#428CDF
Closest named color: Dark Sky Blue (#448EE4). oklch(63.2% 0.145 253.3), rgb(66, 140, 223).
Aa
Black text reads best on this color (6.04:1).
About this color
#428CDF is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.145 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.009 away. Black text reads best on it, at 6.04:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.04:1 |
| White text | 3.47:1 |
Values
| HEX | #428CDF |
| RGB | rgb(66, 140, 223) |
| HSL | hsl(212, 71%, 57%) |
| OKLCH | oklch(63.2% 0.145 253.3) |
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 #428CDF | 3.47:1 | AA large text | Lc -67.4 | Content text, not long reading |
| Black text on #428CDF | 6.04:1 | AA | Lc 42.1 | Non-text elements, placeholder text |
| #428CDF text on white | 3.47:1 | AA large text | Lc 61.9 | Content text, not long reading |
| #428CDF text on black | 6.04:1 | AA | Lc -39.7 | 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
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#A1C4EE
oklch(80.9% 0.071 253.2)
-
Step 400
400
#6CA4E6
oklch(70.7% 0.114 253.3)
-
Step 500
500 (this color)
#428CDF
oklch(63.2% 0.145 253.3)
-
Step 600
600
#1C74CC
oklch(55.7% 0.157 253.1)
-
Step 700
700
#0B61B1
oklch(49.2% 0.147 253.1)
-
Step 800
800
#104F8F
oklch(42.7% 0.122 253.4)
-
Step 900
900
#164272
oklch(37.6% 0.095 253.4)
-
Step 950
950
#0F2743
oklch(27% 0.06 253.9)
#428CDF 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) | #6692E2 | 0.040 |
| Deuteranopia (no green cones) | #4F83DD | 0.024 |
| Tritanopia (no blue cones) | #009FAB | 0.111 |
| Achromatopsia (no color) | #8A8A8A | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428CDF
#428CDF
oklch(63.2% 0.145 253.3)
- #BA7B00
#BA7B00
oklch(63.3% 0.134 73.4)
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 #428CDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.009
- Chefchaouen Blue #4895EF ΔE 0.032
- Soft Blue #6488EA ΔE 0.038
- Water Blue #0E87CC ΔE 0.043
- Cornflower Blue #6495ED ΔE 0.047
- Dodger Blue #1E90FF ΔE 0.049
- Cool Blue #4984B8 ΔE 0.059
- Faded Blue #658CBB ΔE 0.062
Use #428CDF 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.