#366BFF
Closest named color: Bright Blue (#0165FC). oklch(58.3% 0.227 265), rgb(54, 107, 255).
Aa
Black text reads best on this color (4.70:1).
About this color
#366BFF is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.227 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Blue (#0165FC), ΔE 0.031 away. Black text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.227) |
| Temperature | cool |
| Nearest name | Bright Blue (#0165FC) |
| Black text | 4.70:1 |
| White text | 4.46:1 |
Values
| HEX | #366BFF |
| RGB | rgb(54, 107, 255) |
| HSL | hsl(224, 100%, 61%) |
| OKLCH | oklch(58.3% 0.227 265) |
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 #366BFF | 4.46:1 | AA large text | Lc -75.8 | Fine for body text |
| Black text on #366BFF | 4.70:1 | AA | Lc 33.8 | Non-text elements, placeholder text |
| #366BFF text on white | 4.46:1 | AA large text | Lc 70.3 | Content text, not long reading |
| #366BFF text on black | 4.70:1 | AA | Lc -31.4 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#719CFF
oklch(70.6% 0.153 265)
-
Step 500
500
#4D80FF
oklch(63.2% 0.197 264.8)
-
Step 600
600 (this color)
#366BFF
oklch(58.3% 0.227 265)
-
Step 700
700
#2350D6
oklch(49.2% 0.211 264.9)
-
Step 800
800
#1E42AD
oklch(42.6% 0.176 265.2)
-
Step 900
900
#1C3A89
oklch(37.7% 0.137 264.8)
-
Step 950
950
#112350
oklch(27.1% 0.086 264.8)
#366BFF 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) | #0081FF | 0.052 |
| Deuteranopia (no green cones) | #006EFC | 0.023 |
| Tritanopia (no blue cones) | #0091AB | 0.177 |
| Achromatopsia (no color) | #777777 | 0.228 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366BFF
#366BFF
oklch(58.3% 0.227 265)
- #9B7400
#9B7400
oklch(58.2% 0.119 85)
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 #366BFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Blue #0165FC ΔE 0.031
- Neon Blue #4361EE ΔE 0.034
- Cerulean Blue #056EEE ΔE 0.035
- Clear Blue #247AFD ΔE 0.035
- Royal Blue #4169E1 ΔE 0.046
- Azul #1D5DEC ΔE 0.050
- Electric Blue #0652FF ΔE 0.065
- Warm Blue #4B57DB ΔE 0.070
Use #366BFF 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.