#5C73BB
Closest named color: Windows Blue (#3778BF). oklch(57% 0.115 269.2), rgb(92, 115, 187).
Aa
Black text reads best on this color (4.62:1).
About this color
#5C73BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.115 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 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.62:1 |
| White text | 4.54:1 |
Values
| HEX | #5C73BB |
| RGB | rgb(92, 115, 187) |
| HSL | hsl(225, 41%, 55%) |
| OKLCH | oklch(57% 0.115 269.2) |
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 #5C73BB | 4.54:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #5C73BB | 4.62:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #5C73BB text on white | 4.54:1 | AA | Lc 71.4 | Content text, not long reading |
| #5C73BB text on black | 4.62:1 | 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
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B3C0E3
oklch(80.9% 0.052 269.2)
-
Step 400
400
#8B9FD5
oklch(70.7% 0.083 268.6)
-
Step 500
500
#6F86CA
oklch(63.1% 0.106 269)
-
Step 600
600 (this color)
#5C73BB
oklch(57% 0.115 269.2)
-
Step 700
700
#485C9D
oklch(49% 0.107 269.3)
-
Step 800
800
#3B4C7F
oklch(42.7% 0.088 268.6)
-
Step 900
900
#333F66
oklch(37.6% 0.069 269.9)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#5C73BB 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) | #577BBE | 0.021 |
| Deuteranopia (no green cones) | #4D72B9 | 0.019 |
| Tritanopia (no blue cones) | #32828E | 0.102 |
| Achromatopsia (no color) | #767676 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5C73BB
#5C73BB
oklch(57% 0.115 269.2)
- #927307
#927307
oklch(57% 0.115 89.5)
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 #5C73BB, 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 0.044
- Flat Blue #3C73A8 ΔE 0.048
- Steel Blue #4682B4 ΔE 0.049
- Cool Blue #4984B8 ΔE 0.051
- Off Blue #5684AE ΔE 0.057
- Dull Blue #49759C ΔE 0.057
- Muted Blue #3B719F ΔE 0.060
Use #5C73BB 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.