#42ACFA
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.8% 0.149 244.6), rgb(66, 172, 250).
Aa
Black text reads best on this color (8.51:1).
About this color
#42ACFA is a medium-light, vivid blue. In OKLCH its lightness is 72%, its chroma 0.149 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.050 away. Black text reads best on it, at 8.51:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.51:1 |
| White text | 2.46:1 |
Values
| HEX | #42ACFA |
| RGB | rgb(66, 172, 250) |
| HSL | hsl(205, 95%, 62%) |
| OKLCH | oklch(71.8% 0.149 244.6) |
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 #42ACFA | 2.46:1 | Fails | Lc -53.1 | Large or bold text, headings |
| Black text on #42ACFA | 8.51:1 | AAA | Lc 55.9 | Large or bold text, headings |
| #42ACFA text on white | 2.46:1 | Fails | Lc 48.1 | Large or bold text, headings |
| #42ACFA text on black | 8.51:1 | AAA | Lc -53.9 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCECFB
oklch(93.6% 0.027 246.3)
-
Step 200
200
#BDDEFA
oklch(88.6% 0.052 244)
-
Step 300
300
#8CC7F9
oklch(80.8% 0.094 244.9)
-
Step 400
400 (this color)
#42ACFA
oklch(71.8% 0.149 244.6)
-
Step 500
500
#0090E1
oklch(63.1% 0.158 244.7)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A1
oklch(49.2% 0.123 244.5)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#002945
oklch(27.1% 0.068 244.5)
#42ACFA 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) | #88AEFD | 0.064 |
| Deuteranopia (no green cones) | #6E9DF9 | 0.049 |
| Tritanopia (no blue cones) | #00BFC8 | 0.105 |
| Achromatopsia (no color) | #A5A5A5 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42ACFA
#42ACFA
oklch(71.8% 0.149 244.6)
- #E38D28
#E38D28
oklch(71.8% 0.149 64.3)
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 #42ACFA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.050
- Chefchaouen Blue #4895EF ΔE 0.061
- Cornflower Blue #6495ED ΔE 0.061
- Carolina Blue #8AB8FE ΔE 0.076
- Dark Sky Blue #448EE4 ΔE 0.082
- Dodger Blue #1E90FF ΔE 0.082
- Periwinkle Blue #8F99FB ΔE 0.083
- Bright Sky Blue #02CCFE ΔE 0.085
Use #42ACFA 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.