#4E78D3
Closest named color: Windows Blue (#3778BF). oklch(58.7% 0.147 263.8), rgb(78, 120, 211).
Aa
Black text reads best on this color (4.95:1).
About this color
#4E78D3 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.147 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.039 away. Black text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.95:1 |
| White text | 4.24:1 |
Values
| HEX | #4E78D3 |
| RGB | rgb(78, 120, 211) |
| HSL | hsl(221, 60%, 57%) |
| OKLCH | oklch(58.7% 0.147 263.8) |
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 #4E78D3 | 4.24:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #4E78D3 | 4.95:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #4E78D3 text on white | 4.24:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #4E78D3 text on black | 4.95:1 | AA | Lc -32.6 | 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
#CDDAF2
oklch(88.6% 0.036 262.8)
-
Step 300
300
#ABC1EC
oklch(80.9% 0.066 263.7)
-
Step 400
400
#7FA0E3
oklch(70.8% 0.105 263.8)
-
Step 500
500
#5E86DB
oklch(63% 0.136 263.9)
-
Step 600
600 (this color)
#4E78D3
oklch(58.7% 0.147 263.8)
-
Step 700
700
#375CAD
oklch(49.1% 0.136 263.7)
-
Step 800
800
#2E4B8C
oklch(42.6% 0.113 264.1)
-
Step 900
900
#293F70
oklch(37.6% 0.089 264.3)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#4E78D3 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) | #4E81D6 | 0.024 |
| Deuteranopia (no green cones) | #3975D1 | 0.023 |
| Tritanopia (no blue cones) | #008D9B | 0.125 |
| Achromatopsia (no color) | #7B7B7B | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4E78D3
#4E78D3
oklch(58.7% 0.147 263.8)
- #9E7500
#9E7500
oklch(58.7% 0.121 84)
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 #4E78D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.039
- Royal Blue #4169E1 ΔE 0.050
- Water Blue #0E87CC ΔE 0.054
- Cool Blue #4984B8 ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.059
- Soft Blue #6488EA ΔE 0.060
- Steel Blue #4682B4 ΔE 0.061
- Cornflower #6A79F7 ΔE 0.065
Use #4E78D3 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.