#3664DC
Closest named color: Royal Blue (#4169E1). oklch(54.2% 0.191 264.8), rgb(54, 100, 220).
Aa
White text reads best on this color (5.23:1).
About this color
#3664DC is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.191 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.019 away. White text reads best on it, at 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.191) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.01:1 |
| White text | 5.23:1 |
Values
| HEX | #3664DC |
| RGB | rgb(54, 100, 220) |
| HSL | hsl(223, 70%, 54%) |
| OKLCH | oklch(54.2% 0.191 264.8) |
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 #3664DC | 5.23:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #3664DC | 4.01:1 | AA large text | Lc 28.6 | Dividers and decoration only |
| #3664DC text on white | 5.23:1 | AA | Lc 75.4 | Fine for body text |
| #3664DC text on black | 4.01:1 | AA large text | Lc -26.3 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A5C0F9
oklch(80.8% 0.086 264.8)
-
Step 400
400
#769EF6
oklch(70.8% 0.137 264.6)
-
Step 500
500
#5482F2
oklch(63% 0.175 265)
-
Step 600
600 (this color)
#3664DC
oklch(54.2% 0.191 264.8)
-
Step 700
700
#2D56C3
oklch(49% 0.177 264.9)
-
Step 800
800
#26479E
oklch(42.7% 0.147 265)
-
Step 900
900
#233D7D
oklch(37.7% 0.113 264.9)
-
Step 950
950
#142449
oklch(26.9% 0.072 264.5)
#3664DC 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) | #0074E0 | 0.042 |
| Deuteranopia (no green cones) | #0065DA | 0.026 |
| Tritanopia (no blue cones) | #008196 | 0.150 |
| Achromatopsia (no color) | #6C6C6C | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3664DC
#3664DC
oklch(54.2% 0.191 264.8)
- #8D6900
#8D6900
oklch(54.3% 0.111 84.8)
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 #3664DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.019
- Neon Blue #4361EE ΔE 0.031
- Warm Blue #4B57DB ΔE 0.034
- Azul #1D5DEC ΔE 0.036
- Cerulean Blue #056EEE ΔE 0.038
- Bright Blue #0165FC ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.059
- Iris #6258C4 ΔE 0.065
Use #3664DC 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.