#6578CC
Closest named color: Windows Blue (#3778BF). oklch(59.6% 0.13 272.3), rgb(101, 120, 204).
Aa
Black text reads best on this color (5.11:1).
About this color
#6578CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.130 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.054 away. Black text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #6578CC |
| RGB | rgb(101, 120, 204) |
| HSL | hsl(229, 50%, 60%) |
| OKLCH | oklch(59.6% 0.13 272.3) |
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 #6578CC | 4.10:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #6578CC | 5.11:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #6578CC text on white | 4.10:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #6578CC text on black | 5.11:1 | AA | Lc -33.6 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B2BFEB
oklch(81% 0.064 272)
-
Step 400
400
#8B9CE0
oklch(70.6% 0.102 272.8)
-
Step 500
500 (this color)
#6578CC
oklch(59.6% 0.13 272.3)
-
Step 600
600
#586BC5
oklch(55.7% 0.141 272.1)
-
Step 700
700
#4858AA
oklch(49% 0.132 272.4)
-
Step 800
800
#3B498A
oklch(42.8% 0.108 271.9)
-
Step 900
900
#323D6E
oklch(37.6% 0.085 272.2)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#6578CC 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) | #5682CF | 0.029 |
| Deuteranopia (no green cones) | #4C79CA | 0.029 |
| Tritanopia (no blue cones) | #398A98 | 0.116 |
| Achromatopsia (no color) | #7D7D7D | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6578CC
#6578CC
oklch(59.6% 0.13 272.3)
- #997C00
#997C00
oklch(59.7% 0.122 92.4)
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 #6578CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.054
- Soft Blue #6488EA ΔE 0.056
- Cool Blue #4984B8 ΔE 0.058
- Steel Blue #4682B4 ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.065
- Dark Sky Blue #448EE4 ΔE 0.066
- Cornflower #6A79F7 ΔE 0.066
- Off Blue #5684AE ΔE 0.066
Use #6578CC 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.