#366C8F
Closest named color: Denim (#3B638C). oklch(51% 0.08 239.4), rgb(54, 108, 143).
Aa
White text reads best on this color (5.67:1).
About this color
#366C8F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.080 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.026 away. White text reads best on it, at 5.67:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.69:1 |
| White text | 5.67:1 |
Values
| HEX | #366C8F |
| RGB | rgb(54, 108, 143) |
| HSL | hsl(204, 45%, 39%) |
| OKLCH | oklch(51% 0.08 239.4) |
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 #366C8F | 5.67:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #366C8F | 3.69:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #366C8F text on white | 5.67:1 | AA | Lc 78.2 | Fine for body text |
| #366C8F text on black | 3.69:1 | AA large text | Lc -23.6 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE6
oklch(88.4% 0.021 241.4)
-
Step 300
300
#ABC5D7
oklch(81% 0.038 238.2)
-
Step 400
400
#7DA6C4
oklch(70.6% 0.063 240.5)
-
Step 500
500
#5B90B4
oklch(63.1% 0.078 239.4)
-
Step 600
600
#3F7AA0
oklch(55.6% 0.085 239.1)
-
Step 700
700 (this color)
#366C8F
oklch(51% 0.08 239.4)
-
Step 800
800
#29546F
oklch(42.7% 0.066 238.5)
-
Step 900
900
#26455A
oklch(37.6% 0.052 239.7)
-
Step 950
950
#172935
oklch(27.1% 0.033 238.8)
#366C8F 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) | #5C6C91 | 0.044 |
| Deuteranopia (no green cones) | #50638E | 0.036 |
| Tritanopia (no blue cones) | #007578 | 0.059 |
| Achromatopsia (no color) | #676767 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366C8F
#366C8F
oklch(51% 0.08 239.4)
- #885A34
#885A34
oklch(50.9% 0.081 59.1)
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 #366C8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.026
- Muted Blue #3B719F ΔE 0.028
- Ocean Blue #03719C ΔE 0.030
- Sea Blue #047495 ΔE 0.030
- Peacock Blue #016795 ΔE 0.035
- Metallic Blue #4F738E ΔE 0.036
- Dull Blue #49759C ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.042
Use #366C8F 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.