#366E8A
Closest named color: Sea Blue (#047495). oklch(51.2% 0.074 232.5), rgb(54, 110, 138).
Aa
White text reads best on this color (5.59:1).
About this color
#366E8A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.074 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.028 away. White text reads best on it, at 5.59:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.75:1 |
| White text | 5.59:1 |
Values
| HEX | #366E8A |
| RGB | rgb(54, 110, 138) |
| HSL | hsl(200, 44%, 38%) |
| OKLCH | oklch(51.2% 0.074 232.5) |
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 #366E8A | 5.59:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #366E8A | 3.75:1 | AA large text | Lc 26.3 | Dividers and decoration only |
| #366E8A text on white | 5.59:1 | AA | Lc 77.8 | Fine for body text |
| #366E8A text on black | 3.75:1 | AA large text | Lc -24.0 | 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
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CDDCE4
oklch(88.6% 0.02 230.7)
-
Step 300
300
#ABC5D4
oklch(80.9% 0.035 233.2)
-
Step 400
400
#7DA7BF
oklch(70.6% 0.057 233.7)
-
Step 500
500
#5A91AE
oklch(63% 0.073 232.6)
-
Step 600
600
#3E7B9A
oklch(55.5% 0.079 232.8)
-
Step 700
700 (this color)
#366E8A
oklch(51.2% 0.074 232.5)
-
Step 800
800
#29556B
oklch(42.8% 0.061 232.4)
-
Step 900
900
#264657
oklch(37.7% 0.048 233.2)
-
Step 950
950
#172933
oklch(27% 0.03 233.8)
#366E8A 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) | #606D8B | 0.049 |
| Deuteranopia (no green cones) | #55648A | 0.043 |
| Tritanopia (no blue cones) | #007677 | 0.052 |
| Achromatopsia (no color) | #686868 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366E8A
#366E8A
oklch(51.2% 0.074 232.5)
- #885A3E
#885A3E
oklch(51.1% 0.073 51.8)
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 #366E8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.028
- Metallic Blue #4F738E ΔE 0.032
- Muted Blue #3B719F ΔE 0.034
- Ocean Blue #03719C ΔE 0.034
- Denim #3B638C ΔE 0.034
- Dull Blue #49759C ΔE 0.040
- Ocean #017B92 ΔE 0.040
- Peacock Blue #016795 ΔE 0.043
Use #366E8A 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.