#42BFC3
Closest named color: Topaz (#13BBAF). oklch(73.9% 0.108 198.2), rgb(66, 191, 195).
Aa
Black text reads best on this color (9.47:1).
About this color
#42BFC3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.108 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.037 away. Black text reads best on it, at 9.47:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.47:1 |
| White text | 2.21:1 |
Values
| HEX | #42BFC3 |
| RGB | rgb(66, 191, 195) |
| HSL | hsl(182, 52%, 51%) |
| OKLCH | oklch(73.9% 0.108 198.2) |
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 #42BFC3 | 2.21:1 | Fails | Lc -48.1 | Large or bold text, headings |
| Black text on #42BFC3 | 9.47:1 | AAA | Lc 60.6 | Content text, not long reading |
| #42BFC3 text on white | 2.21:1 | Fails | Lc 43.3 | Non-text elements, placeholder text |
| #42BFC3 text on black | 9.47:1 | AAA | Lc -58.8 | Large or bold text, headings |
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 400.
-
Step 50
50
#EFF7F8
oklch(97% 0.009 205.9)
-
Step 100
100
#DCEEEE
oklch(93.6% 0.019 196.8)
-
Step 200
200
#BEE1E2
oklch(88.5% 0.037 198.6)
-
Step 300
300
#8CCED0
oklch(80.8% 0.067 198.3)
-
Step 400
400 (this color)
#42BFC3
oklch(73.9% 0.108 198.2)
-
Step 500
500
#009DA1
oklch(63.2% 0.107 198)
-
Step 600
600
#008487
oklch(55.6% 0.095 197.6)
-
Step 700
700
#006F72
oklch(49.2% 0.084 198.1)
-
Step 800
800
#005B5D
oklch(42.7% 0.073 197.4)
-
Step 900
900
#004C4E
oklch(37.8% 0.064 197.8)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#42BFC3 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) | #B2B6C3 | 0.111 |
| Deuteranopia (no green cones) | #9EA8C4 | 0.103 |
| Tritanopia (no blue cones) | #00C5C0 | 0.025 |
| Achromatopsia (no color) | #AEAEAE | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42BFC3
#42BFC3
oklch(73.9% 0.108 198.2)
- #E68E90
#E68E90
oklch(73.8% 0.107 18.5)
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 #42BFC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.037
- Dark Turquoise #00CED1 ΔE 0.041
- Turquoise Blue #06B1C4 ΔE 0.049
- Medium Turquoise #48D1CC ΔE 0.050
- Light Sea Green #20B2AA ΔE 0.051
- Greeny Blue #42B395 ΔE 0.066
- Vivid Sky Blue #4CC9F0 ΔE 0.066
- Medium Aquamarine #66CDAA ΔE 0.067
Use #42BFC3 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.