#4573CF
Closest named color: Windows Blue (#3778BF). oklch(57% 0.151 262.6), rgb(69, 115, 207).
Aa
Black text reads best on this color (4.60:1).
About this color
#4573CF is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.151 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.033 away. Black text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.60:1 |
| White text | 4.55:1 |
Values
| HEX | #4573CF |
| RGB | rgb(69, 115, 207) |
| HSL | hsl(220, 59%, 54%) |
| OKLCH | oklch(57% 0.151 262.6) |
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 #4573CF | 4.55:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #4573CF | 4.60:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #4573CF text on white | 4.55:1 | AA | Lc 71.4 | Content text, not long reading |
| #4573CF text on black | 4.60:1 | AA | Lc -30.3 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1ED
oklch(80.8% 0.068 262.5)
-
Step 400
400
#7CA0E5
oklch(70.7% 0.109 262.8)
-
Step 500
500
#5B87DD
oklch(63.1% 0.139 262.6)
-
Step 600
600 (this color)
#4573CF
oklch(57% 0.151 262.6)
-
Step 700
700
#335CAF
oklch(49% 0.14 262.6)
-
Step 800
800
#2B4C8E
oklch(42.8% 0.116 262.6)
-
Step 900
900
#274071
oklch(37.8% 0.09 262.5)
-
Step 950
950
#172642
oklch(27.1% 0.056 262)
#4573CF 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) | #467DD2 | 0.027 |
| Deuteranopia (no green cones) | #2E70CD | 0.023 |
| Tritanopia (no blue cones) | #008897 | 0.123 |
| Achromatopsia (no color) | #767676 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4573CF
#4573CF
oklch(57% 0.151 262.6)
- #996F00
#996F00
oklch(56.9% 0.117 82.2)
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 #4573CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.033
- Royal Blue #4169E1 ΔE 0.040
- French Blue #436BAD ΔE 0.054
- Mid Blue #276AB3 ΔE 0.057
- Water Blue #0E87CC ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.063
Use #4573CF 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.