#3964CF
Closest named color: Royal Blue (#4169E1). oklch(53.3% 0.173 264.7), rgb(57, 100, 207).
Aa
White text reads best on this color (5.38:1).
About this color
#3964CF is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.173 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.032 away. White text reads best on it, at 5.38:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.89:1 |
| White text | 5.38:1 |
Values
| HEX | #3964CF |
| RGB | rgb(57, 100, 207) |
| HSL | hsl(223, 61%, 52%) |
| OKLCH | oklch(53.3% 0.173 264.7) |
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 #3964CF | 5.38:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #3964CF | 3.89:1 | AA large text | Lc 27.7 | Dividers and decoration only |
| #3964CF text on white | 5.38:1 | AA | Lc 76.4 | Fine for body text |
| #3964CF text on black | 3.89:1 | AA large text | Lc -25.3 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBD9F7
oklch(88.4% 0.044 265.6)
-
Step 300
300
#A8C1F4
oklch(81% 0.078 264.3)
-
Step 400
400
#7A9EEE
oklch(70.6% 0.124 265)
-
Step 500
500
#5984E9
oklch(63.1% 0.159 264.9)
-
Step 600
600 (this color)
#3964CF
oklch(53.3% 0.173 264.7)
-
Step 700
700
#3259BA
oklch(49.2% 0.16 264.7)
-
Step 800
800
#294997
oklch(42.7% 0.134 264.6)
-
Step 900
900
#253E78
oklch(37.7% 0.104 264.4)
-
Step 950
950
#162546
oklch(27.1% 0.065 264.1)
#3964CF 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) | #1D72D3 | 0.037 |
| Deuteranopia (no green cones) | #0064CD | 0.030 |
| Tritanopia (no blue cones) | #007E90 | 0.138 |
| Achromatopsia (no color) | #6A6A6A | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3964CF
#3964CF
oklch(53.3% 0.173 264.7)
- #8A6600
#8A6600
oklch(53.3% 0.109 84.2)
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 #3964CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.032
- Warm Blue #4B57DB ΔE 0.039
- Neon Blue #4361EE ΔE 0.050
- Mid Blue #276AB3 ΔE 0.051
- Azul #1D5DEC ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.055
- Iris #6258C4 ΔE 0.056
Use #3964CF 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.