#42A0D1
Closest named color: Turquoise Blue (#06B1C4). oklch(67.1% 0.114 234.9), rgb(66, 160, 209).
Aa
Black text reads best on this color (7.18:1).
About this color
#42A0D1 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.114 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.059 away. Black text reads best on it, at 7.18:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.18:1 |
| White text | 2.92:1 |
Values
| HEX | #42A0D1 |
| RGB | rgb(66, 160, 209) |
| HSL | hsl(201, 61%, 54%) |
| OKLCH | oklch(67.1% 0.114 234.9) |
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 #42A0D1 | 2.92:1 | Fails | Lc -60.7 | Content text, not long reading |
| Black text on #42A0D1 | 7.18:1 | AAA | Lc 48.7 | Large or bold text, headings |
| #42A0D1 text on white | 2.92:1 | Fails | Lc 55.4 | Large or bold text, headings |
| #42A0D1 text on black | 7.18:1 | AAA | Lc -46.4 | 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
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DDECF6
oklch(93.5% 0.021 236.8)
-
Step 200
200
#C1DEF0
oklch(88.5% 0.04 235.2)
-
Step 300
300
#94C9E8
oklch(81% 0.07 234.5)
-
Step 400
400 (this color)
#42A0D1
oklch(67.1% 0.114 234.9)
-
Step 500
500
#0095CE
oklch(63.2% 0.133 234.7)
-
Step 600
600
#007DAE
oklch(55.7% 0.118 234.9)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#42A0D1 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) | #889FD3 | 0.070 |
| Deuteranopia (no green cones) | #7591D0 | 0.059 |
| Tritanopia (no blue cones) | #00ADB1 | 0.073 |
| Achromatopsia (no color) | #979797 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42A0D1
#42A0D1
oklch(67.1% 0.114 234.9)
- #CB814D
#CB814D
oklch(67% 0.114 54.5)
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 #42A0D1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.059
- Faded Blue #658CBB ΔE 0.060
- Chefchaouen Blue #4895EF ΔE 0.060
- Greyblue #77A1B5 ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.063
- Cornflower Blue #6495ED ΔE 0.064
- Cadet Blue #5F9EA0 ΔE 0.074
- Silver Lake Blue #778DA9 ΔE 0.077
Use #42A0D1 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.