#42A6FF
Closest named color: Chefchaouen Blue (#4895EF). oklch(70.8% 0.16 249), rgb(66, 166, 255).
Aa
Black text reads best on this color (8.13:1).
About this color
#42A6FF is a medium-light, vivid blue. In OKLCH its lightness is 71%, its chroma 0.160 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.047 away. Black text reads best on it, at 8.13:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 8.13:1 |
| White text | 2.58:1 |
Values
| HEX | #42A6FF |
| RGB | rgb(66, 166, 255) |
| HSL | hsl(208, 100%, 63%) |
| OKLCH | oklch(70.8% 0.16 249) |
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 #42A6FF | 2.58:1 | Fails | Lc -55.2 | Large or bold text, headings |
| Black text on #42A6FF | 8.13:1 | AAA | Lc 53.9 | Large or bold text, headings |
| #42A6FF text on white | 2.58:1 | Fails | Lc 50.1 | Large or bold text, headings |
| #42A6FF text on black | 8.13:1 | AAA | Lc -51.8 | 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
#EFF6FE
oklch(97% 0.013 251.6)
-
Step 100
100
#DCECFD
oklch(93.6% 0.029 249.8)
-
Step 200
200
#BEDDFD
oklch(88.5% 0.055 249.3)
-
Step 300
300
#8DC6FF
oklch(80.9% 0.1 249.2)
-
Step 400
400 (this color)
#42A6FF
oklch(70.8% 0.16 249)
-
Step 500
500
#008DED
oklch(63.1% 0.175 249.1)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#004376
oklch(37.6% 0.105 249.5)
-
Step 950
950
#002849
oklch(27.1% 0.074 248.8)
#42A6FF 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) | #7DABFF | 0.055 |
| Deuteranopia (no green cones) | #6199FD | 0.038 |
| Tritanopia (no blue cones) | #00BBC6 | 0.118 |
| Achromatopsia (no color) | #A1A1A1 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42A6FF
#42A6FF
oklch(70.8% 0.16 249)
- #DE8C00
#DE8C00
oklch(70.8% 0.155 68.9)
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 #42A6FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.047
- Cornflower Blue #6495ED ΔE 0.050
- Dodger Blue #1E90FF ΔE 0.065
- Deep Sky Blue #00BFFF ΔE 0.067
- Dark Sky Blue #448EE4 ΔE 0.069
- Periwinkle Blue #8F99FB ΔE 0.077
- Soft Blue #6488EA ΔE 0.079
- Carolina Blue #8AB8FE ΔE 0.087
Use #42A6FF 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.