#42ABFB
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.7% 0.151 245.4), rgb(66, 171, 251).
Aa
Black text reads best on this color (8.44:1).
About this color
#42ABFB is a medium-light, vivid blue. In OKLCH its lightness is 72%, its chroma 0.151 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.053 away. Black text reads best on it, at 8.44:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.44:1 |
| White text | 2.48:1 |
Values
| HEX | #42ABFB |
| RGB | rgb(66, 171, 251) |
| HSL | hsl(206, 96%, 62%) |
| OKLCH | oklch(71.7% 0.151 245.4) |
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 #42ABFB | 2.48:1 | Fails | Lc -53.5 | Large or bold text, headings |
| Black text on #42ABFB | 8.44:1 | AAA | Lc 55.6 | Large or bold text, headings |
| #42ABFB text on white | 2.48:1 | Fails | Lc 48.4 | Large or bold text, headings |
| #42ABFB text on black | 8.44:1 | AAA | Lc -53.5 | 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
#EFF7FE
oklch(97.2% 0.013 244.3)
-
Step 100
100
#DCECFB
oklch(93.6% 0.027 246.3)
-
Step 200
200
#BDDDFA
oklch(88.4% 0.053 245.8)
-
Step 300
300
#8DC7FA
oklch(80.9% 0.094 245.8)
-
Step 400
400 (this color)
#42ABFB
oklch(71.7% 0.151 245.4)
-
Step 500
500
#0090E3
oklch(63.2% 0.16 245.3)
-
Step 600
600
#0079C0
oklch(55.7% 0.141 245.3)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#002945
oklch(27.1% 0.068 244.5)
#42ABFB 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) | #86AEFE | 0.063 |
| Deuteranopia (no green cones) | #6C9DF9 | 0.046 |
| Tritanopia (no blue cones) | #00BEC8 | 0.106 |
| Achromatopsia (no color) | #A4A4A4 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42ABFB
#42ABFB
oklch(71.7% 0.151 245.4)
- #E28D22
#E28D22
oklch(71.6% 0.15 65.5)
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 #42ABFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.053
- Chefchaouen Blue #4895EF ΔE 0.058
- Cornflower Blue #6495ED ΔE 0.059
- Carolina Blue #8AB8FE ΔE 0.078
- Dodger Blue #1E90FF ΔE 0.079
- Dark Sky Blue #448EE4 ΔE 0.079
- Periwinkle Blue #8F99FB ΔE 0.082
- Bright Sky Blue #02CCFE ΔE 0.088
Use #42ABFB 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.