#428AAF
Closest named color: Off Blue (#5684AE). oklch(60.3% 0.091 233.5), rgb(66, 138, 175).
Aa
Black text reads best on this color (5.48:1).
About this color
#428AAF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.091 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.023 away. Black text reads best on it, at 5.48:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.48:1 |
| White text | 3.82:1 |
Values
| HEX | #428AAF |
| RGB | rgb(66, 138, 175) |
| HSL | hsl(200, 45%, 47%) |
| OKLCH | oklch(60.3% 0.091 233.5) |
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 #428AAF | 3.82:1 | AA large text | Lc -71.1 | Content text, not long reading |
| Black text on #428AAF | 5.48:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #428AAF text on white | 3.82:1 | AA large text | Lc 65.6 | Content text, not long reading |
| #428AAF text on black | 5.48:1 | AA | Lc -36.1 | 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
#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)
#428AAF
oklch(60.3% 0.091 233.5)
-
Step 600
600
#297CA4
oklch(55.5% 0.099 233.9)
-
Step 700
700
#1A698D
oklch(49.2% 0.092 233.6)
-
Step 800
800
#195572
oklch(42.6% 0.077 234)
-
Step 900
900
#1C475C
oklch(37.8% 0.059 232.6)
-
Step 950
950
#122936
oklch(26.9% 0.038 235.3)
#428AAF 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) | #7889B1 | 0.059 |
| Deuteranopia (no green cones) | #697DAE | 0.051 |
| Tritanopia (no blue cones) | #009496 | 0.063 |
| Achromatopsia (no color) | #828282 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428AAF
#428AAF
oklch(60.3% 0.091 233.5)
- #AC714B
#AC714B
oklch(60.2% 0.092 52.9)
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 #428AAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.023
- Dusty Blue #5A86AD ΔE 0.023
- Blue NCS #118AB2 ΔE 0.025
- Cool Blue #4984B8 ΔE 0.026
- Steel Blue #4682B4 ΔE 0.026
- Teal Blue #01889F ΔE 0.041
- Faded Blue #658CBB ΔE 0.042
- Stormy Blue #507B9C ΔE 0.045
Use #428AAF 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.