#4578CF
Closest named color: Windows Blue (#3778BF). oklch(58% 0.145 260.4), rgb(69, 120, 207).
Aa
Black text reads best on this color (4.84:1).
About this color
#4578CF is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.145 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.029 away. Black text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.84:1 |
| White text | 4.33:1 |
Values
| HEX | #4578CF |
| RGB | rgb(69, 120, 207) |
| HSL | hsl(218, 59%, 54%) |
| OKLCH | oklch(58% 0.145 260.4) |
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 #4578CF | 4.33:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #4578CF | 4.84:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #4578CF text on white | 4.33:1 | AA large text | Lc 69.8 | Content text, not long reading |
| #4578CF text on black | 4.84:1 | AA | Lc -31.9 | 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
#CCDAF2
oklch(88.5% 0.036 261.3)
-
Step 300
300
#A9C2EB
oklch(80.9% 0.064 260.3)
-
Step 400
400
#7BA1E2
oklch(70.7% 0.105 260.8)
-
Step 500
500
#5988D9
oklch(63% 0.133 260.7)
-
Step 600
600 (this color)
#4578CF
oklch(58% 0.145 260.4)
-
Step 700
700
#305EAC
oklch(49.1% 0.135 260.3)
-
Step 800
800
#294D8B
oklch(42.7% 0.111 260.5)
-
Step 900
900
#25416F
oklch(37.8% 0.086 259.8)
-
Step 950
950
#162641
oklch(27% 0.055 260.3)
#4578CF 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) | #4F80D2 | 0.025 |
| Deuteranopia (no green cones) | #3973CD | 0.019 |
| Tritanopia (no blue cones) | #008C99 | 0.118 |
| Achromatopsia (no color) | #797979 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4578CF
#4578CF
oklch(58% 0.145 260.4)
- #9F7100
#9F7100
oklch(58% 0.12 80.3)
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 #4578CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.029
- Water Blue #0E87CC ΔE 0.048
- Royal Blue #4169E1 ΔE 0.051
- Cool Blue #4984B8 ΔE 0.054
- Steel Blue #4682B4 ΔE 0.055
- French Blue #436BAD ΔE 0.059
- Nice Blue #107AB0 ΔE 0.062
- Flat Blue #3C73A8 ΔE 0.062
Use #4578CF 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.