#42DDD3
Closest named color: Turquoise (#40E0D0). oklch(81.6% 0.127 188.6), rgb(66, 221, 211).
Aa
Black text reads best on this color (12.51:1).
About this color
#42DDD3 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.127 and its hue 189°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.011 away. Black text reads best on it, at 12.51:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 12.51:1 |
| White text | 1.67:1 |
Values
| HEX | #42DDD3 |
| RGB | rgb(66, 221, 211) |
| HSL | hsl(176, 70%, 56%) |
| OKLCH | oklch(81.6% 0.127 188.6) |
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 #42DDD3 | 1.67:1 | Fails | Lc -33.0 | Non-text elements, placeholder text |
| Black text on #42DDD3 | 12.51:1 | AAA | Lc 74.5 | Content text, not long reading |
| #42DDD3 text on white | 1.67:1 | Fails | Lc 29.3 | Dividers and decoration only |
| #42DDD3 text on black | 12.51:1 | AAA | Lc -73.6 | Content text, not long reading |
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
#CFF2EF
oklch(93.5% 0.037 190.2)
-
Step 200
200
#A3E9E2
oklch(88.6% 0.07 188.2)
-
Step 300
300 (this color)
#42DDD3
oklch(81.6% 0.127 188.6)
-
Step 400
400
#00B9B0
oklch(70.8% 0.123 188.6)
-
Step 500
500
#009E96
oklch(63% 0.109 188.5)
-
Step 600
600
#00857E
oklch(55.6% 0.097 188.3)
-
Step 700
700
#00706A
oklch(49.1% 0.085 188.3)
-
Step 800
800
#005C57
oklch(42.8% 0.074 188.4)
-
Step 900
900
#004C48
oklch(37.6% 0.065 188.7)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#42DDD3 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) | #D1D1D3 | 0.135 |
| Deuteranopia (no green cones) | #BAC1D4 | 0.125 |
| Tritanopia (no blue cones) | #00E3DA | 0.019 |
| Achromatopsia (no color) | #C8C8C8 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42DDD3
#42DDD3
oklch(81.6% 0.127 188.6)
- #FFA6B5
#FFA6B5
oklch(81.7% 0.106 8.7)
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 #42DDD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.011
- Medium Turquoise #48D1CC ΔE 0.032
- Aqua Blue #02D8E9 ΔE 0.041
- Dark Turquoise #00CED1 ΔE 0.048
- Seafoam Blue #78D1B6 ΔE 0.049
- Aqua Marine #2EE8BB ΔE 0.053
- Medium Aquamarine #66CDAA ΔE 0.059
- Pale Teal #82CBB2 ΔE 0.063
Use #42DDD3 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.