#366D9F
Closest named color: Muted Blue (#3B719F). oklch(52.1% 0.099 248.2), rgb(54, 109, 159).
Aa
White text reads best on this color (5.46:1).
About this color
#366D9F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.099 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.013 away. White text reads best on it, at 5.46:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.84:1 |
| White text | 5.46:1 |
Values
| HEX | #366D9F |
| RGB | rgb(54, 109, 159) |
| HSL | hsl(209, 49%, 42%) |
| OKLCH | oklch(52.1% 0.099 248.2) |
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 #366D9F | 5.46:1 | AA | Lc -82.4 | Fine for body text |
| Black text on #366D9F | 3.84:1 | AA large text | Lc 27.0 | Dividers and decoration only |
| #366D9F text on white | 5.46:1 | AA | Lc 77.0 | Fine for body text |
| #366D9F text on black | 3.84:1 | AA large text | Lc -24.7 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CCDBEA
oklch(88.5% 0.026 248.1)
-
Step 300
300
#A9C4DF
oklch(80.9% 0.048 248.4)
-
Step 400
400
#7BA5CE
oklch(70.7% 0.076 248.3)
-
Step 500
500
#578EC2
oklch(63% 0.098 248.3)
-
Step 600
600
#3B78AE
oklch(55.7% 0.105 247.7)
-
Step 700
700 (this color)
#366D9F
oklch(52.1% 0.099 248.2)
-
Step 800
800
#275279
oklch(42.7% 0.081 248.2)
-
Step 900
900
#244462
oklch(37.7% 0.064 248.4)
-
Step 950
950
#162839
oklch(27% 0.04 248.2)
#366D9F 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) | #576FA1 | 0.038 |
| Deuteranopia (no green cones) | #49659E | 0.028 |
| Tritanopia (no blue cones) | #00797F | 0.076 |
| Achromatopsia (no color) | #696969 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366D9F
#366D9F
oklch(52.1% 0.099 248.2)
- #8E5D1F
#8E5D1F
oklch(52.1% 0.099 68.2)
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 #366D9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.013
- Flat Blue #3C73A8 ΔE 0.022
- Ocean Blue #03719C ΔE 0.027
- French Blue #436BAD ΔE 0.028
- Dull Blue #49759C ΔE 0.033
- Mid Blue #276AB3 ΔE 0.036
- Denim #3B638C ΔE 0.037
- Sea Blue #047495 ΔE 0.037
Use #366D9F 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.