#5F73CC
Closest named color: Windows Blue (#3778BF). oklch(58.2% 0.138 272), rgb(95, 115, 204).
Aa
Black text reads best on this color (4.81:1).
About this color
#5F73CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.138 and its hue 272°. 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 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.81:1 |
| White text | 4.36:1 |
Values
| HEX | #5F73CC |
| RGB | rgb(95, 115, 204) |
| HSL | hsl(229, 52%, 59%) |
| OKLCH | oklch(58.2% 0.138 272) |
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 #5F73CC | 4.36:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #5F73CC | 4.81:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #5F73CC text on white | 4.36:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #5F73CC text on black | 4.81:1 | AA | Lc -31.6 | 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
#E5E9F6
oklch(93.5% 0.018 272.3)
-
Step 200
200
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B2BFEA
oklch(80.9% 0.063 271.8)
-
Step 400
400
#8B9DDF
oklch(70.8% 0.099 272)
-
Step 500
500
#6F83D6
oklch(63.1% 0.127 272.1)
-
Step 600
600 (this color)
#5F73CC
oklch(58.2% 0.138 272)
-
Step 700
700
#4859A9
oklch(49.1% 0.129 271.9)
-
Step 800
800
#3B4989
oklch(42.7% 0.107 271.9)
-
Step 900
900
#323E6D
oklch(37.7% 0.082 271.2)
-
Step 950
950
#1D2440
oklch(26.9% 0.053 271.8)
#5F73CC 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) | #4D7ECF | 0.032 |
| Deuteranopia (no green cones) | #4074CA | 0.034 |
| Tritanopia (no blue cones) | #298695 | 0.123 |
| Achromatopsia (no color) | #797979 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F73CC
#5F73CC
oklch(58.2% 0.138 272)
- #947800
#947800
oklch(58.3% 0.119 92.5)
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 #5F73CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.052
- Royal Blue #4169E1 ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.062
- French Blue #436BAD ΔE 0.063
- Light Indigo #6D5ACF ΔE 0.063
- Cool Blue #4984B8 ΔE 0.065
- Steel Blue #4682B4 ΔE 0.066
Use #5F73CC 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.