#6579CC
Closest named color: Windows Blue (#3778BF). oklch(59.8% 0.129 271.8), rgb(101, 121, 204).
Aa
Black text reads best on this color (5.16:1).
About this color
#6579CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.129 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 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #6579CC |
| RGB | rgb(101, 121, 204) |
| HSL | hsl(228, 50%, 60%) |
| OKLCH | oklch(59.8% 0.129 271.8) |
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 #6579CC | 4.06:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #6579CC | 5.16:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #6579CC text on white | 4.06:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #6579CC text on black | 5.16:1 | AA | Lc -33.9 | 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
#E5E9F6
oklch(93.5% 0.018 272.3)
-
Step 200
200
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B2BFEA
oklch(80.9% 0.063 271.8)
-
Step 400
400
#8A9DE0
oklch(70.7% 0.101 271.5)
-
Step 500
500 (this color)
#6579CC
oklch(59.8% 0.129 271.8)
-
Step 600
600
#576BC4
oklch(55.6% 0.139 271.7)
-
Step 700
700
#4859AA
oklch(49.2% 0.13 271.9)
-
Step 800
800
#3B4989
oklch(42.7% 0.107 271.9)
-
Step 900
900
#323E6E
oklch(37.8% 0.083 271.3)
-
Step 950
950
#1D2440
oklch(26.9% 0.053 271.8)
#6579CC 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) | #5883CF | 0.028 |
| Deuteranopia (no green cones) | #4D7ACA | 0.028 |
| Tritanopia (no blue cones) | #398B99 | 0.115 |
| Achromatopsia (no color) | #7E7E7E | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6579CC
#6579CC
oklch(59.8% 0.129 271.8)
- #9A7C00
#9A7C00
oklch(59.8% 0.122 91.8)
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 #6579CC, 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 0.055
- Cool Blue #4984B8 ΔE 0.056
- Steel Blue #4682B4 ΔE 0.060
- Dark Sky Blue #448EE4 ΔE 0.064
- Off Blue #5684AE ΔE 0.064
- Faded Blue #658CBB ΔE 0.064
- Cornflower #6A79F7 ΔE 0.066
Use #6579CC 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.