#366F87
Closest named color: Sea Blue (#047495). oklch(51.3% 0.071 228), rgb(54, 111, 135).
Aa
White text reads best on this color (5.55:1).
About this color
#366F87 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 51%, its chroma 0.071 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.030 away. White text reads best on it, at 5.55:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.78:1 |
| White text | 5.55:1 |
Values
| HEX | #366F87 |
| RGB | rgb(54, 111, 135) |
| HSL | hsl(198, 43%, 37%) |
| OKLCH | oklch(51.3% 0.071 228) |
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 #366F87 | 5.55:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #366F87 | 3.78:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #366F87 text on white | 5.55:1 | AA | Lc 77.6 | Fine for body text |
| #366F87 text on black | 3.78:1 | AA large text | Lc -24.2 | 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
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CDDCE3
oklch(88.5% 0.019 227.3)
-
Step 300
300
#ABC5D2
oklch(80.8% 0.034 229.4)
-
Step 400
400
#7DA8BC
oklch(70.8% 0.055 228.3)
-
Step 500
500
#5A92AB
oklch(63.1% 0.07 228.3)
-
Step 600
600
#3E7C96
oklch(55.6% 0.075 227.8)
-
Step 700
700 (this color)
#366F87
oklch(51.3% 0.071 228)
-
Step 800
800
#285568
oklch(42.6% 0.059 228.1)
-
Step 900
900
#264655
oklch(37.6% 0.046 229.9)
-
Step 950
950
#172932
oklch(27% 0.029 231)
#366F87 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) | #626D88 | 0.051 |
| Deuteranopia (no green cones) | #576487 | 0.047 |
| Tritanopia (no blue cones) | #007677 | 0.047 |
| Achromatopsia (no color) | #686868 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366F87
#366F87
oklch(51.3% 0.071 228)
- #885A43
#885A43
oklch(51.2% 0.07 47.3)
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 #366F87, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.030
- Metallic Blue #4F738E ΔE 0.032
- Ocean Blue #03719C ΔE 0.038
- Ocean #017B92 ΔE 0.038
- Muted Blue #3B719F ΔE 0.039
- Denim #3B638C ΔE 0.039
- Deep Aqua #08787F ΔE 0.040
- Dull Blue #49759C ΔE 0.042
Use #366F87 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.