#366DAD
Closest named color: French Blue (#436BAD). oklch(52.9% 0.117 253.8), rgb(54, 109, 173).
Aa
White text reads best on this color (5.31:1).
About this color
#366DAD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.117 and its hue 254°. 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 5.31:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.94:1 |
| White text | 5.31:1 |
Values
| HEX | #366DAD |
| RGB | rgb(54, 109, 173) |
| HSL | hsl(212, 52%, 45%) |
| OKLCH | oklch(52.9% 0.117 253.8) |
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 #366DAD | 5.31:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #366DAD | 3.94:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #366DAD text on white | 5.31:1 | AA | Lc 76.2 | Fine for body text |
| #366DAD text on black | 3.94:1 | 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
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBED
oklch(88.6% 0.03 253)
-
Step 300
300
#AAC3E3
oklch(80.9% 0.053 254.7)
-
Step 400
400
#7CA4D4
oklch(70.8% 0.083 253.4)
-
Step 500
500
#598CC9
oklch(63% 0.108 253.7)
-
Step 600
600 (this color)
#366DAD
oklch(52.9% 0.117 253.8)
-
Step 700
700
#30629D
oklch(49.1% 0.109 254.1)
-
Step 800
800
#29507F
oklch(42.6% 0.09 254.3)
-
Step 900
900
#254366
oklch(37.7% 0.07 253.4)
-
Step 950
950
#16273C
oklch(26.9% 0.046 254.4)
#366DAD 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) | #5071B0 | 0.031 |
| Deuteranopia (no green cones) | #3F66AC | 0.020 |
| Tritanopia (no blue cones) | #007C85 | 0.091 |
| Achromatopsia (no color) | #6B6B6B | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366DAD
#366DAD
oklch(52.9% 0.117 253.8)
- #916000
#916000
oklch(52.9% 0.112 74.4)
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 #366DAD, 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 0.019
- Flat Blue #3C73A8 ΔE 0.022
- Muted Blue #3B719F ΔE 0.028
- Windows Blue #3778BF ΔE 0.038
- Nice Blue #107AB0 ΔE 0.038
- Ocean Blue #03719C ΔE 0.041
- Dull Blue #49759C ΔE 0.044
Use #366DAD 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.