#4E73B0
Closest named color: Flat Blue (#3C73A8). oklch(55.6% 0.104 260), rgb(78, 115, 176).
Aa
White text reads best on this color (4.76:1).
About this color
#4E73B0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.104 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.023 away. White text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.40:1 |
| White text | 4.76:1 |
Values
| HEX | #4E73B0 |
| RGB | rgb(78, 115, 176) |
| HSL | hsl(217, 39%, 50%) |
| OKLCH | oklch(55.6% 0.104 260) |
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 #4E73B0 | 4.76:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #4E73B0 | 4.40:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #4E73B0 text on white | 4.76:1 | AA | Lc 73.0 | Content text, not long reading |
| #4E73B0 text on black | 4.40:1 | AA large text | Lc -28.7 | Dividers and decoration only |
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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC2E0
oklch(80.9% 0.047 259.5)
-
Step 400
400
#85A2D0
oklch(70.7% 0.075 259.5)
-
Step 500
500
#678AC4
oklch(63.1% 0.097 260.2)
-
Step 600
600 (this color)
#4E73B0
oklch(55.6% 0.104 260)
-
Step 700
700
#3F6097
oklch(49% 0.097 260.1)
-
Step 800
800
#344F7B
oklch(42.7% 0.081 259.8)
-
Step 900
900
#2E4263
oklch(37.8% 0.062 260.1)
-
Step 950
950
#1B273A
oklch(27.1% 0.039 259.4)
#4E73B0 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) | #5A78B3 | 0.021 |
| Deuteranopia (no green cones) | #4E6EAF | 0.014 |
| Tritanopia (no blue cones) | #0F8089 | 0.093 |
| Achromatopsia (no color) | #737373 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4E73B0
#4E73B0
oklch(55.6% 0.104 260)
- #936B1C
#936B1C
oklch(55.5% 0.104 79.6)
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 #4E73B0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.023
- French Blue #436BAD ΔE 0.027
- Windows Blue #3778BF ΔE 0.030
- Dull Blue #49759C ΔE 0.035
- Muted Blue #3B719F ΔE 0.035
- Steel Blue #4682B4 ΔE 0.041
- Cerulean #457B9D ΔE 0.044
- Nice Blue #107AB0 ΔE 0.044
Use #4E73B0 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.