#428ED8
Closest named color: Dark Sky Blue (#448EE4). oklch(63.3% 0.135 250.3), rgb(66, 142, 216).
Aa
Black text reads best on this color (6.09:1).
About this color
#428ED8 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.135 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.019 away. Black text reads best on it, at 6.09:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.09:1 |
| White text | 3.44:1 |
Values
| HEX | #428ED8 |
| RGB | rgb(66, 142, 216) |
| HSL | hsl(210, 66%, 55%) |
| OKLCH | oklch(63.3% 0.135 250.3) |
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 #428ED8 | 3.44:1 | AA large text | Lc -67.2 | Content text, not long reading |
| Black text on #428ED8 | 6.09:1 | AA | Lc 42.4 | Non-text elements, placeholder text |
| #428ED8 text on white | 3.44:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #428ED8 text on black | 6.09:1 | AA | Lc -40.0 | 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
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DCF1
oklch(88.6% 0.036 249.5)
-
Step 300
300
#A1C4EA
oklch(80.8% 0.066 250.7)
-
Step 400
400
#6CA5E0
oklch(70.6% 0.106 250.3)
-
Step 500
500 (this color)
#428ED8
oklch(63.3% 0.135 250.3)
-
Step 600
600
#1A76C5
oklch(55.6% 0.147 250.3)
-
Step 700
700
#0963AA
oklch(49.2% 0.136 250.1)
-
Step 800
800
#0F518A
oklch(42.8% 0.113 250.3)
-
Step 900
900
#16436E
oklch(37.6% 0.088 250.6)
-
Step 950
950
#0F2840
oklch(27% 0.055 249.7)
#428ED8 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) | #6D92DB | 0.045 |
| Deuteranopia (no green cones) | #5784D7 | 0.030 |
| Tritanopia (no blue cones) | #009FA9 | 0.101 |
| Achromatopsia (no color) | #8A8A8A | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428ED8
#428ED8
oklch(63.3% 0.135 250.3)
- #BD7909
#BD7909
oklch(63.3% 0.135 70)
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 #428ED8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.019
- Chefchaouen Blue #4895EF ΔE 0.038
- Water Blue #0E87CC ΔE 0.039
- Soft Blue #6488EA ΔE 0.047
- Cornflower Blue #6495ED ΔE 0.050
- Cool Blue #4984B8 ΔE 0.050
- Faded Blue #658CBB ΔE 0.052
- Steel Blue #4682B4 ΔE 0.058
Use #428ED8 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.