#428FD2
Closest named color: Dark Sky Blue (#448EE4). oklch(63.2% 0.127 247.7), rgb(66, 143, 210).
Aa
Black text reads best on this color (6.09:1).
About this color
#428FD2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.127 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.028 away. Black text reads best on it, at 6.09:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.09:1 |
| White text | 3.44:1 |
Values
| HEX | #428FD2 |
| RGB | rgb(66, 143, 210) |
| HSL | hsl(208, 62%, 54%) |
| OKLCH | oklch(63.2% 0.127 247.7) |
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 #428FD2 | 3.44:1 | AA large text | Lc -67.2 | Content text, not long reading |
| Black text on #428FD2 | 6.09:1 | AA | Lc 42.3 | Non-text elements, placeholder text |
| #428FD2 text on white | 3.44:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #428FD2 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
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A1C5E7
oklch(80.9% 0.062 247.1)
-
Step 400
400
#6DA6DB
oklch(70.7% 0.098 247.6)
-
Step 500
500 (this color)
#428FD2
oklch(63.2% 0.127 247.7)
-
Step 600
600
#1A78BF
oklch(55.7% 0.137 247.4)
-
Step 700
700
#0864A5
oklch(49.1% 0.128 247.9)
-
Step 800
800
#0F5285
oklch(42.7% 0.105 247.5)
-
Step 900
900
#16446B
oklch(37.6% 0.083 247.9)
-
Step 950
950
#0F283F
oklch(27% 0.053 248.7)
#428FD2 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) | #7192D5 | 0.049 |
| Deuteranopia (no green cones) | #5D84D1 | 0.036 |
| Tritanopia (no blue cones) | #009FA7 | 0.095 |
| Achromatopsia (no color) | #8A8A8A | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428FD2
#428FD2
oklch(63.2% 0.127 247.7)
- #BB7922
#BB7922
oklch(63.1% 0.126 68)
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 #428FD2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.028
- Water Blue #0E87CC ΔE 0.038
- Cool Blue #4984B8 ΔE 0.044
- Faded Blue #658CBB ΔE 0.044
- Chefchaouen Blue #4895EF ΔE 0.045
- Steel Blue #4682B4 ΔE 0.052
- Soft Blue #6488EA ΔE 0.055
- Cornflower Blue #6495ED ΔE 0.055
Use #428FD2 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.