1)
-
Step 400
400
#00B9AB
oklch(70.7% 0.124 185.3)
-
Step 500
500
#009F93
oklch(63.2% 0.111 185.4)
-
Step 600
600
#00857B
oklch(55.5% 0.097 185.6)
-
Step 700
700
#007068
oklch(49.1% 0.086 186.2)
-
Step 800
800
#005C55
oklch(42.7% 0.075 185.9)
-
Step 900
900
#004D46
oklch(37.8% 0.067 184.5)
-
Step 950
950
#002E2A
oklch(27.1% 0.048 185.8)
#42F9E8 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) | #ECEBE8 | 0.152 |
| Deuteranopia (no green cones) | #D3D9EA | 0.143 |
| Tritanopia (no blue cones) | #00FFF3 | 0.019 |
| Achromatopsia (no color) | #E0E0E0 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42F9E8
#42F9E8
oklch(89% 0.144 185.6)
- #FFCBD5
#FFCBD5
oklch(89% 0.06 5.5)
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 #42F9E8, closest first.
No curated palette has a color within ΔE 0.04 of #42F9E8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Aqua #0BF9EA ΔE 0.012
- Bright Turquoise #0FFEF9 ΔE 0.023
- Bright Cyan #41FDFE ΔE 0.030
- Cyan #00FFFF ΔE 0.031
- Bright Light Blue #26F7FD ΔE 0.032
- Light Turquoise #7EF4CC ΔE 0.044
- Aquamarine #7FFFD4 ΔE 0.049
- Bright Teal #01F9C6 ΔE 0.051
Use #42F9E8 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.