#3664EC
Closest named color: Neon Blue (#4361EE). oklch(55.4% 0.211 265.6), rgb(54, 100, 236).
Aa
White text reads best on this color (5.01:1).
About this color
#3664EC is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.211 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.013 away. White text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.211) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.19:1 |
| White text | 5.01:1 |
Values
| HEX | #3664EC |
| RGB | rgb(54, 100, 236) |
| HSL | hsl(225, 83%, 57%) |
| OKLCH | oklch(55.4% 0.211 265.6) |
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 #3664EC | 5.01:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #3664EC | 4.19:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #3664EC text on white | 5.01:1 | AA | Lc 74.0 | Content text, not long reading |
| #3664EC text on black | 4.19:1 | AA large text | Lc -27.7 | 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
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#507FFD
oklch(63% 0.195 265.7)
-
Step 600
600 (this color)
#3664EC
oklch(55.4% 0.211 265.6)
-
Step 700
700
#2A52CE
oklch(49.1% 0.197 265.6)
-
Step 800
800
#2344A6
oklch(42.6% 0.163 265.6)
-
Step 900
900
#203B84
oklch(37.7% 0.127 265.4)
-
Step 950
950
#13234D
oklch(26.9% 0.08 265.6)
#3664EC 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) | #0078F1 | 0.049 |
| Deuteranopia (no green cones) | #0067E9 | 0.025 |
| Tritanopia (no blue cones) | #00869E | 0.165 |
| Achromatopsia (no color) | #6F6F6F | 0.212 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3664EC
#3664EC
oklch(55.4% 0.211 265.6)
- #916D00
#916D00
oklch(55.6% 0.114 85.6)
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 #3664EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.013
- Royal Blue #4169E1 ΔE 0.024
- Azul #1D5DEC ΔE 0.026
- Cerulean Blue #056EEE ΔE 0.029
- Bright Blue #0165FC ΔE 0.033
- Warm Blue #4B57DB ΔE 0.041
- Clear Blue #247AFD ΔE 0.056
- Electric Blue #0652FF ΔE 0.058
Use #3664EC 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.