#42B2CB
Closest named color: Turquoise Blue (#06B1C4). oklch(71.1% 0.105 215.5), rgb(66, 178, 203).
Aa
Black text reads best on this color (8.46:1).
About this color
#42B2CB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.105 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.024 away. Black text reads best on it, at 8.46:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.46:1 |
| White text | 2.48:1 |
Values
| HEX | #42B2CB |
| RGB | rgb(66, 178, 203) |
| HSL | hsl(191, 57%, 53%) |
| OKLCH | oklch(71.1% 0.105 215.5) |
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 #42B2CB | 2.48:1 | Fails | Lc -53.5 | Large or bold text, headings |
| Black text on #42B2CB | 8.46:1 | AAA | Lc 55.6 | Large or bold text, headings |
| #42B2CB text on white | 2.48:1 | Fails | Lc 48.4 | Large or bold text, headings |
| #42B2CB text on black | 8.46:1 | AAA | Lc -53.5 | 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
#EFF7F9
oklch(97.1% 0.009 214.3)
-
Step 100
100
#DCEDF2
oklch(93.5% 0.019 217.2)
-
Step 200
200
#BFE0E8
oklch(88.5% 0.036 214)
-
Step 300
300
#8FCCDC
oklch(80.9% 0.066 215.9)
-
Step 400
400 (this color)
#42B2CB
oklch(71.1% 0.105 215.5)
-
Step 500
500
#009AB4
oklch(63.2% 0.112 215.3)
-
Step 600
600
#008198
oklch(55.6% 0.099 216.1)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#004A58
oklch(37.7% 0.067 215.8)
-
Step 950
950
#002C35
oklch(27% 0.048 215.4)
#42B2CB 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) | #A1ADCC | 0.094 |
| Deuteranopia (no green cones) | #8D9ECB | 0.085 |
| Tritanopia (no blue cones) | #00BBBA | 0.046 |
| Achromatopsia (no color) | #A4A4A4 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42B2CB
#42B2CB
oklch(71.1% 0.105 215.5)
- #DB8974
#DB8974
oklch(71% 0.106 35.1)
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 #42B2CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.024
- Light Sea Green #20B2AA ΔE 0.055
- Topaz #13BBAF ΔE 0.059
- Greyblue #77A1B5 ΔE 0.060
- Bluegrey #85A3B2 ΔE 0.069
- Cadet Blue #5F9EA0 ΔE 0.071
- Deep Sky Blue #00BFFF ΔE 0.075
- Vivid Sky Blue #4CC9F0 ΔE 0.075
Use #42B2CB 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.