#428BE7
Closest named color: Dark Sky Blue (#448EE4). oklch(63.5% 0.157 255.6), rgb(66, 139, 231).
Aa
Black text reads best on this color (6.07:1).
About this color
#428BE7 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.157 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.010 away. Black text reads best on it, at 6.07:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.07:1 |
| White text | 3.45:1 |
Values
| HEX | #428BE7 |
| RGB | rgb(66, 139, 231) |
| HSL | hsl(213, 77%, 58%) |
| OKLCH | oklch(63.5% 0.157 255.6) |
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 #428BE7 | 3.45:1 | AA large text | Lc -67.2 | Content text, not long reading |
| Black text on #428BE7 | 6.07:1 | AA | Lc 42.3 | Non-text elements, placeholder text |
| #428BE7 text on white | 3.45:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #428BE7 text on black | 6.07:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#A0C3F2
oklch(80.8% 0.077 255.9)
-
Step 400
400
#6BA3EC
oklch(70.7% 0.123 255.5)
-
Step 500
500 (this color)
#428BE7
oklch(63.5% 0.157 255.6)
-
Step 600
600
#1C71D4
oklch(55.5% 0.171 255.8)
-
Step 700
700
#0C5EB7
oklch(49% 0.158 255.7)
-
Step 800
800
#104E94
oklch(42.8% 0.13 255.3)
-
Step 900
900
#164176
oklch(37.6% 0.102 255.6)
-
Step 950
950
#0E2745
oklch(27.1% 0.064 254.6)
#428BE7 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) | #6092EB | 0.036 |
| Deuteranopia (no green cones) | #4583E5 | 0.021 |
| Tritanopia (no blue cones) | #00A1AE | 0.122 |
| Achromatopsia (no color) | #8A8A8A | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428BE7
#428BE7
oklch(63.5% 0.157 255.6)
- #B97D00
#B97D00
oklch(63.5% 0.134 75.3)
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 #428BE7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.010
- Chefchaouen Blue #4895EF ΔE 0.029
- Soft Blue #6488EA ΔE 0.033
- Dodger Blue #1E90FF ΔE 0.038
- Cornflower Blue #6495ED ΔE 0.045
- Water Blue #0E87CC ΔE 0.052
- Clear Blue #247AFD ΔE 0.063
- Cornflower #6A79F7 ΔE 0.064
Use #428BE7 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.