#366C91
Closest named color: Muted Blue (#3B719F). oklch(51.1% 0.082 240.9), rgb(54, 108, 145).
Aa
White text reads best on this color (5.65:1).
About this color
#366C91 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.082 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.025 away. White text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #366C91 |
| RGB | rgb(54, 108, 145) |
| HSL | hsl(204, 46%, 39%) |
| OKLCH | oklch(51.1% 0.082 240.9) |
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 #366C91 | 5.65:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #366C91 | 3.71:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #366C91 text on white | 5.65:1 | AA | Lc 78.1 | Fine for body text |
| #366C91 text on black | 3.71:1 | AA large text | Lc -23.7 | 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
#CDDBE7
oklch(88.4% 0.022 243.8)
-
Step 300
300
#ABC5D8
oklch(81% 0.039 239.7)
-
Step 400
400
#7DA6C5
oklch(70.7% 0.064 241.4)
-
Step 500
500
#5A90B6
oklch(63.1% 0.081 240.4)
-
Step 600
600
#3F7AA2
oklch(55.7% 0.088 240.5)
-
Step 700
700 (this color)
#366C91
oklch(51.1% 0.082 240.9)
-
Step 800
800
#295371
oklch(42.6% 0.069 241.9)
-
Step 900
900
#26455B
oklch(37.7% 0.053 241)
-
Step 950
950
#172935
oklch(27.1% 0.033 238.8)
#366C91 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) | #5B6C93 | 0.043 |
| Deuteranopia (no green cones) | #4F6390 | 0.035 |
| Tritanopia (no blue cones) | #007579 | 0.061 |
| Achromatopsia (no color) | #676767 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366C91
#366C91
oklch(51.1% 0.082 240.9)
- #885B32
#885B32
oklch(51.1% 0.082 61.6)
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 #366C91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.025
- Denim #3B638C ΔE 0.026
- Ocean Blue #03719C ΔE 0.028
- Sea Blue #047495 ΔE 0.030
- Peacock Blue #016795 ΔE 0.035
- Metallic Blue #4F738E ΔE 0.037
- Dull Blue #49759C ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.040
Use #366C91 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.