#4666DC
Closest named color: Royal Blue (#4169E1). oklch(55.3% 0.184 268.3), rgb(70, 102, 220).
Aa
White text reads best on this color (5.00:1).
About this color
#4666DC is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.184 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.011 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.184) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #4666DC |
| RGB | rgb(70, 102, 220) |
| HSL | hsl(227, 68%, 57%) |
| OKLCH | oklch(55.3% 0.184 268.3) |
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 #4666DC | 5.00:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #4666DC | 4.19:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #4666DC text on white | 5.00:1 | AA | Lc 74.2 | Content text, not long reading |
| #4666DC text on black | 4.19:1 | AA large text | Lc -27.5 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#AABFF7
oklch(80.9% 0.083 268.6)
-
Step 400
400
#7E9CF3
oklch(70.7% 0.132 268.5)
-
Step 500
500
#5F81EF
oklch(63.2% 0.169 268.4)
-
Step 600
600 (this color)
#4666DC
oklch(55.3% 0.184 268.3)
-
Step 700
700
#3955C0
oklch(49.1% 0.171 268.3)
-
Step 800
800
#2F469B
oklch(42.7% 0.141 268.4)
-
Step 900
900
#293C7B
oklch(37.7% 0.11 268.2)
-
Step 950
950
#182448
oklch(27.1% 0.069 267.8)
#4666DC 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) | #0876E0 | 0.048 |
| Deuteranopia (no green cones) | #0069DA | 0.040 |
| Tritanopia (no blue cones) | #008297 | 0.149 |
| Achromatopsia (no color) | #6F6F6F | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4666DC
#4666DC
oklch(55.3% 0.184 268.3)
- #8D6D00
#8D6D00
oklch(55.1% 0.113 88.2)
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 #4666DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.011
- Neon Blue #4361EE ΔE 0.031
- Warm Blue #4B57DB ΔE 0.035
- Dark Periwinkle #665FD1 ΔE 0.044
- Cerulean Blue #056EEE ΔE 0.045
- Azul #1D5DEC ΔE 0.049
- Slate Blue #6A5ACD ΔE 0.055
- Iris #6258C4 ΔE 0.056
Use #4666DC 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.