#42CFB3
Closest named color: Medium Aquamarine (#66CDAA). oklch(77.3% 0.126 176.7), rgb(66, 207, 179).
Aa
Black text reads best on this color (10.80:1).
About this color
#42CFB3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.126 and its hue 177°. 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 10.80:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.80:1 |
| White text | 1.94:1 |
Values
| HEX | #42CFB3 |
| RGB | rgb(66, 207, 179) |
| HSL | hsl(168, 59%, 54%) |
| OKLCH | oklch(77.3% 0.126 176.7) |
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 #42CFB3 | 1.94:1 | Fails | Lc -41.3 | Non-text elements, placeholder text |
| Black text on #42CFB3 | 10.80:1 | AAA | Lc 67.0 | Content text, not long reading |
| #42CFB3 text on white | 1.94:1 | Fails | Lc 36.9 | Non-text elements, placeholder text |
| #42CFB3 text on black | 10.80:1 | AAA | Lc -65.5 | 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
#D2F2E9
oklch(93.6% 0.035 176.7)
-
Step 200
200
#A8E9D8
oklch(88.6% 0.07 176.6)
-
Step 300
300 (this color)
#42CFB3
oklch(77.3% 0.126 176.7)
-
Step 400
400
#00BB9E
oklch(70.8% 0.132 176.2)
-
Step 500
500
#00A088
oklch(63.1% 0.117 177)
-
Step 600
600
#008772
oklch(55.7% 0.104 176.6)
-
Step 700
700
#00715F
oklch(49% 0.091 176.5)
-
Step 800
800
#005D4E
oklch(42.8% 0.079 176.7)
-
Step 900
900
#004D41
oklch(37.6% 0.069 177.7)
-
Step 950
950
#002E26
oklch(26.9% 0.05 177.5)
#42CFB3 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) | #C7C2B2 | 0.132 |
| Deuteranopia (no green cones) | #B4B4B5 | 0.126 |
| Tritanopia (no blue cones) | #00D2C7 | 0.028 |
| Achromatopsia (no color) | #BABABA | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42CFB3
#42CFB3
oklch(77.3% 0.126 176.7)
- #F592B7
#F592B7
oklch(77.3% 0.126 356.6)
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 #42CFB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.023
- Medium Turquoise #48D1CC ΔE 0.036
- Seafoam Blue #78D1B6 ΔE 0.040
- Emerald #06D6A0 ΔE 0.042
- Dark Turquoise #00CED1 ΔE 0.045
- Pale Teal #82CBB2 ΔE 0.047
- Turquoise #40E0D0 ΔE 0.053
- Greenblue #23C48B ΔE 0.061
Use #42CFB3 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.