#366FE8
Closest named color: Royal Blue (#4169E1). oklch(57.3% 0.193 262.8), rgb(54, 111, 232).
Aa
Black text reads best on this color (4.59:1).
About this color
#366FE8 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.193 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.018 away. Black text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.59:1 |
| White text | 4.56:1 |
Values
| HEX | #366FE8 |
| RGB | rgb(54, 111, 232) |
| HSL | hsl(221, 79%, 56%) |
| OKLCH | oklch(57.3% 0.193 262.8) |
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 #366FE8 | 4.56:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #366FE8 | 4.59:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #366FE8 text on white | 4.56:1 | AA | Lc 71.2 | Content text, not long reading |
| #366FE8 text on black | 4.59:1 | AA | Lc -30.5 | 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
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAFA
oklch(88.5% 0.048 262)
-
Step 300
300
#A3C1FA
oklch(80.9% 0.087 263)
-
Step 400
400
#719FF7
oklch(70.8% 0.139 262.4)
-
Step 500
500
#4D83F3
oklch(63% 0.178 263)
-
Step 600
600 (this color)
#366FE8
oklch(57.3% 0.193 262.8)
-
Step 700
700
#2457C5
oklch(49.1% 0.181 262.8)
-
Step 800
800
#1F489F
oklch(42.7% 0.149 262.8)
-
Step 900
900
#1E3D7E
oklch(37.6% 0.116 262.9)
-
Step 950
950
#12254A
oklch(27.1% 0.073 262.2)
#366FE8 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) | #157EEC | 0.038 |
| Deuteranopia (no green cones) | #006EE6 | 0.025 |
| Tritanopia (no blue cones) | #008CA1 | 0.150 |
| Achromatopsia (no color) | #767676 | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366FE8
#366FE8
oklch(57.3% 0.193 262.8)
- #9A7000
#9A7000
oklch(57.2% 0.118 82.4)
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 #366FE8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.018
- Cerulean Blue #056EEE ΔE 0.024
- Neon Blue #4361EE ΔE 0.035
- Clear Blue #247AFD ΔE 0.039
- Bright Blue #0165FC ΔE 0.048
- Azul #1D5DEC ΔE 0.050
- Warm Blue #4B57DB ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.068
Use #366FE8 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.