#428AE4
Closest named color: Dark Sky Blue (#448EE4). oklch(63.1% 0.154 255.4), rgb(66, 138, 228).
Aa
Black text reads best on this color (5.98:1).
About this color
#428AE4 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.154 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.011 away. Black text reads best on it, at 5.98:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.98:1 |
| White text | 3.50:1 |
Values
| HEX | #428AE4 |
| RGB | rgb(66, 138, 228) |
| HSL | hsl(213, 75%, 58%) |
| OKLCH | oklch(63.1% 0.154 255.4) |
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 #428AE4 | 3.50:1 | AA large text | Lc -67.8 | Content text, not long reading |
| Black text on #428AE4 | 5.98:1 | AA | Lc 41.8 | Non-text elements, placeholder text |
| #428AE4 text on white | 3.50:1 | AA large text | Lc 62.3 | Content text, not long reading |
| #428AE4 text on black | 5.98:1 | AA | Lc -39.4 | 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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A1C3F1
oklch(80.8% 0.075 256.1)
-
Step 400
400
#6CA3EA
oklch(70.7% 0.12 255.3)
-
Step 500
500 (this color)
#428AE4
oklch(63.1% 0.154 255.4)
-
Step 600
600
#1E72D2
oklch(55.7% 0.167 255.3)
-
Step 700
700
#0E5FB6
oklch(49.2% 0.155 255.3)
-
Step 800
800
#114E93
oklch(42.7% 0.128 255.2)
-
Step 900
900
#174175
oklch(37.6% 0.1 255.6)
-
Step 950
950
#0F2745
oklch(27.1% 0.064 255.3)
#428AE4 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) | #6091E8 | 0.036 |
| Deuteranopia (no green cones) | #4682E2 | 0.021 |
| Tritanopia (no blue cones) | #009FAC | 0.119 |
| Achromatopsia (no color) | #898989 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428AE4
#428AE4
oklch(63.1% 0.154 255.4)
- #B77C00
#B77C00
oklch(63.1% 0.133 75.6)
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 #428AE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.011
- Chefchaouen Blue #4895EF ΔE 0.033
- Soft Blue #6488EA ΔE 0.034
- Dodger Blue #1E90FF ΔE 0.042
- Water Blue #0E87CC ΔE 0.048
- Cornflower Blue #6495ED ΔE 0.048
- Clear Blue #247AFD ΔE 0.064
- Cornflower #6A79F7 ΔE 0.065
Use #428AE4 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.