#4973CB
Closest named color: Windows Blue (#3778BF). oklch(56.9% 0.144 263.3), rgb(73, 115, 203).
Aa
Black text reads best on this color (4.59:1).
About this color
#4973CB is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.144 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.030 away. Black text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.59:1 |
| White text | 4.56:1 |
Values
| HEX | #4973CB |
| RGB | rgb(73, 115, 203) |
| HSL | hsl(221, 56%, 54%) |
| OKLCH | oklch(56.9% 0.144 263.3) |
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 #4973CB | 4.56:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #4973CB | 4.59:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #4973CB text on white | 4.56:1 | AA | Lc 71.5 | Content text, not long reading |
| #4973CB text on black | 4.59:1 | AA | Lc -30.2 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF2
oklch(88.6% 0.036 262.8)
-
Step 300
300
#ABC1EB
oklch(80.9% 0.064 263.3)
-
Step 400
400
#7FA0E2
oklch(70.7% 0.104 263.6)
-
Step 500
500
#5F87D9
oklch(63.1% 0.132 263.4)
-
Step 600
600 (this color)
#4973CB
oklch(56.9% 0.144 263.3)
-
Step 700
700
#375CAC
oklch(49% 0.135 263.5)
-
Step 800
800
#2E4C8B
oklch(42.7% 0.111 263.3)
-
Step 900
900
#29406F
oklch(37.8% 0.086 263.2)
-
Step 950
950
#182641
oklch(27.1% 0.054 262.5)
#4973CB 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) | #4A7CCE | 0.024 |
| Deuteranopia (no green cones) | #3570C9 | 0.022 |
| Tritanopia (no blue cones) | #008795 | 0.120 |
| Achromatopsia (no color) | #767676 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4973CB
#4973CB
oklch(56.9% 0.144 263.3)
- #987000
#987000
oklch(57% 0.117 83.7)
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 #4973CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.030
- Royal Blue #4169E1 ΔE 0.046
- French Blue #436BAD ΔE 0.050
- Mid Blue #276AB3 ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.058
- Water Blue #0E87CC ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.060
- Steel Blue #4682B4 ΔE 0.061
Use #4973CB 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.