#366BA5
Closest named color: French Blue (#436BAD). oklch(51.9% 0.108 252.4), rgb(54, 107, 165).
Aa
White text reads best on this color (5.52:1).
About this color
#366BA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.108 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.019 away. White text reads best on it, at 5.52:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.80:1 |
| White text | 5.52:1 |
Values
| HEX | #366BA5 |
| RGB | rgb(54, 107, 165) |
| HSL | hsl(211, 51%, 43%) |
| OKLCH | oklch(51.9% 0.108 252.4) |
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 #366BA5 | 5.52:1 | AA | Lc -82.6 | Fine for body text |
| Black text on #366BA5 | 3.80:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #366BA5 text on white | 5.52:1 | AA | Lc 77.3 | Fine for body text |
| #366BA5 text on black | 3.80:1 | AA large text | Lc -24.4 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBEC
oklch(88.5% 0.029 251.5)
-
Step 300
300
#A9C3E2
oklch(80.8% 0.052 253)
-
Step 400
400
#7AA4D4
oklch(70.7% 0.084 252.3)
-
Step 500
500
#588DC8
oklch(63.2% 0.106 252.2)
-
Step 600
600
#3C76B5
oklch(55.6% 0.116 252.3)
-
Step 700
700 (this color)
#366BA5
oklch(51.9% 0.108 252.4)
-
Step 800
800
#27517E
oklch(42.7% 0.089 252)
-
Step 900
900
#244366
oklch(37.7% 0.071 252.7)
-
Step 950
950
#16283B
oklch(27.1% 0.043 250.9)
#366BA5 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) | #516EA7 | 0.031 |
| Deuteranopia (no green cones) | #4264A4 | 0.021 |
| Tritanopia (no blue cones) | #007880 | 0.084 |
| Achromatopsia (no color) | #696969 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366BA5
#366BA5
oklch(51.9% 0.108 252.4)
- #8E5D08
#8E5D08
oklch(51.9% 0.108 72.6)
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 #366BA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.019
- Muted Blue #3B719F ΔE 0.023
- Flat Blue #3C73A8 ΔE 0.024
- Mid Blue #276AB3 ΔE 0.025
- Ocean Blue #03719C ΔE 0.035
- Dusky Blue #475F94 ΔE 0.040
- Denim #3B638C ΔE 0.042
- Peacock Blue #016795 ΔE 0.042
Use #366BA5 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.