#4F66DF
Closest named color: Royal Blue (#4169E1). oklch(56% 0.185 271.1), rgb(79, 102, 223).
Aa
White text reads best on this color (4.88:1).
About this color
#4F66DF is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.185 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.016 away. White text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.29:1 |
| White text | 4.88:1 |
Values
| HEX | #4F66DF |
| RGB | rgb(79, 102, 223) |
| HSL | hsl(230, 69%, 59%) |
| OKLCH | oklch(56% 0.185 271.1) |
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 #4F66DF | 4.88:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #4F66DF | 4.29:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #4F66DF text on white | 4.88:1 | AA | Lc 73.5 | Content text, not long reading |
| #4F66DF text on black | 4.29:1 | AA large text | Lc -28.2 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8F9
oklch(88.5% 0.047 272.1)
-
Step 300
300
#ADBEF7
oklch(80.9% 0.083 271.6)
-
Step 400
400
#829BF4
oklch(70.8% 0.133 270.8)
-
Step 500
500
#657FEF
oklch(63.2% 0.17 271)
-
Step 600
600 (this color)
#4F66DF
oklch(56% 0.185 271.1)
-
Step 700
700
#4053C1
oklch(49.2% 0.173 271.2)
-
Step 800
800
#34459C
oklch(42.8% 0.142 270.8)
-
Step 900
900
#2D3B7C
oklch(37.8% 0.111 271)
-
Step 950
950
#1A2348
oklch(27% 0.07 270.8)
#4F66DF 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) | #0278E3 | 0.057 |
| Deuteranopia (no green cones) | #006BDD | 0.049 |
| Tritanopia (no blue cones) | #008399 | 0.154 |
| Achromatopsia (no color) | #717171 | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F66DF
#4F66DF
oklch(56% 0.185 271.1)
- #8D7100
#8D7100
oklch(56% 0.114 91.5)
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 #4F66DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.016
- Neon Blue #4361EE ΔE 0.030
- Warm Blue #4B57DB ΔE 0.037
- Dark Periwinkle #665FD1 ΔE 0.038
- Slate Blue #6A5ACD ΔE 0.050
- Cerulean Blue #056EEE ΔE 0.051
- Light Indigo #6D5ACF ΔE 0.051
- Iris #6258C4 ΔE 0.055
Use #4F66DF 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.