#3966FF
Closest named color: Bright Blue (#0165FC). oklch(57.5% 0.232 266.3), rgb(57, 102, 255).
Aa
White text reads best on this color (4.64:1).
About this color
#3966FF is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.232 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Blue (#0165FC), ΔE 0.028 away. White text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.232) |
| Temperature | cool |
| Nearest name | Bright Blue (#0165FC) |
| Black text | 4.51:1 |
| White text | 4.64:1 |
Values
| HEX | #3966FF |
| RGB | rgb(57, 102, 255) |
| HSL | hsl(226, 100%, 61%) |
| OKLCH | oklch(57.5% 0.232 266.3) |
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 #3966FF | 4.64:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #3966FF | 4.51:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #3966FF text on white | 4.64:1 | AA | Lc 71.6 | Content text, not long reading |
| #3966FF text on black | 4.51:1 | AA | Lc -30.1 | Non-text elements, placeholder text |
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
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600 (this color)
#3966FF
oklch(57.5% 0.232 266.3)
-
Step 700
700
#284DD8
oklch(49% 0.216 266.3)
-
Step 800
800
#2241AF
oklch(42.8% 0.179 266.4)
-
Step 900
900
#1F398A
oklch(37.7% 0.139 266.2)
-
Step 950
950
#122251
oklch(27% 0.089 266.3)
#3966FF 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) | #007EFF | 0.056 |
| Deuteranopia (no green cones) | #006BFC | 0.026 |
| Tritanopia (no blue cones) | #008DA9 | 0.180 |
| Achromatopsia (no color) | #747474 | 0.233 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3966FF
#3966FF
oklch(57.5% 0.232 266.3)
- #977300
#977300
oklch(57.5% 0.118 86.7)
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 #3966FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Blue #0165FC ΔE 0.028
- Neon Blue #4361EE ΔE 0.028
- Cerulean Blue #056EEE ΔE 0.039
- Azul #1D5DEC ΔE 0.044
- Clear Blue #247AFD ΔE 0.046
- Royal Blue #4169E1 ΔE 0.047
- Electric Blue #0652FF ΔE 0.056
- Warm Blue #4B57DB ΔE 0.064
Use #3966FF 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.