#4F66F3
Closest named color: Neon Blue (#4361EE). oklch(57.5% 0.211 271.1), rgb(79, 102, 243).
Aa
White text reads best on this color (4.63:1).
About this color
#4F66F3 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.211 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.021 away. White text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.211) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.52:1 |
| White text | 4.63:1 |
Values
| HEX | #4F66F3 |
| RGB | rgb(79, 102, 243) |
| HSL | hsl(232, 87%, 63%) |
| OKLCH | oklch(57.5% 0.211 271.1) |
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 #4F66F3 | 4.63:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #4F66F3 | 4.52:1 | AA | Lc 32.4 | Non-text elements, placeholder text |
| #4F66F3 text on white | 4.63:1 | AA | Lc 71.7 | Content text, not long reading |
| #4F66F3 text on black | 4.52:1 | AA | Lc -30.0 | 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
#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
#AABEFF
oklch(81% 0.095 271)
-
Step 400
400
#7E99FF
oklch(70.7% 0.152 270.9)
-
Step 500
500
#617BFD
oklch(63.1% 0.194 271.3)
-
Step 600
600 (this color)
#4F66F3
oklch(57.5% 0.211 271.1)
-
Step 700
700
#3C4ECE
oklch(49.1% 0.197 271)
-
Step 800
800
#3141A6
oklch(42.7% 0.162 270.9)
-
Step 900
900
#2A3884
oklch(37.6% 0.128 271)
-
Step 950
950
#19224D
oklch(27.1% 0.08 271.2)
#4F66F3 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 | 0.061 |
| Deuteranopia (no green cones) | #006DF0 | 0.048 |
| Tritanopia (no blue cones) | #0089A3 | 0.172 |
| Achromatopsia (no color) | #757575 | 0.212 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F66F3
#4F66F3
oklch(57.5% 0.211 271.1)
- #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 #4F66F3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.021
- Royal Blue #4169E1 ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.048
- Warm Blue #4B57DB ΔE 0.050
- Bright Blue #0165FC ΔE 0.051
- Clear Blue #247AFD ΔE 0.053
- Azul #1D5DEC ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.059
Use #4F66F3 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.