#428DC5
Closest named color: Cool Blue (#4984B8). oklch(62.1% 0.113 243.7), rgb(66, 141, 197).
Aa
Black text reads best on this color (5.84:1).
About this color
#428DC5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.113 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.028 away. Black text reads best on it, at 5.84:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.84:1 |
| White text | 3.59:1 |
Values
| HEX | #428DC5 |
| RGB | rgb(66, 141, 197) |
| HSL | hsl(206, 53%, 52%) |
| OKLCH | oklch(62.1% 0.113 243.7) |
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 #428DC5 | 3.59:1 | AA large text | Lc -68.7 | Content text, not long reading |
| Black text on #428DC5 | 5.84:1 | AA | Lc 40.8 | Non-text elements, placeholder text |
| #428DC5 text on white | 3.59:1 | AA large text | Lc 63.2 | Content text, not long reading |
| #428DC5 text on black | 5.84:1 | AA | Lc -38.4 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A3C5E2
oklch(80.8% 0.055 244.3)
-
Step 400
400
#6FA7D4
oklch(70.7% 0.089 243.7)
-
Step 500
500 (this color)
#428DC5
oklch(62.1% 0.113 243.7)
-
Step 600
600
#2079B5
oklch(55.5% 0.123 243.9)
-
Step 700
700
#10669C
oklch(49.1% 0.114 243.7)
-
Step 800
800
#13537E
oklch(42.6% 0.094 243.8)
-
Step 900
900
#194566
oklch(37.7% 0.074 244.5)
-
Step 950
950
#10293B
oklch(27.1% 0.046 242.4)
#428DC5 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) | #748EC7 | 0.052 |
| Deuteranopia (no green cones) | #6281C4 | 0.042 |
| Tritanopia (no blue cones) | #009BA1 | 0.083 |
| Achromatopsia (no color) | #878787 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428DC5
#428DC5
oklch(62.1% 0.113 243.7)
- #B57635
#B57635
oklch(62% 0.113 63.7)
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 #428DC5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.028
- Faded Blue #658CBB ΔE 0.035
- Steel Blue #4682B4 ΔE 0.035
- Water Blue #0E87CC ΔE 0.036
- Off Blue #5684AE ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.040
- Blue NCS #118AB2 ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.047
Use #428DC5 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.