#4F78DC
Closest named color: Royal Blue (#4169E1). oklch(59.3% 0.159 265.1), rgb(79, 120, 220).
Aa
Black text reads best on this color (5.05:1).
About this color
#4F78DC is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.159 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.044 away. Black text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #4F78DC |
| RGB | rgb(79, 120, 220) |
| HSL | hsl(223, 67%, 59%) |
| OKLCH | oklch(59.3% 0.159 265.1) |
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 #4F78DC | 4.15:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #4F78DC | 5.05:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #4F78DC text on white | 4.15:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #4F78DC text on black | 5.05:1 | AA | Lc -33.3 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCD9F4
oklch(88.4% 0.04 265.1)
-
Step 300
300
#AAC0F0
oklch(80.8% 0.072 265.6)
-
Step 400
400
#7E9FE8
oklch(70.8% 0.114 265.1)
-
Step 500
500
#5E85E1
oklch(63.1% 0.145 265.2)
-
Step 600
600 (this color)
#4F78DC
oklch(59.3% 0.159 265.1)
-
Step 700
700
#375AB4
oklch(49.2% 0.149 265.3)
-
Step 800
800
#2D4A91
oklch(42.7% 0.122 265)
-
Step 900
900
#283F74
oklch(37.8% 0.095 264.6)
-
Step 950
950
#182544
oklch(27% 0.061 265.4)
#4F78DC 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) | #4783E0 | 0.028 |
| Deuteranopia (no green cones) | #2E76DA | 0.030 |
| Tritanopia (no blue cones) | #008F9F | 0.134 |
| Achromatopsia (no color) | #7C7C7C | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F78DC
#4F78DC
oklch(59.3% 0.159 265.1)
- #9F7700
#9F7700
oklch(59.3% 0.121 85)
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 #4F78DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.044
- Windows Blue #3778BF ΔE 0.052
- Cornflower #6A79F7 ΔE 0.053
- Soft Blue #6488EA ΔE 0.053
- Clear Blue #247AFD ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.057
- Water Blue #0E87CC ΔE 0.061
- Cerulean Blue #056EEE ΔE 0.062
Use #4F78DC 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.