#428DD2
Closest named color: Dark Sky Blue (#448EE4). oklch(62.7% 0.128 248.9), rgb(66, 141, 210).
Aa
Black text reads best on this color (5.97:1).
About this color
#428DD2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.128 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.027 away. Black text reads best on it, at 5.97:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.97:1 |
| White text | 3.51:1 |
Values
| HEX | #428DD2 |
| RGB | rgb(66, 141, 210) |
| HSL | hsl(209, 62%, 54%) |
| OKLCH | oklch(62.7% 0.128 248.9) |
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 #428DD2 | 3.51:1 | AA large text | Lc -67.9 | Content text, not long reading |
| Black text on #428DD2 | 5.97:1 | AA | Lc 41.6 | Non-text elements, placeholder text |
| #428DD2 text on white | 3.51:1 | AA large text | Lc 62.5 | Content text, not long reading |
| #428DD2 text on black | 5.97:1 | AA | Lc -39.2 | 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
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A2C5E8
oklch(81% 0.062 248.6)
-
Step 400
400
#6DA6DD
oklch(70.8% 0.101 248.6)
-
Step 500
500 (this color)
#428DD2
oklch(62.7% 0.128 248.9)
-
Step 600
600
#1D77C0
oklch(55.6% 0.139 248.6)
-
Step 700
700
#0D64A6
oklch(49.2% 0.129 248.7)
-
Step 800
800
#115187
oklch(42.6% 0.108 249.5)
-
Step 900
900
#17446C
oklch(37.7% 0.084 248.9)
-
Step 950
950
#0F283F
oklch(27% 0.053 248.7)
#428DD2 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) | #6E90D5 | 0.046 |
| Deuteranopia (no green cones) | #5A82D1 | 0.034 |
| Tritanopia (no blue cones) | #009DA6 | 0.096 |
| Achromatopsia (no color) | #898989 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428DD2
#428DD2
oklch(62.7% 0.128 248.9)
- #BA781B
#BA781B
oklch(62.8% 0.128 68.9)
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 #428DD2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.027
- Water Blue #0E87CC ΔE 0.035
- Cool Blue #4984B8 ΔE 0.042
- Faded Blue #658CBB ΔE 0.046
- Chefchaouen Blue #4895EF ΔE 0.046
- Steel Blue #4682B4 ΔE 0.049
- Soft Blue #6488EA ΔE 0.053
- Off Blue #5684AE ΔE 0.055
Use #428DD2 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.