#4D66F3
Closest named color: Neon Blue (#4361EE). oklch(57.4% 0.212 270.6), rgb(77, 102, 243).
Aa
White text reads best on this color (4.65:1).
About this color
#4D66F3 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.212 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.019 away. White text reads best on it, at 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.212) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.51:1 |
| White text | 4.65:1 |
Values
| HEX | #4D66F3 |
| RGB | rgb(77, 102, 243) |
| HSL | hsl(231, 87%, 63%) |
| OKLCH | oklch(57.4% 0.212 270.6) |
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 #4D66F3 | 4.65:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #4D66F3 | 4.51:1 | AA | Lc 32.3 | Non-text elements, placeholder text |
| #4D66F3 text on white | 4.65:1 | AA | Lc 71.8 | Content text, not long reading |
| #4D66F3 text on black | 4.51:1 | AA | Lc -29.9 | 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
#CCD8FD
oklch(88.5% 0.053 271.1)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5F7BFD
oklch(63% 0.195 270.7)
-
Step 600
600 (this color)
#4D66F3
oklch(57.4% 0.212 270.6)
-
Step 700
700
#3B4ECE
oklch(49.1% 0.197 270.7)
-
Step 800
800
#3041A6
oklch(42.6% 0.163 270.5)
-
Step 900
900
#2A3984
oklch(37.8% 0.127 270.6)
-
Step 950
950
#18224D
oklch(27% 0.08 270.4)
#4D66F3 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) | #007CF8 | 0.060 |
| Deuteranopia (no green cones) | #006DF0 | 0.046 |
| Tritanopia (no blue cones) | #0089A3 | 0.171 |
| Achromatopsia (no color) | #747474 | 0.213 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4D66F3
#4D66F3
oklch(57.4% 0.212 270.6)
- #937500
#937500
oklch(57.5% 0.118 90.8)
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 #4D66F3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.019
- Royal Blue #4169E1 ΔE 0.031
- Cerulean Blue #056EEE ΔE 0.046
- Bright Blue #0165FC ΔE 0.049
- Warm Blue #4B57DB ΔE 0.050
- Azul #1D5DEC ΔE 0.051
- Clear Blue #247AFD ΔE 0.052
- Dark Periwinkle #665FD1 ΔE 0.061
Use #4D66F3 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.