#42CFC5
Closest named color: Medium Turquoise (#48D1CC). oklch(77.8% 0.119 188.1), rgb(66, 207, 197).
Aa
Black text reads best on this color (10.96:1).
About this color
#42CFC5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.119 and its hue 188°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Turquoise (#48D1CC), ΔE 0.011 away. Black text reads best on it, at 10.96:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (78%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Medium Turquoise (#48D1CC) |
| Black text | 10.96:1 |
| White text | 1.91:1 |
Values
| HEX | #42CFC5 |
| RGB | rgb(66, 207, 197) |
| HSL | hsl(176, 59%, 54%) |
| OKLCH | oklch(77.8% 0.119 188.1) |
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 #42CFC5 | 1.91:1 | Fails | Lc -40.5 | Non-text elements, placeholder text |
| Black text on #42CFC5 | 10.96:1 | AAA | Lc 67.7 | Content text, not long reading |
| #42CFC5 text on white | 1.91:1 | Fails | Lc 36.2 | Non-text elements, placeholder text |
| #42CFC5 text on black | 10.96:1 | AAA | Lc -66.3 | 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
#EAF9F7
oklch(97% 0.016 187.3)
-
Step 100
100
#D1F2EE
oklch(93.6% 0.035 187.7)
-
Step 200
200
#A7E8E1
oklch(88.5% 0.066 187.7)
-
Step 300
300 (this color)
#42CFC5
oklch(77.8% 0.119 188.1)
-
Step 400
400
#00B9AF
oklch(70.8% 0.123 188)
-
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)
#42CFC5 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) | #C4C4C5 | 0.126 |
| Deuteranopia (no green cones) | #AFB5C6 | 0.118 |
| Tritanopia (no blue cones) | #00D4CC | 0.019 |
| Achromatopsia (no color) | #BBBBBB | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42CFC5
#42CFC5
oklch(77.8% 0.119 188.1)
- #F896A8
#F896A8
oklch(77.9% 0.119 8.3)
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 #42CFC5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Turquoise #48D1CC ΔE 0.011
- Dark Turquoise #00CED1 ΔE 0.023
- Medium Aquamarine #66CDAA ΔE 0.039
- Seafoam Blue #78D1B6 ΔE 0.042
- Turquoise #40E0D0 ΔE 0.046
- Pale Teal #82CBB2 ΔE 0.049
- Aqua Blue #02D8E9 ΔE 0.049
- Topaz #13BBAF ΔE 0.064
Use #42CFC5 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.