#42CDAC
Closest named color: Medium Aquamarine (#66CDAA). oklch(76.6% 0.128 173.6), rgb(66, 205, 172).
Aa
Black text reads best on this color (10.55:1).
About this color
#42CDAC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.128 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.023 away. Black text reads best on it, at 10.55:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.55:1 |
| White text | 1.98:1 |
Values
| HEX | #42CDAC |
| RGB | rgb(66, 205, 172) |
| HSL | hsl(166, 58%, 53%) |
| OKLCH | oklch(76.6% 0.128 173.6) |
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 #42CDAC | 1.98:1 | Fails | Lc -42.5 | Non-text elements, placeholder text |
| Black text on #42CDAC | 10.55:1 | AAA | Lc 65.8 | Content text, not long reading |
| #42CDAC text on white | 1.98:1 | Fails | Lc 38.1 | Non-text elements, placeholder text |
| #42CDAC text on black | 10.55:1 | AAA | Lc -64.3 | 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
#EBF9F4
oklch(97% 0.016 172.7)
-
Step 100
100
#D2F2E8
oklch(93.5% 0.036 174.7)
-
Step 200
200
#A8E9D5
oklch(88.5% 0.071 173.6)
-
Step 300
300 (this color)
#42CDAC
oklch(76.6% 0.128 173.6)
-
Step 400
400
#00BB99
oklch(70.6% 0.135 173.4)
-
Step 500
500
#00A183
oklch(63.2% 0.121 173.2)
-
Step 600
600
#00876E
oklch(55.6% 0.106 173.6)
-
Step 700
700
#00725C
oklch(49.2% 0.094 173.1)
-
Step 800
800
#005D4B
oklch(42.7% 0.081 173.5)
-
Step 900
900
#004E3E
oklch(37.8% 0.073 172.9)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#42CDAC 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) | #C6C0AA | 0.132 |
| Deuteranopia (no green cones) | #B3B2AE | 0.127 |
| Tritanopia (no blue cones) | #00CFC3 | 0.032 |
| Achromatopsia (no color) | #B8B8B8 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42CDAC
#42CDAC
oklch(76.6% 0.128 173.6)
- #F18FB9
#F18FB9
oklch(76.5% 0.128 353.4)
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 #42CDAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.023
- Emerald #06D6A0 ΔE 0.038
- Medium Turquoise #48D1CC ΔE 0.045
- Seafoam Blue #78D1B6 ΔE 0.045
- Pale Teal #82CBB2 ΔE 0.051
- Greenblue #23C48B ΔE 0.051
- Dark Turquoise #00CED1 ΔE 0.052
- Green Blue #01C08D ΔE 0.057
Use #42CDAC 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.