#4F66E5
Closest named color: Royal Blue (#4169E1). oklch(56.4% 0.193 271.1), rgb(79, 102, 229).
Aa
White text reads best on this color (4.81:1).
About this color
#4F66E5 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.193 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.017 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.36:1 |
| White text | 4.81:1 |
Values
| HEX | #4F66E5 |
| RGB | rgb(79, 102, 229) |
| HSL | hsl(231, 74%, 60%) |
| OKLCH | oklch(56.4% 0.193 271.1) |
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 #4F66E5 | 4.81:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #4F66E5 | 4.36:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #4F66E5 text on white | 4.81:1 | AA | Lc 73.0 | Content text, not long reading |
| #4F66E5 text on black | 4.36:1 | AA large text | Lc -28.7 | 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
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ACBEFA
oklch(80.9% 0.087 271.4)
-
Step 400
400
#819AF7
oklch(70.7% 0.139 271.1)
-
Step 500
500
#647EF3
oklch(63.2% 0.177 271.1)
-
Step 600
600 (this color)
#4F66E5
oklch(56.4% 0.193 271.1)
-
Step 700
700
#3F51C5
oklch(49.1% 0.181 271.4)
-
Step 800
800
#33439F
oklch(42.6% 0.15 271.1)
-
Step 900
900
#2C3A7E
oklch(37.7% 0.116 271.1)
-
Step 950
950
#1A234A
oklch(27.1% 0.073 271.1)
#4F66E5 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) | #0079E9 | 0.058 |
| Deuteranopia (no green cones) | #006BE2 | 0.049 |
| Tritanopia (no blue cones) | #00859C | 0.160 |
| Achromatopsia (no color) | #727272 | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F66E5
#4F66E5
oklch(56.4% 0.193 271.1)
- #8F7200
#8F7200
oklch(56.4% 0.115 91)
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 #4F66E5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.017
- Neon Blue #4361EE ΔE 0.024
- Warm Blue #4B57DB ΔE 0.039
- Dark Periwinkle #665FD1 ΔE 0.043
- Cerulean Blue #056EEE ΔE 0.048
- Azul #1D5DEC ΔE 0.053
- Slate Blue #6A5ACD ΔE 0.055
- Light Indigo #6D5ACF ΔE 0.056
Use #4F66E5 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.