#42AEEA
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.5% 0.13 237.2), rgb(66, 174, 234).
Aa
Black text reads best on this color (8.47:1).
About this color
#42AEEA is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.130 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.049 away. Black text reads best on it, at 8.47:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.47:1 |
| White text | 2.47:1 |
Values
| HEX | #42AEEA |
| RGB | rgb(66, 174, 234) |
| HSL | hsl(201, 80%, 59%) |
| OKLCH | oklch(71.5% 0.13 237.2) |
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 #42AEEA | 2.47:1 | Fails | Lc -53.4 | Large or bold text, headings |
| Black text on #42AEEA | 8.47:1 | AAA | Lc 55.6 | Large or bold text, headings |
| #42AEEA text on white | 2.47:1 | Fails | Lc 48.4 | Large or bold text, headings |
| #42AEEA text on black | 8.47:1 | AAA | Lc -53.6 | 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
#EFF7FC
oklch(97.2% 0.011 234.8)
-
Step 100
100
#DCEDF8
oklch(93.7% 0.023 236)
-
Step 200
200
#BEDEF4
oklch(88.4% 0.046 238.1)
-
Step 300
300
#8EC9EF
oklch(80.9% 0.081 237.3)
-
Step 400
400 (this color)
#42AEEA
oklch(71.5% 0.13 237.2)
-
Step 500
500
#0094D2
oklch(63.2% 0.138 237.1)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#42AEEA 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) | #91AEED | 0.074 |
| Deuteranopia (no green cones) | #7B9DE9 | 0.062 |
| Tritanopia (no blue cones) | #00BDC3 | 0.084 |
| Achromatopsia (no color) | #A4A4A4 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42AEEA
#42AEEA
oklch(71.5% 0.13 237.2)
- #E08C4A
#E08C4A
oklch(71.5% 0.131 56.7)
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 #42AEEA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.049
- Turquoise Blue #06B1C4 ΔE 0.066
- Chefchaouen Blue #4895EF ΔE 0.070
- Cornflower Blue #6495ED ΔE 0.070
- Vivid Sky Blue #4CC9F0 ΔE 0.075
- Carolina Blue #8AB8FE ΔE 0.079
- Bright Sky Blue #02CCFE ΔE 0.079
- Greyblue #77A1B5 ΔE 0.083
Use #42AEEA 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.