#366BAC
Closest named color: French Blue (#436BAD). oklch(52.3% 0.118 254.8), rgb(54, 107, 172).
Aa
White text reads best on this color (5.44:1).
About this color
#366BAC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.118 and its hue 255°. 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 5.44:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.85:1 |
| White text | 5.44:1 |
Values
| HEX | #366BAC |
| RGB | rgb(54, 107, 172) |
| HSL | hsl(213, 52%, 44%) |
| OKLCH | oklch(52.3% 0.118 254.8) |
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 #366BAC | 5.44:1 | AA | Lc -82.2 | Fine for body text |
| Black text on #366BAC | 3.85:1 | AA large text | Lc 27.2 | Dividers and decoration only |
| #366BAC text on white | 5.44:1 | AA | Lc 76.9 | Fine for body text |
| #366BAC text on black | 3.85:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CBDBEE
oklch(88.5% 0.031 252.7)
-
Step 300
300
#A8C3E5
oklch(80.9% 0.057 254.3)
-
Step 400
400
#79A3D9
oklch(70.6% 0.092 255)
-
Step 500
500
#568CCE
oklch(63.2% 0.116 254.3)
-
Step 600
600
#3A74BB
oklch(55.5% 0.127 254.8)
-
Step 700
700 (this color)
#366BAC
oklch(52.3% 0.118 254.8)
-
Step 800
800
#265083
oklch(42.8% 0.097 254.7)
-
Step 900
900
#244369
oklch(37.8% 0.075 254.5)
-
Step 950
950
#15273D
oklch(26.9% 0.048 254.2)
#366BAC 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) | #4E70AF | 0.031 |
| Deuteranopia (no green cones) | #3D64AB | 0.020 |
| Tritanopia (no blue cones) | #007A83 | 0.093 |
| Achromatopsia (no color) | #6A6A6A | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366BAC
#366BAC
oklch(52.3% 0.118 254.8)
- #8F5F00
#8F5F00
oklch(52.4% 0.111 74.7)
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 #366BAC, 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 0.016
- Flat Blue #3C73A8 ΔE 0.027
- Muted Blue #3B719F ΔE 0.031
- Ocean Blue #03719C ΔE 0.042
- Windows Blue #3778BF ΔE 0.043
- Nice Blue #107AB0 ΔE 0.043
- Dusky Blue #475F94 ΔE 0.046
Use #366BAC 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.