#428CE4
Closest named color: Dark Sky Blue (#448EE4). oklch(63.5% 0.152 254.5), rgb(66, 140, 228).
Aa
Black text reads best on this color (6.10:1).
About this color
#428CE4 is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.152 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.006 away. Black text reads best on it, at 6.10:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.10:1 |
| White text | 3.44:1 |
Values
| HEX | #428CE4 |
| RGB | rgb(66, 140, 228) |
| HSL | hsl(213, 75%, 58%) |
| OKLCH | oklch(63.5% 0.152 254.5) |
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 #428CE4 | 3.44:1 | AA large text | Lc -67.1 | Content text, not long reading |
| Black text on #428CE4 | 6.10:1 | AA | Lc 42.5 | Non-text elements, placeholder text |
| #428CE4 text on white | 3.44:1 | AA large text | Lc 61.6 | Content text, not long reading |
| #428CE4 text on black | 6.10:1 | AA | Lc -40.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C4F0
oklch(81% 0.074 253.7)
-
Step 400
400
#6BA3E9
oklch(70.6% 0.119 254.6)
-
Step 500
500 (this color)
#428CE4
oklch(63.5% 0.152 254.5)
-
Step 600
600
#1B72D0
oklch(55.5% 0.165 254.6)
-
Step 700
700
#0A5FB5
oklch(49% 0.155 254.7)
-
Step 800
800
#0F4E92
oklch(42.6% 0.127 254.6)
-
Step 900
900
#164274
oklch(37.7% 0.098 254.2)
-
Step 950
950
#0E2744
oklch(27% 0.062 253.9)
#428CE4 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) | #6392E8 | 0.037 |
| Deuteranopia (no green cones) | #4A83E2 | 0.023 |
| Tritanopia (no blue cones) | #00A1AD | 0.118 |
| Achromatopsia (no color) | #8A8A8A | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428CE4
#428CE4
oklch(63.5% 0.152 254.5)
- #BA7C00
#BA7C00
oklch(63.5% 0.134 74.1)
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 #428CE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.006
- Chefchaouen Blue #4895EF ΔE 0.028
- Soft Blue #6488EA ΔE 0.035
- Dodger Blue #1E90FF ΔE 0.042
- Cornflower Blue #6495ED ΔE 0.044
- Water Blue #0E87CC ΔE 0.049
- Cool Blue #4984B8 ΔE 0.066
- Clear Blue #247AFD ΔE 0.068
Use #428CE4 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.