#42AAEB
Closest named color: Deep Sky Blue (#00BFFF). oklch(70.6% 0.134 240.2), rgb(66, 170, 235).
Aa
Black text reads best on this color (8.18:1).
About this color
#42AAEB is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.134 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.057 away. Black text reads best on it, at 8.18:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.18:1 |
| White text | 2.56:1 |
Values
| HEX | #42AAEB |
| RGB | rgb(66, 170, 235) |
| HSL | hsl(203, 81%, 59%) |
| OKLCH | oklch(70.6% 0.134 240.2) |
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 #42AAEB | 2.56:1 | Fails | Lc -55.0 | Large or bold text, headings |
| Black text on #42AAEB | 8.18:1 | AAA | Lc 54.1 | Large or bold text, headings |
| #42AAEB text on white | 2.56:1 | Fails | Lc 49.9 | Large or bold text, headings |
| #42AAEB text on black | 8.18:1 | AAA | Lc -52.1 | 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
#DCECF9
oklch(93.5% 0.025 242.3)
-
Step 200
200
#BEDEF5
oklch(88.5% 0.046 239.3)
-
Step 300
300
#8FC8F2
oklch(80.9% 0.084 241)
-
Step 400
400 (this color)
#42AAEB
oklch(70.6% 0.134 240.2)
-
Step 500
500
#0092D8
oklch(63% 0.146 240.6)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#42AAEB 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) | #8CABEE | 0.070 |
| Deuteranopia (no green cones) | #759AEA | 0.057 |
| Tritanopia (no blue cones) | #00BAC1 | 0.090 |
| Achromatopsia (no color) | #A2A2A2 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42AAEB
#42AAEB
oklch(70.6% 0.134 240.2)
- #DC8A3F
#DC8A3F
oklch(70.6% 0.134 60)
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 #42AAEB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.057
- Chefchaouen Blue #4895EF ΔE 0.059
- Cornflower Blue #6495ED ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.072
- Dark Sky Blue #448EE4 ΔE 0.076
- Carolina Blue #8AB8FE ΔE 0.084
- Greyblue #77A1B5 ΔE 0.084
- Dodger Blue #1E90FF ΔE 0.086
Use #42AAEB 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.