#428FD6
Closest named color: Dark Sky Blue (#448EE4). oklch(63.4% 0.131 249), rgb(66, 143, 214).
Aa
Black text reads best on this color (6.13:1).
About this color
#428FD6 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.131 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.022 away. Black text reads best on it, at 6.13:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.13:1 |
| White text | 3.42:1 |
Values
| HEX | #428FD6 |
| RGB | rgb(66, 143, 214) |
| HSL | hsl(209, 64%, 55%) |
| OKLCH | oklch(63.4% 0.131 249) |
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 #428FD6 | 3.42:1 | AA large text | Lc -66.9 | Content text, not long reading |
| Black text on #428FD6 | 6.13:1 | AA | Lc 42.6 | Non-text elements, placeholder text |
| #428FD6 text on white | 3.42:1 | AA large text | Lc 61.5 | Content text, not long reading |
| #428FD6 text on black | 6.13:1 | AA | Lc -40.2 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A1C5E9
oklch(81% 0.064 248.6)
-
Step 400
400
#6CA6DE
oklch(70.8% 0.103 248.6)
-
Step 500
500 (this color)
#428FD6
oklch(63.4% 0.131 249)
-
Step 600
600
#1977C2
oklch(55.6% 0.142 248.8)
-
Step 700
700
#0763A8
oklch(49% 0.133 249.4)
-
Step 800
800
#0E5188
oklch(42.6% 0.111 249.4)
-
Step 900
900
#16446D
oklch(37.8% 0.086 249.1)
-
Step 950
950
#0F2840
oklch(27% 0.055 249.7)
#428FD6 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) | #6F92D9 | 0.046 |
| Deuteranopia (no green cones) | #5A84D5 | 0.034 |
| Tritanopia (no blue cones) | #00A0A9 | 0.099 |
| Achromatopsia (no color) | #8B8B8B | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428FD6
#428FD6
oklch(63.4% 0.131 249)
- #BD7918
#BD7918
oklch(63.3% 0.131 68.6)
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 #428FD6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.022
- Chefchaouen Blue #4895EF ΔE 0.039
- Water Blue #0E87CC ΔE 0.040
- Faded Blue #658CBB ΔE 0.049
- Cool Blue #4984B8 ΔE 0.049
- Soft Blue #6488EA ΔE 0.050
- Cornflower Blue #6495ED ΔE 0.051
- Steel Blue #4682B4 ΔE 0.057
Use #428FD6 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.