#428DB6
Closest named color: Cool Blue (#4984B8). oklch(61.3% 0.097 235.3), rgb(66, 141, 182).
Aa
Black text reads best on this color (5.71:1).
About this color
#428DB6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.097 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.027 away. Black text reads best on it, at 5.71:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.71:1 |
| White text | 3.67:1 |
Values
| HEX | #428DB6 |
| RGB | rgb(66, 141, 182) |
| HSL | hsl(201, 47%, 49%) |
| OKLCH | oklch(61.3% 0.097 235.3) |
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 #428DB6 | 3.67:1 | AA large text | Lc -69.6 | Content text, not long reading |
| Black text on #428DB6 | 5.71:1 | AA | Lc 40.0 | Non-text elements, placeholder text |
| #428DB6 text on white | 3.67:1 | AA large text | Lc 64.1 | Content text, not long reading |
| #428DB6 text on black | 5.71:1 | AA | Lc -37.6 | 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
#C9DCE8
oklch(88.4% 0.026 235.4)
-
Step 300
300
#A4C6DB
oklch(80.9% 0.047 235.3)
-
Step 400
400
#71A9C9
oklch(70.8% 0.075 234.4)
-
Step 500
500 (this color)
#428DB6
oklch(61.3% 0.097 235.3)
-
Step 600
600
#247CA8
oklch(55.6% 0.105 235.5)
-
Step 700
700
#146890
oklch(49% 0.098 235.7)
-
Step 800
800
#155575
oklch(42.6% 0.081 235.7)
-
Step 900
900
#1A475E
oklch(37.8% 0.063 234.2)
-
Step 950
950
#112937
oklch(26.9% 0.04 236.4)
#428DB6 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) | #798CB8 | 0.059 |
| Deuteranopia (no green cones) | #6980B5 | 0.050 |
| Tritanopia (no blue cones) | #00989B | 0.066 |
| Achromatopsia (no color) | #858585 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428DB6
#428DB6
oklch(61.3% 0.097 235.3)
- #B17449
#B17449
oklch(61.4% 0.097 55)
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 #428DB6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.027
- Off Blue #5684AE ΔE 0.028
- Blue NCS #118AB2 ΔE 0.029
- Steel Blue #4682B4 ΔE 0.031
- Faded Blue #658CBB ΔE 0.036
- Water Blue #0E87CC ΔE 0.049
- Teal Blue #01889F ΔE 0.050
Use #428DB6 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.