#428BA9
Closest named color: Dusty Blue (#5A86AD). oklch(60.2% 0.086 227.7), rgb(66, 139, 169).
Aa
Black text reads best on this color (5.49:1).
About this color
#428BA9 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.086 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.028 away. Black text reads best on it, at 5.49:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.49:1 |
| White text | 3.81:1 |
Values
| HEX | #428BA9 |
| RGB | rgb(66, 139, 169) |
| HSL | hsl(197, 44%, 46%) |
| OKLCH | oklch(60.2% 0.086 227.7) |
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 #428BA9 | 3.81:1 | AA large text | Lc -71.0 | Content text, not long reading |
| Black text on #428BA9 | 5.49:1 | AA | Lc 38.6 | Non-text elements, placeholder text |
| #428BA9 text on white | 3.81:1 | AA large text | Lc 65.5 | Content text, not long reading |
| #428BA9 text on black | 5.49:1 | AA | Lc -36.2 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE5
oklch(88.6% 0.023 224.9)
-
Step 300
300
#A5C7D6
oklch(81% 0.042 226.4)
-
Step 400
400
#73A9C1
oklch(70.6% 0.067 227.6)
-
Step 500
500 (this color)
#428BA9
oklch(60.2% 0.086 227.7)
-
Step 600
600
#297E9E
oklch(55.7% 0.093 227.5)
-
Step 700
700
#1A6A87
oklch(49.2% 0.086 227.6)
-
Step 800
800
#19566E
oklch(42.6% 0.072 228.6)
-
Step 900
900
#1C4759
oklch(37.6% 0.056 228.6)
-
Step 950
950
#122A34
oklch(27.1% 0.035 227.4)
#428BA9 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) | #7B89AB | 0.063 |
| Deuteranopia (no green cones) | #6D7EA9 | 0.055 |
| Tritanopia (no blue cones) | #009495 | 0.055 |
| Achromatopsia (no color) | #828282 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428BA9
#428BA9
oklch(60.2% 0.086 227.7)
- #AB7153
#AB7153
oklch(60.3% 0.085 48)
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 #428BA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.028
- Blue NCS #118AB2 ΔE 0.028
- Off Blue #5684AE ΔE 0.029
- Steel Blue #4682B4 ΔE 0.035
- Cool Blue #4984B8 ΔE 0.036
- Teal Blue #01889F ΔE 0.036
- Stormy Blue #507B9C ΔE 0.045
- Cerulean #457B9D ΔE 0.046
Use #428BA9 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.