#6573C4
Closest named color: Windows Blue (#3778BF). oklch(58.1% 0.125 274.5), rgb(101, 115, 196).
Aa
Black text reads best on this color (4.80:1).
About this color
#6573C4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.125 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.051 away. Black text reads best on it, at 4.80:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.80:1 |
| White text | 4.37:1 |
Values
| HEX | #6573C4 |
| RGB | rgb(101, 115, 196) |
| HSL | hsl(231, 45%, 58%) |
| OKLCH | oklch(58.1% 0.125 274.5) |
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 #6573C4 | 4.37:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #6573C4 | 4.80:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #6573C4 text on white | 4.37:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #6573C4 text on black | 4.80:1 | AA | Lc -31.5 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B5BFE6
oklch(81% 0.056 273.8)
-
Step 400
400
#8F9CD9
oklch(70.6% 0.091 274.6)
-
Step 500
500
#7583CF
oklch(63.1% 0.115 274.7)
-
Step 600
600 (this color)
#6573C4
oklch(58.1% 0.125 274.5)
-
Step 700
700
#4E59A2
oklch(49.1% 0.117 274.8)
-
Step 800
800
#404983
oklch(42.7% 0.096 274.9)
-
Step 900
900
#363E69
oklch(37.8% 0.074 274.3)
-
Step 950
950
#1F243E
oklch(26.9% 0.049 274.4)
#6573C4 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) | #537DC7 | 0.031 |
| Deuteranopia (no green cones) | #4B75C2 | 0.031 |
| Tritanopia (no blue cones) | #408492 | 0.111 |
| Achromatopsia (no color) | #797979 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6573C4
#6573C4
oklch(58.1% 0.125 274.5)
- #927900
#927900
oklch(58.3% 0.12 94.4)
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 #6573C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.057
- Cool Blue #4984B8 ΔE 0.060
- French Blue #436BAD ΔE 0.061
- Steel Blue #4682B4 ΔE 0.061
- Slate Blue #6A5ACD ΔE 0.066
- Off Blue #5684AE ΔE 0.066
- Flat Blue #3C73A8 ΔE 0.067
Use #6573C4 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.