#3964EE
Closest named color: Neon Blue (#4361EE). oklch(55.7% 0.213 266.2), rgb(57, 100, 238).
Aa
White text reads best on this color (4.96:1).
About this color
#3964EE is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.213 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.011 away. White text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.213) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.23:1 |
| White text | 4.96:1 |
Values
| HEX | #3964EE |
| RGB | rgb(57, 100, 238) |
| HSL | hsl(226, 84%, 58%) |
| OKLCH | oklch(55.7% 0.213 266.2) |
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 #3964EE | 4.96:1 | AA | Lc -79.2 | Fine for body text |
| Black text on #3964EE | 4.23:1 | AA large text | Lc 30.3 | Non-text elements, placeholder text |
| #3964EE text on white | 4.96:1 | AA | Lc 73.7 | Content text, not long reading |
| #3964EE text on black | 4.23:1 | AA large text | Lc -28.0 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FD
oklch(88.5% 0.053 266.4)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#527FFE
oklch(63.2% 0.195 266.2)
-
Step 600
600 (this color)
#3964EE
oklch(55.7% 0.213 266.2)
-
Step 700
700
#2C51CF
oklch(49% 0.199 266.3)
-
Step 800
800
#2544A7
oklch(42.8% 0.163 266.2)
-
Step 900
900
#223A84
oklch(37.6% 0.128 266.6)
-
Step 950
950
#14234D
oklch(27% 0.08 266.3)
#3964EE 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) | #0079F3 | 0.051 |
| Deuteranopia (no green cones) | #0068EB | 0.027 |
| Tritanopia (no blue cones) | #00879F | 0.168 |
| Achromatopsia (no color) | #707070 | 0.214 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3964EE
#3964EE
oklch(55.7% 0.213 266.2)
- #916E00
#916E00
oklch(55.8% 0.114 86.4)
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 #3964EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.011
- Royal Blue #4169E1 ΔE 0.025
- Azul #1D5DEC ΔE 0.029
- Cerulean Blue #056EEE ΔE 0.030
- Bright Blue #0165FC ΔE 0.033
- Warm Blue #4B57DB ΔE 0.042
- Clear Blue #247AFD ΔE 0.055
- Electric Blue #0652FF ΔE 0.058
Use #3964EE 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.