#42CFAF
Closest named color: Medium Aquamarine (#66CDAA). oklch(77.2% 0.128 174.3), rgb(66, 207, 175).
Aa
Black text reads best on this color (10.77:1).
About this color
#42CFAF 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 0.022 away. Black text reads best on it, at 10.77:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.77:1 |
| White text | 1.94:1 |
Values
| HEX | #42CFAF |
| RGB | rgb(66, 207, 175) |
| HSL | hsl(166, 59%, 54%) |
| OKLCH | oklch(77.2% 0.128 174.3) |
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 #42CFAF | 1.94:1 | Fails | Lc -41.4 | Non-text elements, placeholder text |
| Black text on #42CFAF | 10.77:1 | AAA | Lc 66.8 | Content text, not long reading |
| #42CFAF text on white | 1.94:1 | Fails | Lc 37.1 | Non-text elements, placeholder text |
| #42CFAF text on black | 10.77:1 | AAA | Lc -65.4 | 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
#EAF9F5
oklch(97% 0.017 178.3)
-
Step 100
100
#D2F2E8
oklch(93.5% 0.036 174.7)
-
Step 200
200
#A8E9D6
oklch(88.5% 0.071 174.6)
-
Step 300
300 (this color)
#42CFAF
oklch(77.2% 0.128 174.3)
-
Step 400
400
#00BB9B
oklch(70.7% 0.134 174.5)
-
Step 500
500
#00A084
oklch(63% 0.119 174.3)
-
Step 600
600
#00876F
oklch(55.6% 0.106 174.3)
-
Step 700
700
#00715D
oklch(49% 0.093 174.7)
-
Step 800
800
#005D4C
oklch(42.7% 0.081 174.6)
-
Step 900
900
#004E3F
oklch(37.8% 0.072 174.1)
-
Step 950
950
#002E25
oklch(26.9% 0.05 175.6)
#42CFAF 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) | #C8C2AE | 0.134 |
| Deuteranopia (no green cones) | #B5B4B1 | 0.128 |
| Tritanopia (no blue cones) | #00D1C6 | 0.032 |
| Achromatopsia (no color) | #BABABA | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42CFAF
#42CFAF
oklch(77.2% 0.128 174.3)
- #F491BA
#F491BA
oklch(77.2% 0.128 354.2)
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 #42CFAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.022
- Emerald #06D6A0 ΔE 0.037
- Medium Turquoise #48D1CC ΔE 0.041
- Seafoam Blue #78D1B6 ΔE 0.042
- Pale Teal #82CBB2 ΔE 0.049
- Dark Turquoise #00CED1 ΔE 0.050
- Greenblue #23C48B ΔE 0.056
- Turquoise #40E0D0 ΔE 0.056
Use #42CFAF 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.