#4F66DC
Closest named color: Royal Blue (#4169E1). oklch(55.7% 0.181 271), rgb(79, 102, 220).
Aa
White text reads best on this color (4.92:1).
About this color
#4F66DC is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.181 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 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #4F66DC |
| RGB | rgb(79, 102, 220) |
| HSL | hsl(230, 67%, 59%) |
| OKLCH | oklch(55.7% 0.181 271) |
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 #4F66DC | 4.92:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #4F66DC | 4.26:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #4F66DC text on white | 4.92:1 | AA | Lc 73.7 | Content text, not long reading |
| #4F66DC text on black | 4.26:1 | AA large text | Lc -28.0 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ADBEF6
oklch(80.8% 0.082 271.4)
-
Step 400
400
#839BF2
oklch(70.8% 0.13 271.1)
-
Step 500
500
#657FED
oklch(63% 0.167 270.9)
-
Step 600
600 (this color)
#4F66DC
oklch(55.7% 0.181 271)
-
Step 700
700
#4053BE
oklch(49% 0.168 271.2)
-
Step 800
800
#35459A
oklch(42.7% 0.139 271.3)
-
Step 900
900
#2D3B7B
oklch(37.7% 0.11 271)
-
Step 950
950
#1A2348
oklch(27% 0.07 270.8)
#4F66DC 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) | #1077E0 | 0.054 |
| Deuteranopia (no green cones) | #006ADA | 0.050 |
| Tritanopia (no blue cones) | #008297 | 0.152 |
| Achromatopsia (no color) | #707070 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F66DC
#4F66DC
oklch(55.7% 0.181 271)
- #8D7000
#8D7000
oklch(55.8% 0.114 90.7)
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 #4F66DC, 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 0.034
- Dark Periwinkle #665FD1 ΔE 0.036
- Warm Blue #4B57DB ΔE 0.036
- Slate Blue #6A5ACD ΔE 0.048
- Light Indigo #6D5ACF ΔE 0.050
- Iris #6258C4 ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.053
Use #4F66DC 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.