#428FC8
Closest named color: Cool Blue (#4984B8). oklch(62.7% 0.115 243.6), rgb(66, 143, 200).
Aa
Black text reads best on this color (5.99:1).
About this color
#428FC8 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.115 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.034 away. Black text reads best on it, at 5.99:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.99:1 |
| White text | 3.50:1 |
Values
| HEX | #428FC8 |
| RGB | rgb(66, 143, 200) |
| HSL | hsl(206, 55%, 52%) |
| OKLCH | oklch(62.7% 0.115 243.6) |
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 #428FC8 | 3.50:1 | AA large text | Lc -67.8 | Content text, not long reading |
| Black text on #428FC8 | 5.99:1 | AA | Lc 41.7 | Non-text elements, placeholder text |
| #428FC8 text on white | 3.50:1 | AA large text | Lc 62.3 | Content text, not long reading |
| #428FC8 text on black | 5.99:1 | AA | Lc -39.3 | 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
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A2C5E3
oklch(80.8% 0.057 244.4)
-
Step 400
400
#6EA7D5
oklch(70.7% 0.09 243.9)
-
Step 500
500 (this color)
#428FC8
oklch(62.7% 0.115 243.6)
-
Step 600
600
#1D79B6
oklch(55.5% 0.125 243.9)
-
Step 700
700
#0B669D
oklch(49.1% 0.116 243.6)
-
Step 800
800
#10537F
oklch(42.6% 0.096 243.8)
-
Step 900
900
#174566
oklch(37.6% 0.075 243.7)
-
Step 950
950
#0F293C
oklch(27.1% 0.048 243)
#428FC8 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) | #7590CB | 0.053 |
| Deuteranopia (no green cones) | #6383C7 | 0.042 |
| Tritanopia (no blue cones) | #009DA3 | 0.084 |
| Achromatopsia (no color) | #898989 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428FC8
#428FC8
oklch(62.7% 0.115 243.6)
- #B87835
#B87835
oklch(62.7% 0.115 64)
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 #428FC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.034
- Faded Blue #658CBB ΔE 0.036
- Water Blue #0E87CC ΔE 0.038
- Steel Blue #4682B4 ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.044
- Off Blue #5684AE ΔE 0.044
- Dusty Blue #5A86AD ΔE 0.044
- Blue NCS #118AB2 ΔE 0.046
Use #428FC8 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.