#4B78CC
Closest named color: Windows Blue (#3778BF). oklch(58.1% 0.139 261.8), rgb(75, 120, 204).
Aa
Black text reads best on this color (4.85:1).
About this color
#4B78CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.139 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.028 away. Black text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.85:1 |
| White text | 4.32:1 |
Values
| HEX | #4B78CC |
| RGB | rgb(75, 120, 204) |
| HSL | hsl(219, 56%, 55%) |
| OKLCH | oklch(58.1% 0.139 261.8) |
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 #4B78CC | 4.32:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #4B78CC | 4.85:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #4B78CC text on white | 4.32:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #4B78CC text on black | 4.85:1 | AA | Lc -32.0 | 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
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#ABC1EA
oklch(80.8% 0.063 262.8)
-
Step 400
400
#7EA1DF
oklch(70.8% 0.099 261.5)
-
Step 500
500
#5D88D6
oklch(63.1% 0.127 261.5)
-
Step 600
600 (this color)
#4B78CC
oklch(58.1% 0.139 261.8)
-
Step 700
700
#365EA9
oklch(49.2% 0.128 261.7)
-
Step 800
800
#2D4D89
oklch(42.8% 0.107 261.8)
-
Step 900
900
#28406D
oklch(37.6% 0.083 262)
-
Step 950
950
#182640
oklch(27% 0.052 262)
#4B78CC 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) | #5280CF | 0.024 |
| Deuteranopia (no green cones) | #3F74CA | 0.017 |
| Tritanopia (no blue cones) | #008B98 | 0.116 |
| Achromatopsia (no color) | #797979 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B78CC
#4B78CC
oklch(58.1% 0.139 261.8)
- #9E7200
#9E7200
oklch(58.1% 0.12 81.6)
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 #4B78CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.028
- Water Blue #0E87CC ΔE 0.049
- Cool Blue #4984B8 ΔE 0.051
- Steel Blue #4682B4 ΔE 0.052
- Royal Blue #4169E1 ΔE 0.056
- French Blue #436BAD ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.059
- Nice Blue #107AB0 ΔE 0.062
Use #4B78CC 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.