#5B73C2
Closest named color: Windows Blue (#3778BF). oklch(57.4% 0.125 269.4), rgb(91, 115, 194).
Aa
Black text reads best on this color (4.67:1).
About this color
#5B73C2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.125 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.038 away. Black text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.67:1 |
| White text | 4.49:1 |
Values
| HEX | #5B73C2 |
| RGB | rgb(91, 115, 194) |
| HSL | hsl(226, 46%, 56%) |
| OKLCH | oklch(57.4% 0.125 269.4) |
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 #5B73C2 | 4.49:1 | AA large text | Lc -76.5 | Fine for body text |
| Black text on #5B73C2 | 4.67:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #5B73C2 text on white | 4.49:1 | AA large text | Lc 71.0 | Content text, not long reading |
| #5B73C2 text on black | 4.67:1 | AA | Lc -30.6 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2C0E6
oklch(81% 0.056 269.2)
-
Step 400
400
#8A9ED9
oklch(70.6% 0.09 269.6)
-
Step 500
500
#6E85CF
oklch(63.1% 0.115 269.8)
-
Step 600
600 (this color)
#5B73C2
oklch(57.4% 0.125 269.4)
-
Step 700
700
#465BA2
oklch(49% 0.116 269.3)
-
Step 800
800
#3A4B84
oklch(42.8% 0.097 269.5)
-
Step 900
900
#323F69
oklch(37.7% 0.074 269.6)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#5B73C2 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) | #537CC5 | 0.024 |
| Deuteranopia (no green cones) | #4773C0 | 0.023 |
| Tritanopia (no blue cones) | #298491 | 0.112 |
| Achromatopsia (no color) | #777777 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B73C2
#5B73C2
oklch(57.4% 0.125 269.4)
- #947400
#947400
oklch(57.4% 0.117 89.4)
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 #5B73C2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.038
- French Blue #436BAD ΔE 0.049
- Steel Blue #4682B4 ΔE 0.054
- Cool Blue #4984B8 ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.059
- Off Blue #5684AE ΔE 0.063
- Mid Blue #276AB3 ΔE 0.065
Use #5B73C2 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.