#3963BC
Closest named color: Mid Blue (#276AB3). oklch(51.7% 0.148 263.2), rgb(57, 99, 188).
Aa
White text reads best on this color (5.69:1).
About this color
#3963BC is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.148 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.028 away. White text reads best on it, at 5.69:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.68:1 |
| White text | 5.69:1 |
Values
| HEX | #3963BC |
| RGB | rgb(57, 99, 188) |
| HSL | hsl(221, 53%, 48%) |
| OKLCH | oklch(51.7% 0.148 263.2) |
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 #3963BC | 5.69:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #3963BC | 3.68:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #3963BC text on white | 5.69:1 | AA | Lc 78.2 | Fine for body text |
| #3963BC text on black | 3.68:1 | AA large text | Lc -23.6 | 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 700.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF4
oklch(88.6% 0.039 262.9)
-
Step 300
300
#A9C1F0
oklch(80.9% 0.072 263.7)
-
Step 400
400
#7BA0E8
oklch(70.8% 0.114 263)
-
Step 500
500
#5986E1
oklch(63.1% 0.146 263)
-
Step 600
600
#406ECF
oklch(55.7% 0.158 263.1)
-
Step 700
700 (this color)
#3963BC
oklch(51.7% 0.148 263.2)
-
Step 800
800
#2A4B91
oklch(42.7% 0.122 263.2)
-
Step 900
900
#263F74
oklch(37.7% 0.096 263.5)
-
Step 950
950
#162544
oklch(26.9% 0.061 263.4)
#3963BC 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) | #346DBF | 0.026 |
| Deuteranopia (no green cones) | #1661BA | 0.027 |
| Tritanopia (no blue cones) | #007886 | 0.120 |
| Achromatopsia (no color) | #666666 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3963BC
#3963BC
oklch(51.7% 0.148 263.2)
- #856100
#856100
oklch(51.6% 0.106 83.1)
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 #3963BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.028
- French Blue #436BAD ΔE 0.037
- Windows Blue #3778BF ΔE 0.057
- Iris #6258C4 ΔE 0.057
- Royal Blue #4169E1 ΔE 0.059
- Flat Blue #3C73A8 ΔE 0.060
- Warm Blue #4B57DB ΔE 0.061
- Dusky Blue #475F94 ΔE 0.063
Use #3963BC 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.