#4F73CA
Closest named color: Windows Blue (#3778BF). oklch(57.1% 0.14 265.3), rgb(79, 115, 202).
Aa
Black text reads best on this color (4.63:1).
About this color
#4F73CA is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.140 and its hue 265°. 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 (0.140) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.63:1 |
| White text | 4.52:1 |
Values
| HEX | #4F73CA |
| RGB | rgb(79, 115, 202) |
| HSL | hsl(222, 54%, 55%) |
| OKLCH | oklch(57.1% 0.14 265.3) |
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 #4F73CA | 4.52:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #4F73CA | 4.63:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #4F73CA text on white | 4.52:1 | AA | Lc 71.2 | Content text, not long reading |
| #4F73CA text on black | 4.63:1 | AA | Lc -30.5 | 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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#ADC1EA
oklch(81% 0.062 264.6)
-
Step 400
400
#829FE0
oklch(70.6% 0.101 265.5)
-
Step 500
500
#6386D7
oklch(63% 0.129 265.2)
-
Step 600
600 (this color)
#4F73CA
oklch(57.1% 0.14 265.3)
-
Step 700
700
#3C5CAA
oklch(49.1% 0.13 265.2)
-
Step 800
800
#324B8A
oklch(42.7% 0.109 265.7)
-
Step 900
900
#2C3F6E
oklch(37.6% 0.084 265.9)
-
Step 950
950
#1A2540
oklch(26.9% 0.053 266.2)
#4F73CA 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) | #4C7CCD | 0.024 |
| Deuteranopia (no green cones) | #3A71C8 | 0.023 |
| Tritanopia (no blue cones) | #008795 | 0.121 |
| Achromatopsia (no color) | #767676 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F73CA
#4F73CA
oklch(57.1% 0.14 265.3)
- #977100
#977100
oklch(57.1% 0.117 85.1)
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 #4F73CA, 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 0.049
- French Blue #436BAD ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.059
- Mid Blue #276AB3 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.060
- Cool Blue #4984B8 ΔE 0.060
Use #4F73CA 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.