#4B66F1
Closest named color: Neon Blue (#4361EE). oklch(57.1% 0.21 270), rgb(75, 102, 241).
Aa
White text reads best on this color (4.69:1).
About this color
#4B66F1 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.210 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.016 away. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.210) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.46:1 |
| White text | 4.69:1 |
Values
| HEX | #4B66F1 |
| RGB | rgb(75, 102, 241) |
| HSL | hsl(230, 86%, 62%) |
| OKLCH | oklch(57.1% 0.21 270) |
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 #4B66F1 | 4.69:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #4B66F1 | 4.46:1 | AA large text | Lc 32.0 | Non-text elements, placeholder text |
| #4B66F1 text on white | 4.69:1 | AA | Lc 72.1 | Content text, not long reading |
| #4B66F1 text on black | 4.46:1 | AA large text | Lc -29.6 | 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
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CBD8FD
oklch(88.4% 0.053 270)
-
Step 300
300
#A9BEFE
oklch(80.9% 0.094 270.2)
-
Step 400
400
#7C99FE
oklch(70.6% 0.151 270.1)
-
Step 500
500
#5E7CFC
oklch(63% 0.193 270.1)
-
Step 600
600 (this color)
#4B66F1
oklch(57.1% 0.21 270)
-
Step 700
700
#394FCD
oklch(49.1% 0.195 269.9)
-
Step 800
800
#2F42A6
oklch(42.8% 0.162 269.9)
-
Step 900
900
#293983
oklch(37.7% 0.126 270.1)
-
Step 950
950
#18224D
oklch(27% 0.08 270.4)
#4B66F1 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) | #007BF6 | 0.057 |
| Deuteranopia (no green cones) | #006CEE | 0.044 |
| Tritanopia (no blue cones) | #0088A2 | 0.168 |
| Achromatopsia (no color) | #747474 | 0.210 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B66F1
#4B66F1
oklch(57.1% 0.21 270)
- #927400
#927400
oklch(57.2% 0.117 90.6)
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 #4B66F1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.016
- Royal Blue #4169E1 ΔE 0.028
- Cerulean Blue #056EEE ΔE 0.043
- Bright Blue #0165FC ΔE 0.047
- Warm Blue #4B57DB ΔE 0.047
- Azul #1D5DEC ΔE 0.048
- Clear Blue #247AFD ΔE 0.052
- Dark Periwinkle #665FD1 ΔE 0.059
Use #4B66F1 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.