#366DF5
Closest named color: Cerulean Blue (#056EEE). oklch(57.9% 0.212 264.1), rgb(54, 109, 245).
Aa
Black text reads best on this color (4.66:1).
About this color
#366DF5 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.212 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.025 away. Black text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.212) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #366DF5 |
| RGB | rgb(54, 109, 245) |
| HSL | hsl(223, 91%, 59%) |
| OKLCH | oklch(57.9% 0.212 264.1) |
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 #366DF5 | 4.50:1 | AA | Lc -76.1 | Fine for body text |
| Black text on #366DF5 | 4.66:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #366DF5 text on white | 4.50:1 | AA | Lc 70.7 | Content text, not long reading |
| #366DF5 text on black | 4.66:1 | AA | Lc -31.0 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C8DAFD
oklch(88.6% 0.052 263.7)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4B80FE
oklch(63% 0.196 264.3)
-
Step 600
600 (this color)
#366DF5
oklch(57.9% 0.212 264.1)
-
Step 700
700
#2353CE
oklch(49% 0.197 264.1)
-
Step 800
800
#1E45A7
oklch(42.7% 0.164 264.1)
-
Step 900
900
#1D3C84
oklch(37.8% 0.127 263.8)
-
Step 950
950
#12244D
oklch(27.1% 0.079 264)
#366DF5 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) | #0080FA | 0.046 |
| Deuteranopia (no green cones) | #006EF2 | 0.024 |
| Tritanopia (no blue cones) | #008FA6 | 0.167 |
| Achromatopsia (no color) | #777777 | 0.213 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366DF5
#366DF5
oklch(57.9% 0.212 264.1)
- #9B7300
#9B7300
oklch(58% 0.119 84.2)
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 #366DF5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.025
- Neon Blue #4361EE ΔE 0.029
- Royal Blue #4169E1 ΔE 0.032
- Clear Blue #247AFD ΔE 0.032
- Bright Blue #0165FC ΔE 0.035
- Azul #1D5DEC ΔE 0.047
- Warm Blue #4B57DB ΔE 0.063
- Cornflower #6A79F7 ΔE 0.067
Use #366DF5 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.