#366FB0
Closest named color: French Blue (#436BAD). oklch(53.5% 0.119 253.5), rgb(54, 111, 176).
Aa
White text reads best on this color (5.17:1).
About this color
#366FB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.119 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.015 away. White text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.05:1 |
| White text | 5.17:1 |
Values
| HEX | #366FB0 |
| RGB | rgb(54, 111, 176) |
| HSL | hsl(212, 53%, 45%) |
| OKLCH | oklch(53.5% 0.119 253.5) |
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 #366FB0 | 5.17:1 | AA | Lc -80.7 | Fine for body text |
| Black text on #366FB0 | 4.05:1 | AA large text | Lc 28.7 | Dividers and decoration only |
| #366FB0 text on white | 5.17:1 | AA | Lc 75.4 | Fine for body text |
| #366FB0 text on black | 4.05:1 | AA large text | Lc -26.4 | 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 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
#A9C3E3
oklch(80.8% 0.054 253.8)
-
Step 400
400
#7BA4D5
oklch(70.8% 0.085 253.3)
-
Step 500
500
#588CCA
oklch(63% 0.109 253.7)
-
Step 600
600 (this color)
#366FB0
oklch(53.5% 0.119 253.5)
-
Step 700
700
#2E629D
oklch(49% 0.11 253.4)
-
Step 800
800
#275080
oklch(42.6% 0.093 253.9)
-
Step 900
900
#254366
oklch(37.7% 0.07 253.4)
-
Step 950
950
#16273C
oklch(26.9% 0.046 254.4)
#366FB0 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) | #5273B3 | 0.033 |
| Deuteranopia (no green cones) | #4068AF | 0.020 |
| Tritanopia (no blue cones) | #007E87 | 0.092 |
| Achromatopsia (no color) | #6D6D6D | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366FB0
#366FB0
oklch(53.5% 0.119 253.5)
- #946100
#946100
oklch(53.5% 0.114 73.4)
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 #366FB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.015
- Flat Blue #3C73A8 ΔE 0.020
- Mid Blue #276AB3 ΔE 0.021
- Muted Blue #3B719F ΔE 0.029
- Windows Blue #3778BF ΔE 0.032
- Nice Blue #107AB0 ΔE 0.034
- Ocean Blue #03719C ΔE 0.044
- Dull Blue #49759C ΔE 0.044
Use #366FB0 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.