#42A0CA
Closest named color: Turquoise Blue (#06B1C4). oklch(66.7% 0.107 230.8), rgb(66, 160, 202).
Aa
Black text reads best on this color (7.11:1).
About this color
#42A0CA is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.107 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.054 away. Black text reads best on it, at 7.11:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.11:1 |
| White text | 2.95:1 |
Values
| HEX | #42A0CA |
| RGB | rgb(66, 160, 202) |
| HSL | hsl(199, 56%, 53%) |
| OKLCH | oklch(66.7% 0.107 230.8) |
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 #42A0CA | 2.95:1 | Fails | Lc -61.1 | Content text, not long reading |
| Black text on #42A0CA | 7.11:1 | AAA | Lc 48.3 | Large or bold text, headings |
| #42A0CA text on white | 2.95:1 | Fails | Lc 55.8 | Large or bold text, headings |
| #42A0CA text on black | 7.11:1 | AAA | Lc -46.0 | 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 500.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C7DDE9
oklch(88.5% 0.029 231.5)
-
Step 300
300
#9FC7DD
oklch(80.8% 0.053 232.3)
-
Step 400
400
#67AACB
oklch(70.6% 0.084 231)
-
Step 500
500 (this color)
#42A0CA
oklch(66.7% 0.107 230.8)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#0C4860
oklch(37.8% 0.07 230.8)
-
Step 950
950
#0B2A38
oklch(27% 0.044 231.3)
#42A0CA 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) | #8B9ECC | 0.074 |
| Deuteranopia (no green cones) | #7890C9 | 0.063 |
| Tritanopia (no blue cones) | #00ACAE | 0.067 |
| Achromatopsia (no color) | #969696 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42A0CA
#42A0CA
oklch(66.7% 0.107 230.8)
- #C98055
#C98055
oklch(66.7% 0.108 50.6)
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 #42A0CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.054
- Greyblue #77A1B5 ΔE 0.056
- Faded Blue #658CBB ΔE 0.058
- Cadet Blue #5F9EA0 ΔE 0.064
- Chefchaouen Blue #4895EF ΔE 0.070
- Dark Sky Blue #448EE4 ΔE 0.071
- Silver Lake Blue #778DA9 ΔE 0.072
- Cornflower Blue #6495ED ΔE 0.074
Use #42A0CA 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.