#5B73BD
Closest named color: Windows Blue (#3778BF). oklch(57.1% 0.118 268.9), rgb(91, 115, 189).
Aa
Black text reads best on this color (4.63:1).
About this color
#5B73BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.118 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.037 away. Black text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.63:1 |
| White text | 4.53:1 |
Values
| HEX | #5B73BD |
| RGB | rgb(91, 115, 189) |
| HSL | hsl(225, 43%, 55%) |
| OKLCH | oklch(57.1% 0.118 268.9) |
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 #5B73BD | 4.53:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #5B73BD | 4.63:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #5B73BD text on white | 4.53:1 | AA | Lc 71.4 | Content text, not long reading |
| #5B73BD text on black | 4.63:1 | AA | Lc -30.3 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B2C0E4
oklch(80.9% 0.053 268.5)
-
Step 400
400
#8B9FD6
oklch(70.8% 0.084 268.8)
-
Step 500
500
#6E86CB
oklch(63.1% 0.108 268.6)
-
Step 600
600 (this color)
#5B73BD
oklch(57.1% 0.118 268.9)
-
Step 700
700
#475C9F
oklch(49.1% 0.11 269)
-
Step 800
800
#3B4C81
oklch(42.9% 0.091 268.9)
-
Step 900
900
#323F67
oklch(37.6% 0.071 269.2)
-
Step 950
950
#1D253C
oklch(26.9% 0.045 268.7)
#5B73BD 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) | #567BC0 | 0.021 |
| Deuteranopia (no green cones) | #4B72BB | 0.020 |
| Tritanopia (no blue cones) | #2E838F | 0.106 |
| Achromatopsia (no color) | #767676 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B73BD
#5B73BD
oklch(57.1% 0.118 268.9)
- #937300
#937300
oklch(57.1% 0.117 89.2)
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 #5B73BD, closest first.
No curated palette has a color within ΔE 0.04 of #5B73BD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.037
- French Blue #436BAD ΔE 0.045
- Flat Blue #3C73A8 ΔE 0.049
- Steel Blue #4682B4 ΔE 0.050
- Cool Blue #4984B8 ΔE 0.051
- Off Blue #5684AE ΔE 0.058
- Dull Blue #49759C ΔE 0.059
- Muted Blue #3B719F ΔE 0.061
Use #5B73BD 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.