#428CB4
Closest named color: Dusty Blue (#5A86AD). oklch(61% 0.095 235), rgb(66, 140, 180).
Aa
Black text reads best on this color (5.64:1).
About this color
#428CB4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.095 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.026 away. Black text reads best on it, at 5.64:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.64:1 |
| White text | 3.72:1 |
Values
| HEX | #428CB4 |
| RGB | rgb(66, 140, 180) |
| HSL | hsl(201, 46%, 48%) |
| OKLCH | oklch(61% 0.095 235) |
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 #428CB4 | 3.72:1 | AA large text | Lc -70.1 | Content text, not long reading |
| Black text on #428CB4 | 5.64:1 | AA | Lc 39.5 | Non-text elements, placeholder text |
| #428CB4 text on white | 3.72:1 | AA large text | Lc 64.6 | Content text, not long reading |
| #428CB4 text on black | 5.64:1 | AA | Lc -37.1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF2
oklch(93.7% 0.013 233.7)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A4C6DB
oklch(80.9% 0.047 235.3)
-
Step 400
400
#72A8C9
oklch(70.6% 0.075 236.1)
-
Step 500
500 (this color)
#428CB4
oklch(61% 0.095 235)
-
Step 600
600
#257CA7
oklch(55.6% 0.104 235.1)
-
Step 700
700
#16688F
oklch(49% 0.096 235.3)
-
Step 800
800
#175574
oklch(42.6% 0.08 235.3)
-
Step 900
900
#1B475E
oklch(37.8% 0.062 234.6)
-
Step 950
950
#112937
oklch(26.9% 0.04 236.4)
#428CB4 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) | #798BB6 | 0.059 |
| Deuteranopia (no green cones) | #697FB3 | 0.050 |
| Tritanopia (no blue cones) | #009699 | 0.065 |
| Achromatopsia (no color) | #848484 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428CB4
#428CB4
oklch(61% 0.095 235)
- #AF7349
#AF7349
oklch(61% 0.095 54.9)
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 #428CB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.026
- Cool Blue #4984B8 ΔE 0.026
- Off Blue #5684AE ΔE 0.026
- Blue NCS #118AB2 ΔE 0.027
- Steel Blue #4682B4 ΔE 0.029
- Faded Blue #658CBB ΔE 0.037
- Teal Blue #01889F ΔE 0.048
- Water Blue #0E87CC ΔE 0.049
Use #428CB4 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.