#42AADA
Closest named color: Turquoise Blue (#06B1C4). oklch(69.8% 0.117 232.1), rgb(66, 170, 218).
Aa
Black text reads best on this color (7.99:1).
About this color
#42AADA is a medium-light, moderately saturated blue. In OKLCH its lightness is 70%, its chroma 0.117 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.049 away. Black text reads best on it, at 7.99:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.99:1 |
| White text | 2.62:1 |
Values
| HEX | #42AADA |
| RGB | rgb(66, 170, 218) |
| HSL | hsl(199, 67%, 56%) |
| OKLCH | oklch(69.8% 0.117 232.1) |
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 #42AADA | 2.62:1 | Fails | Lc -56.1 | Large or bold text, headings |
| Black text on #42AADA | 7.99:1 | AAA | Lc 53.1 | Large or bold text, headings |
| #42AADA text on white | 2.62:1 | Fails | Lc 50.9 | Large or bold text, headings |
| #42AADA text on black | 7.99:1 | AAA | Lc -51.0 | 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 400.
-
Step 50
50
#EFF7FB
oklch(97.1% 0.01 228.9)
-
Step 100
100
#DDEDF6
oklch(93.7% 0.021 232.1)
-
Step 200
200
#BFDFF0
oklch(88.6% 0.041 231)
-
Step 300
300
#90CAE8
oklch(81% 0.073 231.3)
-
Step 400
400 (this color)
#42AADA
oklch(69.8% 0.117 232.1)
-
Step 500
500
#0096C9
oklch(63.2% 0.128 231.5)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#004863
oklch(37.7% 0.077 231.8)
-
Step 950
950
#002B3D
oklch(27.1% 0.055 231.9)
#42AADA 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) | #92A8DC | 0.077 |
| Deuteranopia (no green cones) | #7D99D9 | 0.066 |
| Tritanopia (no blue cones) | #00B7BA | 0.072 |
| Achromatopsia (no color) | #A0A0A0 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42AADA
#42AADA
oklch(69.8% 0.117 232.1)
- #D78856
#D78856
oklch(69.9% 0.117 52.1)
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 #42AADA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.049
- Greyblue #77A1B5 ΔE 0.064
- Deep Sky Blue #00BFFF ΔE 0.068
- Chefchaouen Blue #4895EF ΔE 0.072
- Cornflower Blue #6495ED ΔE 0.073
- Bluegrey #85A3B2 ΔE 0.078
- Bluey Grey #89A0B0 ΔE 0.083
- Dark Sky Blue #448EE4 ΔE 0.083
Use #42AADA 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.