#3963EF
Closest named color: Neon Blue (#4361EE). oklch(55.6% 0.216 266.4), rgb(57, 99, 239).
Aa
White text reads best on this color (4.99:1).
About this color
#3963EF is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.216 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.010 away. White text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.216) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.20:1 |
| White text | 4.99:1 |
Values
| HEX | #3963EF |
| RGB | rgb(57, 99, 239) |
| HSL | hsl(226, 85%, 58%) |
| OKLCH | oklch(55.6% 0.216 266.4) |
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 #3963EF | 4.99:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #3963EF | 4.20:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #3963EF text on white | 4.99:1 | AA | Lc 73.9 | Content text, not long reading |
| #3963EF text on black | 4.20:1 | AA large text | Lc -27.8 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FE
oklch(88.5% 0.054 266.8)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#759CFF
oklch(70.8% 0.151 266.4)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600 (this color)
#3963EF
oklch(55.6% 0.216 266.4)
-
Step 700
700
#2C51D0
oklch(49.1% 0.2 266.3)
-
Step 800
800
#2543A8
oklch(42.7% 0.166 266.5)
-
Step 900
900
#223A85
oklch(37.7% 0.129 266.7)
-
Step 950
950
#14234E
oklch(27.1% 0.082 266.5)
#3963EF 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) | #0078F4 | 0.051 |
| Deuteranopia (no green cones) | #0067EC | 0.028 |
| Tritanopia (no blue cones) | #00869F | 0.169 |
| Achromatopsia (no color) | #6F6F6F | 0.216 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3963EF
#3963EF
oklch(55.6% 0.216 266.4)
- #906E00
#906E00
oklch(55.7% 0.114 87.1)
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 #3963EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.010
- Azul #1D5DEC ΔE 0.028
- Royal Blue #4169E1 ΔE 0.028
- Bright Blue #0165FC ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.032
- Warm Blue #4B57DB ΔE 0.042
- Electric Blue #0652FF ΔE 0.056
- Clear Blue #247AFD ΔE 0.056
Use #3963EF 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.