#428BF0
Closest named color: Dark Sky Blue (#448EE4). oklch(64% 0.168 257.2), rgb(66, 139, 240).
Aa
Black text reads best on this color (6.18:1).
About this color
#428BF0 is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.168 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.021 away. Black text reads best on it, at 6.18:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.18:1 |
| White text | 3.39:1 |
Values
| HEX | #428BF0 |
| RGB | rgb(66, 139, 240) |
| HSL | hsl(215, 85%, 60%) |
| OKLCH | oklch(64% 0.168 257.2) |
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 #428BF0 | 3.39:1 | AA large text | Lc -66.5 | Content text, not long reading |
| Black text on #428BF0 | 6.18:1 | AA | Lc 43.0 | Non-text elements, placeholder text |
| #428BF0 text on white | 3.39:1 | AA large text | Lc 61.1 | Content text, not long reading |
| #428BF0 text on black | 6.18:1 | AA | Lc -40.6 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#9FC3F6
oklch(80.9% 0.082 257.1)
-
Step 400
400
#6AA2F1
oklch(70.7% 0.131 257.1)
-
Step 500
500 (this color)
#428BF0
oklch(64% 0.168 257.2)
-
Step 600
600
#1A6FDB
oklch(55.6% 0.183 257.3)
-
Step 700
700
#095CBE
oklch(49% 0.17 257.3)
-
Step 800
800
#0E4C9A
oklch(42.7% 0.141 257.2)
-
Step 900
900
#15407A
oklch(37.6% 0.109 257.2)
-
Step 950
950
#0E2648
oklch(27% 0.07 257.6)
#428BF0 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) | #5A94F4 | 0.035 |
| Deuteranopia (no green cones) | #3B84EE | 0.020 |
| Tritanopia (no blue cones) | #00A3B2 | 0.131 |
| Achromatopsia (no color) | #8B8B8B | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428BF0
#428BF0
oklch(64% 0.168 257.2)
- #B98000
#B98000
oklch(64.1% 0.134 77.4)
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 #428BF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.021
- Dodger Blue #1E90FF ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.028
- Soft Blue #6488EA ΔE 0.032
- Cornflower Blue #6495ED ΔE 0.045
- Clear Blue #247AFD ΔE 0.056
- Cornflower #6A79F7 ΔE 0.058
- Water Blue #0E87CC ΔE 0.063
Use #428BF0 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.