#0366CC
Closest named color: Mid Blue (#276AB3). oklch(52.2% 0.177 256), rgb(3, 102, 204).
Aa
White text reads best on this color (5.56:1).
About this color
#0366CC is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.177 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.044 away. White text reads best on it, at 5.56:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.177) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.77:1 |
| White text | 5.56:1 |
Values
| HEX | #0366CC |
| RGB | rgb(3, 102, 204) |
| HSL | hsl(210, 97%, 41%) |
| OKLCH | oklch(52.2% 0.177 256) |
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 #0366CC | 5.56:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #0366CC | 3.77:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #0366CC text on white | 5.56:1 | AA | Lc 77.0 | Fine for body text |
| #0366CC text on black | 3.77:1 | AA large text | Lc -24.8 | 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 700.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBF9
oklch(88.5% 0.048 256.2)
-
Step 300
300
#9CC3F8
oklch(80.8% 0.086 256.2)
-
Step 400
400
#65A2F4
oklch(70.6% 0.137 256.2)
-
Step 500
500
#3688F0
oklch(63% 0.175 256.1)
-
Step 600
600
#006FDF
oklch(55.6% 0.191 256.1)
-
Step 700
700 (this color)
#0366CC
oklch(52.2% 0.177 256)
-
Step 800
800
#004C9C
oklch(42.7% 0.146 256)
-
Step 900
900
#0F407C
oklch(37.6% 0.114 256.2)
-
Step 950
950
#0B2649
oklch(27% 0.073 256.3)
#0366CC 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) | #2271D0 | 0.034 |
| Deuteranopia (no green cones) | #0060CA | 0.016 |
| Tritanopia (no blue cones) | #007F8F | 0.132 |
| Achromatopsia (no color) | #686868 | 0.177 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0366CC
#0366CC
oklch(52.2% 0.177 256)
- #8D5F00
#8D5F00
oklch(52.2% 0.11 76)
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 #0366CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.044
- Royal Blue #4169E1 ΔE 0.051
- Azul #1D5DEC ΔE 0.055
- Cerulean Blue #056EEE ΔE 0.055
- Warm Blue #4B57DB ΔE 0.061
- French Blue #436BAD ΔE 0.064
- Windows Blue #3778BF ΔE 0.065
- Neon Blue #4361EE ΔE 0.067
Use #0366CC 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.