#6573BB
Closest named color: Windows Blue (#3778BF). oklch(57.6% 0.112 274), rgb(101, 115, 187).
Aa
Black text reads best on this color (4.72:1).
About this color
#6573BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.112 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.049 away. Black text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.72:1 |
| White text | 4.44:1 |
Values
| HEX | #6573BB |
| RGB | rgb(101, 115, 187) |
| HSL | hsl(230, 39%, 56%) |
| OKLCH | oklch(57.6% 0.112 274) |
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 #6573BB | 4.44:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #6573BB | 4.72:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #6573BB text on white | 4.44:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #6573BB text on black | 4.72:1 | AA | Lc -30.9 | 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 600.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D3D8EC
oklch(88.4% 0.028 274.6)
-
Step 300
300
#B6BFE2
oklch(80.9% 0.05 273.9)
-
Step 400
400
#919DD3
oklch(70.7% 0.08 274.5)
-
Step 500
500
#7684C8
oklch(63% 0.104 274.2)
-
Step 600
600 (this color)
#6573BB
oklch(57.6% 0.112 274)
-
Step 700
700
#4F5B9B
oklch(49.1% 0.103 274)
-
Step 800
800
#414A7E
oklch(42.7% 0.087 274.7)
-
Step 900
900
#373E65
oklch(37.6% 0.067 275)
-
Step 950
950
#20253B
oklch(27.1% 0.042 273.5)
#6573BB 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) | #587BBE | 0.025 |
| Deuteranopia (no green cones) | #5174B9 | 0.025 |
| Tritanopia (no blue cones) | #46828E | 0.100 |
| Achromatopsia (no color) | #787878 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6573BB
#6573BB
oklch(57.6% 0.112 274)
- #8F7714
#8F7714
oklch(57.6% 0.112 93.9)
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 #6573BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.049
- French Blue #436BAD ΔE 0.054
- Steel Blue #4682B4 ΔE 0.054
- Cool Blue #4984B8 ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.058
- Off Blue #5684AE ΔE 0.058
- Dull Blue #49759C ΔE 0.063
- Dusty Blue #5A86AD ΔE 0.063
Use #6573BB 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.