#4B66E4
Closest named color: Royal Blue (#4169E1). oklch(56.1% 0.193 269.9), rgb(75, 102, 228).
Aa
White text reads best on this color (4.86:1).
About this color
#4B66E4 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.193 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.013 away. White text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.32:1 |
| White text | 4.86:1 |
Values
| HEX | #4B66E4 |
| RGB | rgb(75, 102, 228) |
| HSL | hsl(229, 74%, 59%) |
| OKLCH | oklch(56.1% 0.193 269.9) |
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 #4B66E4 | 4.86:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #4B66E4 | 4.32:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #4B66E4 text on white | 4.86:1 | AA | Lc 73.3 | Content text, not long reading |
| #4B66E4 text on black | 4.32:1 | AA large text | Lc -28.4 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD8FA
oklch(88.4% 0.049 270)
-
Step 300
300
#AABEFA
oklch(80.8% 0.088 270.1)
-
Step 400
400
#7F9BF7
oklch(70.8% 0.139 269.8)
-
Step 500
500
#617EF3
oklch(63% 0.177 270.2)
-
Step 600
600 (this color)
#4B66E4
oklch(56.1% 0.193 269.9)
-
Step 700
700
#3C52C5
oklch(49.1% 0.18 270.1)
-
Step 800
800
#31449F
oklch(42.7% 0.149 270)
-
Step 900
900
#2A3B7E
oklch(37.8% 0.115 269.5)
-
Step 950
950
#19234A
oklch(27.1% 0.073 270.1)
#4B66E4 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) | #0078E8 | 0.054 |
| Deuteranopia (no green cones) | #006BE1 | 0.045 |
| Tritanopia (no blue cones) | #00859B | 0.159 |
| Achromatopsia (no color) | #717171 | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B66E4
#4B66E4
oklch(56.1% 0.193 269.9)
- #8F7100
#8F7100
oklch(56.2% 0.115 90.2)
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 #4B66E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.013
- Neon Blue #4361EE ΔE 0.022
- Warm Blue #4B57DB ΔE 0.037
- Cerulean Blue #056EEE ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.045
- Azul #1D5DEC ΔE 0.049
- Bright Blue #0165FC ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.057
Use #4B66E4 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.