#6573B7
Closest named color: Windows Blue (#3778BF). oklch(57.4% 0.106 273.8), rgb(101, 115, 183).
Aa
Black text reads best on this color (4.68:1).
About this color
#6573B7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.106 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 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.68:1 |
| White text | 4.47:1 |
Values
| HEX | #6573B7 |
| RGB | rgb(101, 115, 183) |
| HSL | hsl(230, 36%, 56%) |
| OKLCH | oklch(57.4% 0.106 273.8) |
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 #6573B7 | 4.47:1 | AA large text | Lc -76.5 | Fine for body text |
| Black text on #6573B7 | 4.68:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #6573B7 text on white | 4.47:1 | AA large text | Lc 71.0 | Content text, not long reading |
| #6573B7 text on black | 4.68:1 | AA | Lc -30.7 | 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
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D3D8EB
oklch(88.4% 0.027 274.1)
-
Step 300
300
#B6BFE0
oklch(80.8% 0.048 273.3)
-
Step 400
400
#919ED1
oklch(70.8% 0.076 273.2)
-
Step 500
500
#7785C5
oklch(63.2% 0.098 273.9)
-
Step 600
600 (this color)
#6573B7
oklch(57.4% 0.106 273.8)
-
Step 700
700
#4F5B98
oklch(49% 0.099 273.8)
-
Step 800
800
#414B7C
oklch(42.8% 0.082 273.7)
-
Step 900
900
#373F63
oklch(37.7% 0.063 273.5)
-
Step 950
950
#20253A
oklch(27% 0.04 273.2)
#6573B7 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) | #5A7BBA | 0.024 |
| Deuteranopia (no green cones) | #5374B5 | 0.023 |
| Tritanopia (no blue cones) | #48818C | 0.095 |
| Achromatopsia (no color) | #777777 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6573B7
#6573B7
oklch(57.4% 0.106 273.8)
- #8D771F
#8D771F
oklch(57.4% 0.106 94.3)
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 #6573B7, closest first.
No curated palette has a color within ΔE 0.04 of #6573B7.
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 0.052
- Steel Blue #4682B4 ΔE 0.052
- Cool Blue #4984B8 ΔE 0.053
- Flat Blue #3C73A8 ΔE 0.054
- Off Blue #5684AE ΔE 0.055
- Dull Blue #49759C ΔE 0.058
- Stormy Blue #507B9C ΔE 0.059
Use #6573B7 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.