#42CBB3
Closest named color: Medium Aquamarine (#66CDAA). oklch(76.3% 0.122 178.7), rgb(66, 203, 179).
Aa
Black text reads best on this color (10.42:1).
About this color
#42CBB3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.122 and its hue 179°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.027 away. Black text reads best on it, at 10.42:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.42:1 |
| White text | 2.01:1 |
Values
| HEX | #42CBB3 |
| RGB | rgb(66, 203, 179) |
| HSL | hsl(169, 57%, 53%) |
| OKLCH | oklch(76.3% 0.122 178.7) |
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 #42CBB3 | 2.01:1 | Fails | Lc -43.2 | Non-text elements, placeholder text |
| Black text on #42CBB3 | 10.42:1 | AAA | Lc 65.2 | Content text, not long reading |
| #42CBB3 text on white | 2.01:1 | Fails | Lc 38.7 | Non-text elements, placeholder text |
| #42CBB3 text on black | 10.42:1 | AAA | Lc -63.6 | 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
#EBF9F5
oklch(97.1% 0.016 177.1)
-
Step 100
100
#D2F2EA
oklch(93.6% 0.035 178.8)
-
Step 200
200
#A9E8DA
oklch(88.5% 0.067 179.4)
-
Step 300
300 (this color)
#42CBB3
oklch(76.3% 0.122 178.7)
-
Step 400
400
#00BAA2
oklch(70.6% 0.129 179.1)
-
Step 500
500
#00A08A
oklch(63.2% 0.116 178.3)
-
Step 600
600
#008674
oklch(55.5% 0.101 178.9)
-
Step 700
700
#007161
oklch(49.1% 0.09 178.4)
-
Step 800
800
#005D50
oklch(42.8% 0.078 178.9)
-
Step 900
900
#004D42
oklch(37.6% 0.069 179)
-
Step 950
950
#002E27
oklch(27% 0.049 179.5)
#42CBB3 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) | #C3BFB2 | 0.129 |
| Deuteranopia (no green cones) | #AFB1B5 | 0.121 |
| Tritanopia (no blue cones) | #00CEC4 | 0.025 |
| Achromatopsia (no color) | #B7B7B7 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42CBB3
#42CBB3
oklch(76.3% 0.122 178.7)
- #F090B1
#F090B1
oklch(76.3% 0.122 358.3)
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 #42CBB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.027
- Medium Turquoise #48D1CC ΔE 0.036
- Dark Turquoise #00CED1 ΔE 0.042
- Seafoam Blue #78D1B6 ΔE 0.045
- Pale Teal #82CBB2 ΔE 0.049
- Emerald #06D6A0 ΔE 0.050
- Topaz #13BBAF ΔE 0.052
- Greenblue #23C48B ΔE 0.059
Use #42CBB3 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.