#3660EF
Closest named color: Neon Blue (#4361EE). oklch(54.9% 0.22 266.4), rgb(54, 96, 239).
Aa
White text reads best on this color (5.15:1).
About this color
#3660EF is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.220 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 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.220) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #3660EF |
| RGB | rgb(54, 96, 239) |
| HSL | hsl(226, 85%, 57%) |
| OKLCH | oklch(54.9% 0.22 266.4) |
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 #3660EF | 5.15:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #3660EF | 4.07:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #3660EF text on white | 5.15:1 | AA | Lc 74.8 | Content text, not long reading |
| #3660EF text on black | 4.07:1 | AA large text | Lc -26.9 | 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
#E1EAFE
oklch(93.6% 0.029 266.4)
-
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
#759CFF
oklch(70.8% 0.151 266.4)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600 (this color)
#3660EF
oklch(54.9% 0.22 266.4)
-
Step 700
700
#2B50D2
oklch(49.1% 0.204 266.3)
-
Step 800
800
#2443AA
oklch(42.8% 0.169 266.3)
-
Step 900
900
#213A86
oklch(37.7% 0.131 266.3)
-
Step 950
950
#13234F
oklch(27.1% 0.084 265.9)
#3660EF 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) | #0076F4 | 0.052 |
| Deuteranopia (no green cones) | #0065EC | 0.026 |
| Tritanopia (no blue cones) | #00859E | 0.173 |
| Achromatopsia (no color) | #6D6D6D | 0.220 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3660EF
#3660EF
oklch(54.9% 0.22 266.4)
- #8E6C00
#8E6C00
oklch(55% 0.113 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 #3660EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.013
- Azul #1D5DEC ΔE 0.021
- Bright Blue #0165FC ΔE 0.030
- Royal Blue #4169E1 ΔE 0.033
- Cerulean Blue #056EEE ΔE 0.035
- Warm Blue #4B57DB ΔE 0.040
- Electric Blue #0652FF ΔE 0.049
- Clear Blue #247AFD ΔE 0.063
Use #3660EF 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.