#428AB5
Closest named color: Cool Blue (#4984B8). oklch(60.6% 0.097 237.6), rgb(66, 138, 181).
Aa
Black text reads best on this color (5.53:1).
About this color
#428AB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.097 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.019 away. Black text reads best on it, at 5.53:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.53:1 |
| White text | 3.79:1 |
Values
| HEX | #428AB5 |
| RGB | rgb(66, 138, 181) |
| HSL | hsl(202, 47%, 48%) |
| OKLCH | oklch(60.6% 0.097 237.6) |
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 #428AB5 | 3.79:1 | AA large text | Lc -70.8 | Content text, not long reading |
| Black text on #428AB5 | 5.53:1 | AA | Lc 38.8 | Non-text elements, placeholder text |
| #428AB5 text on white | 3.79:1 | AA large text | Lc 65.3 | Content text, not long reading |
| #428AB5 text on black | 5.53:1 | AA | Lc -36.4 | 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE9
oklch(88.5% 0.026 239.1)
-
Step 300
300
#A5C6DC
oklch(81% 0.047 237.4)
-
Step 400
400
#72A8CB
oklch(70.7% 0.077 237.7)
-
Step 500
500 (this color)
#428AB5
oklch(60.6% 0.097 237.6)
-
Step 600
600
#287BA9
oklch(55.5% 0.105 237.7)
-
Step 700
700
#196891
oklch(49.1% 0.098 237.2)
-
Step 800
800
#185576
oklch(42.8% 0.081 237.2)
-
Step 900
900
#1C465F
oklch(37.7% 0.063 237.9)
-
Step 950
950
#122938
oklch(27% 0.04 239.2)
#428AB5 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) | #7689B7 | 0.056 |
| Deuteranopia (no green cones) | #667EB4 | 0.046 |
| Tritanopia (no blue cones) | #009599 | 0.068 |
| Achromatopsia (no color) | #838383 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428AB5
#428AB5
oklch(60.6% 0.097 237.6)
- #AD7244
#AD7244
oklch(60.4% 0.097 57.5)
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 #428AB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.019
- Steel Blue #4682B4 ΔE 0.023
- Off Blue #5684AE ΔE 0.023
- Dusty Blue #5A86AD ΔE 0.024
- Blue NCS #118AB2 ΔE 0.027
- Faded Blue #658CBB ΔE 0.038
- Water Blue #0E87CC ΔE 0.045
- Teal Blue #01889F ΔE 0.048
Use #428AB5 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.