#4C73CC
Closest named color: Windows Blue (#3778BF). oklch(57.1% 0.144 264.5), rgb(76, 115, 204).
Aa
Black text reads best on this color (4.63:1).
About this color
#4C73CC is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.144 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.032 away. Black text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.63:1 |
| White text | 4.53:1 |
Values
| HEX | #4C73CC |
| RGB | rgb(76, 115, 204) |
| HSL | hsl(222, 56%, 55%) |
| OKLCH | oklch(57.1% 0.144 264.5) |
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 #4C73CC | 4.53:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #4C73CC | 4.63:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #4C73CC text on white | 4.53:1 | AA | Lc 71.2 | Content text, not long reading |
| #4C73CC text on black | 4.63:1 | AA | Lc -30.4 | 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
#F2F5FB
oklch(97% 0.009 264.5)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CDD9F2
oklch(88.4% 0.037 265.1)
-
Step 300
300
#ACC1EC
oklch(81% 0.065 264.5)
-
Step 400
400
#80A0E2
oklch(70.8% 0.104 264.1)
-
Step 500
500
#6186D9
oklch(63% 0.132 264.7)
-
Step 600
600 (this color)
#4C73CC
oklch(57.1% 0.144 264.5)
-
Step 700
700
#395CAC
oklch(49.1% 0.134 264.3)
-
Step 800
800
#304B8B
oklch(42.6% 0.111 264.9)
-
Step 900
900
#2A3F6F
oklch(37.6% 0.087 264.8)
-
Step 950
950
#192541
oklch(26.9% 0.055 265.3)
#4C73CC 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) | #4A7CCF | 0.024 |
| Deuteranopia (no green cones) | #3671CA | 0.023 |
| Tritanopia (no blue cones) | #008795 | 0.122 |
| Achromatopsia (no color) | #767676 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4C73CC
#4C73CC
oklch(57.1% 0.144 264.5)
- #987100
#987100
oklch(57.2% 0.117 84.5)
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 #4C73CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.032
- Royal Blue #4169E1 ΔE 0.046
- French Blue #436BAD ΔE 0.052
- Dark Periwinkle #665FD1 ΔE 0.058
- Mid Blue #276AB3 ΔE 0.059
- Flat Blue #3C73A8 ΔE 0.060
- Water Blue #0E87CC ΔE 0.060
- Steel Blue #4682B4 ΔE 0.062
Use #4C73CC 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.