#6478C8
Closest named color: Windows Blue (#3778BF). oklch(59.3% 0.124 271.6), rgb(100, 120, 200).
Aa
Black text reads best on this color (5.06:1).
About this color
#6478C8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.124 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.050 away. Black text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.06:1 |
| White text | 4.14:1 |
Values
| HEX | #6478C8 |
| RGB | rgb(100, 120, 200) |
| HSL | hsl(228, 48%, 59%) |
| OKLCH | oklch(59.3% 0.124 271.6) |
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 #6478C8 | 4.14:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #6478C8 | 5.06:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #6478C8 text on white | 4.14:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #6478C8 text on black | 5.06:1 | AA | Lc -33.2 | 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 600.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D1D8EE
oklch(88.4% 0.031 271.7)
-
Step 300
300
#B3BFE6
oklch(80.8% 0.057 271.7)
-
Step 400
400
#8C9ED9
oklch(70.8% 0.089 270.9)
-
Step 500
500
#7184CF
oklch(63.1% 0.115 272)
-
Step 600
600 (this color)
#6478C8
oklch(59.3% 0.124 271.6)
-
Step 700
700
#4A5BA2
oklch(49.2% 0.115 271.5)
-
Step 800
800
#3C4A83
oklch(42.6% 0.096 271.4)
-
Step 900
900
#333E69
oklch(37.6% 0.075 271.5)
-
Step 950
950
#1E253E
oklch(27.1% 0.048 271.1)
#6478C8 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) | #5981CB | 0.025 |
| Deuteranopia (no green cones) | #4E78C6 | 0.026 |
| Tritanopia (no blue cones) | #3A8996 | 0.112 |
| Achromatopsia (no color) | #7C7C7C | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6478C8
#6478C8
oklch(59.3% 0.124 271.6)
- #997B00
#997B00
oklch(59.4% 0.122 91.6)
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 #6478C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.050
- Cool Blue #4984B8 ΔE 0.053
- Steel Blue #4682B4 ΔE 0.056
- Off Blue #5684AE ΔE 0.060
- Soft Blue #6488EA ΔE 0.061
- Faded Blue #658CBB ΔE 0.064
- Dusty Blue #5A86AD ΔE 0.065
- Dark Periwinkle #665FD1 ΔE 0.067
Use #6478C8 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.