#366B8A
Closest named color: Denim (#3B638C). oklch(50.5% 0.075 236.5), rgb(54, 107, 138).
Aa
White text reads best on this color (5.79:1).
About this color
#366B8A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.075 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.025 away. White text reads best on it, at 5.79:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.62:1 |
| White text | 5.79:1 |
Values
| HEX | #366B8A |
| RGB | rgb(54, 107, 138) |
| HSL | hsl(202, 44%, 38%) |
| OKLCH | oklch(50.5% 0.075 236.5) |
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 #366B8A | 5.79:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #366B8A | 3.62:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #366B8A text on white | 5.79:1 | AA | Lc 78.8 | Fine for body text |
| #366B8A text on black | 3.62:1 | AA large text | Lc -23.0 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CDDCE5
oklch(88.6% 0.02 233.9)
-
Step 300
300
#ABC5D5
oklch(80.9% 0.036 234.9)
-
Step 400
400
#7EA7C1
oklch(70.8% 0.059 236.5)
-
Step 500
500
#5C91B1
oklch(63.2% 0.074 236.1)
-
Step 600
600
#407A9D
oklch(55.5% 0.082 237.2)
-
Step 700
700 (this color)
#366B8A
oklch(50.5% 0.075 236.5)
-
Step 800
800
#2A546D
oklch(42.7% 0.063 236.9)
-
Step 900
900
#274658
oklch(37.8% 0.048 235.5)
-
Step 950
950
#172934
oklch(27.1% 0.031 236.4)
#366B8A 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) | #5D6A8B | 0.046 |
| Deuteranopia (no green cones) | #516289 | 0.037 |
| Tritanopia (no blue cones) | #007375 | 0.055 |
| Achromatopsia (no color) | #656565 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366B8A
#366B8A
oklch(50.5% 0.075 236.5)
- #855938
#855938
oklch(50.4% 0.075 56.9)
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 #366B8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.025
- Sea Blue #047495 ΔE 0.033
- Ocean Blue #03719C ΔE 0.035
- Muted Blue #3B719F ΔE 0.036
- Peacock Blue #016795 ΔE 0.037
- Metallic Blue #4F738E ΔE 0.038
- Slate #516572 ΔE 0.044
- Dull Blue #49759C ΔE 0.044
Use #366B8A 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.