#428BAF
Closest named color: Dusty Blue (#5A86AD). oklch(60.5% 0.091 232.4), rgb(66, 139, 175).
Aa
Black text reads best on this color (5.54:1).
About this color
#428BAF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.091 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.024 away. Black text reads best on it, at 5.54:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.54:1 |
| White text | 3.78:1 |
Values
| HEX | #428BAF |
| RGB | rgb(66, 139, 175) |
| HSL | hsl(200, 45%, 47%) |
| OKLCH | oklch(60.5% 0.091 232.4) |
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 #428BAF | 3.78:1 | AA large text | Lc -70.7 | Content text, not long reading |
| Black text on #428BAF | 5.54:1 | AA | Lc 38.9 | Non-text elements, placeholder text |
| #428BAF text on white | 3.78:1 | AA large text | Lc 65.2 | Content text, not long reading |
| #428BAF text on black | 5.54:1 | AA | Lc -36.5 | 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
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#CADCE7
oklch(88.4% 0.025 234.5)
-
Step 300
300
#A5C6D9
oklch(80.9% 0.044 233.3)
-
Step 400
400
#73A9C6
oklch(70.8% 0.071 232.6)
-
Step 500
500 (this color)
#428BAF
oklch(60.5% 0.091 232.4)
-
Step 600
600
#287DA3
oklch(55.7% 0.098 232)
-
Step 700
700
#18698C
oklch(49.1% 0.092 232.5)
-
Step 800
800
#185671
oklch(42.8% 0.075 231.5)
-
Step 900
900
#1C475C
oklch(37.8% 0.059 232.6)
-
Step 950
950
#122A36
oklch(27.2% 0.037 232.2)
#428BAF 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) | #7989B1 | 0.060 |
| Deuteranopia (no green cones) | #6A7EAE | 0.052 |
| Tritanopia (no blue cones) | #009597 | 0.061 |
| Achromatopsia (no color) | #838383 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428BAF
#428BAF
oklch(60.5% 0.091 232.4)
- #AD724D
#AD724D
oklch(60.6% 0.091 52.3)
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 #428BAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.024
- Off Blue #5684AE ΔE 0.025
- Blue NCS #118AB2 ΔE 0.026
- Cool Blue #4984B8 ΔE 0.028
- Steel Blue #4682B4 ΔE 0.029
- Faded Blue #658CBB ΔE 0.041
- Teal Blue #01889F ΔE 0.042
- Stormy Blue #507B9C ΔE 0.047
Use #428BAF 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.