#4F73CD
Closest named color: Windows Blue (#3778BF). oklch(57.3% 0.145 265.7), rgb(79, 115, 205).
Aa
Black text reads best on this color (4.66:1).
About this color
#4F73CD is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.145 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.035 away. Black text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #4F73CD |
| RGB | rgb(79, 115, 205) |
| HSL | hsl(223, 56%, 56%) |
| OKLCH | oklch(57.3% 0.145 265.7) |
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 #4F73CD | 4.50:1 | AA | Lc -76.5 | Fine for body text |
| Black text on #4F73CD | 4.66:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #4F73CD text on white | 4.50:1 | AA | Lc 71.0 | Content text, not long reading |
| #4F73CD text on black | 4.66:1 | AA | Lc -30.7 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ADC0EC
oklch(80.8% 0.066 266.6)
-
Step 400
400
#829FE2
oklch(70.7% 0.104 265.9)
-
Step 500
500
#6386DA
oklch(63.2% 0.133 265.7)
-
Step 600
600 (this color)
#4F73CD
oklch(57.3% 0.145 265.7)
-
Step 700
700
#3C5BAC
oklch(49.1% 0.134 265.9)
-
Step 800
800
#314B8B
oklch(42.7% 0.111 265.4)
-
Step 900
900
#2B3F6F
oklch(37.6% 0.086 265.4)
-
Step 950
950
#192541
oklch(26.9% 0.055 265.3)
#4F73CD 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) | #497DD0 | 0.026 |
| Deuteranopia (no green cones) | #3671CB | 0.026 |
| Tritanopia (no blue cones) | #008796 | 0.123 |
| Achromatopsia (no color) | #777777 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F73CD
#4F73CD
oklch(57.3% 0.145 265.7)
- #977200
#977200
oklch(57.3% 0.117 85.9)
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 #4F73CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.035
- Royal Blue #4169E1 ΔE 0.046
- French Blue #436BAD ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.056
- Mid Blue #276AB3 ΔE 0.062
- Water Blue #0E87CC ΔE 0.062
- Cool Blue #4984B8 ΔE 0.063
- Flat Blue #3C73A8 ΔE 0.063
Use #4F73CD 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.