#366F78
Closest named color: Deep Turquoise (#017374). oklch(50.7% 0.061 208.9), rgb(54, 111, 120).
Aa
White text reads best on this color (5.67:1).
About this color
#366F78 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 51%, its chroma 0.061 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Turquoise (#017374), ΔE 0.030 away. White text reads best on it, at 5.67:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (51%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Deep Turquoise (#017374) |
| Black text | 3.70:1 |
| White text | 5.67:1 |
Values
| HEX | #366F78 |
| RGB | rgb(54, 111, 120) |
| HSL | hsl(188, 38%, 34%) |
| OKLCH | oklch(50.7% 0.061 208.9) |
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 #366F78 | 5.67:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #366F78 | 3.70:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #366F78 text on white | 5.67:1 | AA | Lc 78.2 | Fine for body text |
| #366F78 text on black | 3.70:1 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CDDCDF
oklch(88.4% 0.017 211)
-
Step 300
300
#ACC6CB
oklch(80.9% 0.029 210.5)
-
Step 400
400
#7EA9B0
oklch(70.6% 0.047 208.6)
-
Step 500
500
#5C949D
oklch(63.1% 0.06 208.7)
-
Step 600
600
#407E88
oklch(55.6% 0.066 209.1)
-
Step 700
700 (this color)
#366F78
oklch(50.7% 0.061 208.9)
-
Step 800
800
#2A575E
oklch(42.8% 0.051 208.7)
-
Step 900
900
#27484D
oklch(37.9% 0.04 208.1)
-
Step 950
950
#172A2D
oklch(27% 0.025 208.4)
#366F78 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) | #676B79 | 0.060 |
| Deuteranopia (no green cones) | #5C6478 | 0.053 |
| Tritanopia (no blue cones) | #027372 | 0.031 |
| Achromatopsia (no color) | #676767 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366F78
#366F78
oklch(50.7% 0.061 208.9)
- #855851
#855851
oklch(50.8% 0.061 29.1)
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 #366F78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Turquoise #017374 ΔE 0.030
- Deep Aqua #08787F ΔE 0.031
- Dark Aquamarine #017371 ΔE 0.032
- Slate #516572 ΔE 0.038
- Bluegreen #017A79 ΔE 0.039
- Dark Aqua #05696B ΔE 0.041
- Metallic Blue #4F738E ΔE 0.047
- Sea Blue #047495 ΔE 0.047
Use #366F78 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.