#4B66CC
Closest named color: Royal Blue (#4169E1). oklch(54.4% 0.161 269.3), rgb(75, 102, 204).
Aa
White text reads best on this color (5.15:1).
About this color
#4B66CC is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.161 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.033 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.161) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #4B66CC |
| RGB | rgb(75, 102, 204) |
| HSL | hsl(227, 56%, 55%) |
| OKLCH | oklch(54.4% 0.161 269.3) |
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 #4B66CC | 5.15:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #4B66CC | 4.07:1 | AA large text | Lc 28.9 | Dividers and decoration only |
| #4B66CC text on white | 5.15:1 | AA | Lc 75.2 | Fine for body text |
| #4B66CC text on black | 4.07:1 | AA large text | Lc -26.5 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F5
oklch(88.6% 0.04 268.5)
-
Step 300
300
#AEBFF0
oklch(80.9% 0.072 269.8)
-
Step 400
400
#839DE9
oklch(70.7% 0.116 268.9)
-
Step 500
500
#6682E2
oklch(63% 0.148 269.6)
-
Step 600
600 (this color)
#4B66CC
oklch(54.4% 0.161 269.3)
-
Step 700
700
#3F58B4
oklch(49.2% 0.149 268.9)
-
Step 800
800
#344892
oklch(42.7% 0.124 269.2)
-
Step 900
900
#2D3D74
oklch(37.6% 0.096 269.2)
-
Step 950
950
#1A2444
oklch(26.9% 0.061 268.9)
#4B66CC 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) | #2E73D0 | 0.038 |
| Deuteranopia (no green cones) | #0868CA | 0.045 |
| Tritanopia (no blue cones) | #007E8F | 0.137 |
| Achromatopsia (no color) | #6D6D6D | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B66CC
#4B66CC
oklch(54.4% 0.161 269.3)
- #896B00
#896B00
oklch(54.2% 0.111 89.2)
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 #4B66CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.033
- Dark Periwinkle #665FD1 ΔE 0.039
- Iris #6258C4 ΔE 0.043
- Warm Blue #4B57DB ΔE 0.044
- Slate Blue #6A5ACD ΔE 0.048
- Light Indigo #6D5ACF ΔE 0.052
- French Blue #436BAD ΔE 0.054
- Mid Blue #276AB3 ΔE 0.054
Use #4B66CC 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.