#3663E8
Closest named color: Neon Blue (#4361EE). oklch(54.9% 0.207 265.6), rgb(54, 99, 232).
Aa
White text reads best on this color (5.11:1).
About this color
#3663E8 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.207 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.016 away. White text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.207) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.10:1 |
| White text | 5.11:1 |
Values
| HEX | #3663E8 |
| RGB | rgb(54, 99, 232) |
| HSL | hsl(225, 79%, 56%) |
| OKLCH | oklch(54.9% 0.207 265.6) |
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 #3663E8 | 5.11:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #3663E8 | 4.10:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #3663E8 text on white | 5.11:1 | AA | Lc 74.7 | Content text, not long reading |
| #3663E8 text on black | 4.10:1 | AA large text | Lc -27.0 | 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
#C9D9FC
oklch(88.5% 0.051 265.9)
-
Step 300
300
#A4C0FE
oklch(81% 0.093 265.6)
-
Step 400
400
#749CFD
oklch(70.6% 0.149 265.8)
-
Step 500
500
#5180FB
oklch(63.1% 0.19 265.5)
-
Step 600
600 (this color)
#3663E8
oklch(54.9% 0.207 265.6)
-
Step 700
700
#2B53CC
oklch(49.1% 0.193 265.6)
-
Step 800
800
#2445A5
oklch(42.8% 0.16 265.5)
-
Step 900
900
#213B83
oklch(37.7% 0.125 265.7)
-
Step 950
950
#14234C
oklch(26.9% 0.078 266.1)
#3663E8 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) | #0076EC | 0.047 |
| Deuteranopia (no green cones) | #0066E5 | 0.026 |
| Tritanopia (no blue cones) | #00849C | 0.162 |
| Achromatopsia (no color) | #6E6E6E | 0.208 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3663E8
#3663E8
oklch(54.9% 0.207 265.6)
- #8F6B00
#8F6B00
oklch(54.9% 0.112 85.2)
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 #3663E8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.016
- Royal Blue #4169E1 ΔE 0.022
- Azul #1D5DEC ΔE 0.025
- Cerulean Blue #056EEE ΔE 0.031
- Warm Blue #4B57DB ΔE 0.037
- Bright Blue #0165FC ΔE 0.037
- Electric Blue #0652FF ΔE 0.059
- Clear Blue #247AFD ΔE 0.061
Use #3663E8 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.