#0366D6
Closest named color: Azul (#1D5DEC). oklch(53% 0.19 257.4), rgb(3, 102, 214).
Aa
White text reads best on this color (5.41:1).
About this color
#0366D6 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.190 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.041 away. White text reads best on it, at 5.41:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.190) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 3.87:1 |
| White text | 5.41:1 |
Values
| HEX | #0366D6 |
| RGB | rgb(3, 102, 214) |
| HSL | hsl(212, 97%, 43%) |
| OKLCH | oklch(53% 0.19 257.4) |
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 #0366D6 | 5.41:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #0366D6 | 3.87:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #0366D6 text on white | 5.41:1 | AA | Lc 76.2 | Fine for body text |
| #0366D6 text on black | 3.87:1 | AA large text | Lc -25.6 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBF9
oklch(88.5% 0.047 257.3)
-
Step 300
300
#9EC3F8
oklch(80.9% 0.085 257.3)
-
Step 400
400
#68A2F4
oklch(70.8% 0.135 257.2)
-
Step 500
500
#3C87F0
oklch(63% 0.174 257.5)
-
Step 600
600 (this color)
#0366D6
oklch(53% 0.19 257.4)
-
Step 700
700
#015BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#0A4B9D
oklch(42.7% 0.147 257.6)
-
Step 900
900
#13407C
oklch(37.7% 0.113 257.2)
-
Step 950
950
#0D2649
oklch(27.1% 0.072 257.4)
#0366D6 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) | #0773DA | 0.034 |
| Deuteranopia (no green cones) | #0062D4 | 0.011 |
| Tritanopia (no blue cones) | #008294 | 0.143 |
| Achromatopsia (no color) | #6A6A6A | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0366D6
#0366D6
oklch(53% 0.19 257.4)
- #8F6200
#8F6200
oklch(53% 0.111 77.4)
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 #0366D6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.041
- Cerulean Blue #056EEE ΔE 0.041
- Royal Blue #4169E1 ΔE 0.042
- Neon Blue #4361EE ΔE 0.054
- Warm Blue #4B57DB ΔE 0.055
- Bright Blue #0165FC ΔE 0.058
- Mid Blue #276AB3 ΔE 0.058
- Windows Blue #3778BF ΔE 0.071
Use #0366D6 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.