#366CB1
Closest named color: French Blue (#436BAD). oklch(52.9% 0.123 255.6), rgb(54, 108, 177).
Aa
White text reads best on this color (5.33:1).
About this color
#366CB1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.123 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.013 away. White text reads best on it, at 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.93:1 |
| White text | 5.33:1 |
Values
| HEX | #366CB1 |
| RGB | rgb(54, 108, 177) |
| HSL | hsl(214, 53%, 45%) |
| OKLCH | oklch(52.9% 0.123 255.6) |
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 #366CB1 | 5.33:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #366CB1 | 3.93:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #366CB1 text on white | 5.33:1 | AA | Lc 76.3 | Fine for body text |
| #366CB1 text on black | 3.93:1 | AA large text | Lc -25.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CCDBEE
oklch(88.6% 0.031 254.3)
-
Step 300
300
#A9C3E5
oklch(80.9% 0.056 255.2)
-
Step 400
400
#7BA3D8
oklch(70.7% 0.09 255.7)
-
Step 500
500
#598BCD
oklch(63% 0.114 255.8)
-
Step 600
600 (this color)
#366CB1
oklch(52.9% 0.123 255.6)
-
Step 700
700
#3061A0
oklch(49% 0.115 255.7)
-
Step 800
800
#295082
oklch(42.8% 0.095 255.6)
-
Step 900
900
#254268
oklch(37.6% 0.074 255.8)
-
Step 950
950
#16273D
oklch(27% 0.047 255.4)
#366CB1 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) | #4D71B4 | 0.029 |
| Deuteranopia (no green cones) | #3A66B0 | 0.016 |
| Tritanopia (no blue cones) | #007C86 | 0.097 |
| Achromatopsia (no color) | #6B6B6B | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366CB1
#366CB1
oklch(52.9% 0.123 255.6)
- #906100
#906100
oklch(53% 0.111 75.9)
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 #366CB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.013
- Mid Blue #276AB3 ΔE 0.014
- Flat Blue #3C73A8 ΔE 0.028
- Muted Blue #3B719F ΔE 0.035
- Windows Blue #3778BF ΔE 0.037
- Nice Blue #107AB0 ΔE 0.042
- Ocean Blue #03719C ΔE 0.047
- Dull Blue #49759C ΔE 0.051
Use #366CB1 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.