#3664D3
Closest named color: Royal Blue (#4169E1). oklch(53.5% 0.179 264.2), rgb(54, 100, 211).
Aa
White text reads best on this color (5.35:1).
About this color
#3664D3 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.179 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.028 away. White text reads best on it, at 5.35:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.92:1 |
| White text | 5.35:1 |
Values
| HEX | #3664D3 |
| RGB | rgb(54, 100, 211) |
| HSL | hsl(222, 64%, 52%) |
| OKLCH | oklch(53.5% 0.179 264.2) |
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 #3664D3 | 5.35:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #3664D3 | 3.92:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #3664D3 text on white | 5.35:1 | AA | Lc 76.2 | Fine for body text |
| #3664D3 text on black | 3.92:1 | AA large text | Lc -25.5 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF8
oklch(88.6% 0.045 263.1)
-
Step 300
300
#A7C1F5
oklch(81% 0.079 264)
-
Step 400
400
#789EF1
oklch(70.6% 0.129 264.6)
-
Step 500
500
#5684EC
oklch(63.2% 0.164 264.3)
-
Step 600
600 (this color)
#3664D3
oklch(53.5% 0.179 264.2)
-
Step 700
700
#2E58BD
oklch(49% 0.166 264.2)
-
Step 800
800
#274999
oklch(42.8% 0.137 264.1)
-
Step 900
900
#243E7A
oklch(37.8% 0.107 264.3)
-
Step 950
950
#152547
oklch(27.1% 0.067 263.6)
#3664D3 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) | #1372D7 | 0.037 |
| Deuteranopia (no green cones) | #0064D1 | 0.027 |
| Tritanopia (no blue cones) | #007F92 | 0.141 |
| Achromatopsia (no color) | #6B6B6B | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3664D3
#3664D3
oklch(53.5% 0.179 264.2)
- #8B6700
#8B6700
oklch(53.6% 0.11 84.4)
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 #3664D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.028
- Warm Blue #4B57DB ΔE 0.037
- Neon Blue #4361EE ΔE 0.044
- Azul #1D5DEC ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.048
- Mid Blue #276AB3 ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.057
- Iris #6258C4 ΔE 0.060
Use #3664D3 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.