#366A99
Closest named color: Muted Blue (#3B719F). oklch(51% 0.094 248), rgb(54, 106, 153).
Aa
White text reads best on this color (5.70:1).
About this color
#366A99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.094 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.022 away. White text reads best on it, at 5.70:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.67:1 |
| White text | 5.70:1 |
Values
| HEX | #366A99 |
| RGB | rgb(54, 106, 153) |
| HSL | hsl(208, 48%, 41%) |
| OKLCH | oklch(51% 0.094 248) |
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 #366A99 | 5.70:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #366A99 | 3.67:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #366A99 text on white | 5.70:1 | AA | Lc 78.4 | Fine for body text |
| #366A99 text on black | 3.67:1 | AA large text | Lc -23.4 | 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 700.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CDDBE9
oklch(88.5% 0.025 248.1)
-
Step 300
300
#AAC4DD
oklch(80.9% 0.045 247.3)
-
Step 400
400
#7DA5CC
oklch(70.7% 0.072 248.2)
-
Step 500
500
#5A8EBF
oklch(63.1% 0.093 248.1)
-
Step 600
600
#3F78AB
oklch(55.7% 0.1 247.6)
-
Step 700
700 (this color)
#366A99
oklch(51% 0.094 248)
-
Step 800
800
#295277
oklch(42.7% 0.077 247.9)
-
Step 900
900
#264460
oklch(37.7% 0.06 248.1)
-
Step 950
950
#172838
oklch(27% 0.038 247.9)
#366A99 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) | #566C9B | 0.037 |
| Deuteranopia (no green cones) | #486298 | 0.027 |
| Tritanopia (no blue cones) | #00757B | 0.072 |
| Achromatopsia (no color) | #666666 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366A99
#366A99
oklch(51% 0.094 248)
- #895B22
#895B22
oklch(51% 0.094 68.3)
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 #366A99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.022
- Denim #3B638C ΔE 0.025
- Ocean Blue #03719C ΔE 0.029
- Peacock Blue #016795 ΔE 0.032
- Flat Blue #3C73A8 ΔE 0.033
- Dusky Blue #475F94 ΔE 0.033
- French Blue #436BAD ΔE 0.036
- Sea Blue #047495 ΔE 0.038
Use #366A99 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.