#4C66C4
Closest named color: French Blue (#436BAD). oklch(53.9% 0.149 269.3), rgb(76, 102, 196).
Aa
White text reads best on this color (5.24:1).
About this color
#4C66C4 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.149 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.042 away. White text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #4C66C4 |
| RGB | rgb(76, 102, 196) |
| HSL | hsl(227, 50%, 53%) |
| OKLCH | oklch(53.9% 0.149 269.3) |
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 #4C66C4 | 5.24:1 | AA | Lc -81.1 | Fine for body text |
| Black text on #4C66C4 | 4.00:1 | AA large text | Lc 28.3 | Dividers and decoration only |
| #4C66C4 text on white | 5.24:1 | AA | Lc 75.8 | Fine for body text |
| #4C66C4 text on black | 4.00:1 | AA large text | Lc -26.0 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CFD9F3
oklch(88.6% 0.037 268.9)
-
Step 300
300
#AFBFED
oklch(80.8% 0.068 269.9)
-
Step 400
400
#859DE4
oklch(70.6% 0.108 269.3)
-
Step 500
500
#6883DC
oklch(63% 0.138 269.4)
-
Step 600
600 (this color)
#4C66C4
oklch(53.9% 0.149 269.3)
-
Step 700
700
#4259AE
oklch(49.1% 0.138 269.4)
-
Step 800
800
#36498D
oklch(42.7% 0.115 269.3)
-
Step 900
900
#2F3E71
oklch(37.8% 0.089 269.4)
-
Step 950
950
#1B2442
oklch(26.9% 0.057 269.6)
#4C66C4 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) | #3772C7 | 0.034 |
| Deuteranopia (no green cones) | #2167C2 | 0.038 |
| Tritanopia (no blue cones) | #007B8B | 0.128 |
| Achromatopsia (no color) | #6C6C6C | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4C66C4
#4C66C4
oklch(53.9% 0.149 269.3)
- #886A00
#886A00
oklch(53.9% 0.11 89.1)
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 #4C66C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.042
- Iris #6258C4 ΔE 0.043
- Dark Periwinkle #665FD1 ΔE 0.043
- Royal Blue #4169E1 ΔE 0.045
- Mid Blue #276AB3 ΔE 0.046
- Slate Blue #6A5ACD ΔE 0.051
- Windows Blue #3778BF ΔE 0.052
- Warm Blue #4B57DB ΔE 0.053
Use #4C66C4 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.