#42E1DD
Closest named color: Turquoise (#40E0D0). oklch(82.9% 0.128 192.5), rgb(66, 225, 221).
Aa
Black text reads best on this color (13.04:1).
About this color
#42E1DD is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.128 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.018 away. Black text reads best on it, at 13.04:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 13.04:1 |
| White text | 1.60:1 |
Values
| HEX | #42E1DD |
| RGB | rgb(66, 225, 221) |
| HSL | hsl(178, 73%, 57%) |
| OKLCH | oklch(82.9% 0.128 192.5) |
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 #42E1DD | 1.60:1 | Fails | Lc -30.5 | Non-text elements, placeholder text |
| Black text on #42E1DD | 13.04:1 | AAA | Lc 76.8 | Fine for body text |
| #42E1DD text on white | 1.60:1 | Fails | Lc 27.0 | Dividers and decoration only |
| #42E1DD text on black | 13.04:1 | AAA | Lc -76.0 | 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
#E9F9F8
oklch(97% 0.017 192.4)
-
Step 100
100
#CFF2F0
oklch(93.6% 0.036 192.3)
-
Step 200
200
#A1E9E5
oklch(88.6% 0.072 191.6)
-
Step 300
300 (this color)
#42E1DD
oklch(82.9% 0.128 192.5)
-
Step 400
400
#00B8B5
oklch(70.8% 0.121 192.7)
-
Step 500
500
#009E9B
oklch(63.2% 0.108 192.4)
-
Step 600
600
#008582
oklch(55.7% 0.096 192)
-
Step 700
700
#006F6D
oklch(49% 0.084 192.6)
-
Step 800
800
#005B5A
oklch(42.6% 0.073 193.5)
-
Step 900
900
#004C4B
oklch(37.7% 0.064 193.2)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#42E1DD 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) | #D3D6DD | 0.134 |
| Deuteranopia (no green cones) | #BCC5DE | 0.125 |
| Tritanopia (no blue cones) | #00E8DF | 0.021 |
| Achromatopsia (no color) | #CCCCCC | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42E1DD
#42E1DD
oklch(82.9% 0.128 192.5)
- #FFADB6
#FFADB6
oklch(82.9% 0.097 12.2)
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 #42E1DD, closest first.
No curated palette has a color within ΔE 0.04 of #42E1DD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.018
- Aqua Blue #02D8E9 ΔE 0.039
- Medium Turquoise #48D1CC ΔE 0.044
- Dark Turquoise #00CED1 ΔE 0.058
- Aqua Marine #2EE8BB ΔE 0.059
- Robin's Egg #6DEDFD ΔE 0.060
- Seafoam Blue #78D1B6 ΔE 0.060
- Bright Aqua #0BF9EA ΔE 0.063
Use #42E1DD 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.