#366F63
Closest named color: Dark Aquamarine (#017371). oklch(49.9% 0.064 178.1), rgb(54, 111, 99).
Aa
White text reads best on this color (5.81:1).
About this color
#366F63 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 50%, its chroma 0.064 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aquamarine (#017371), ΔE 0.029 away. White text reads best on it, at 5.81:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Dark Aquamarine (#017371) |
| Black text | 3.61:1 |
| White text | 5.81:1 |
Values
| HEX | #366F63 |
| RGB | rgb(54, 111, 99) |
| HSL | hsl(167, 35%, 32%) |
| OKLCH | oklch(49.9% 0.064 178.1) |
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 #366F63 | 5.81:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #366F63 | 3.61:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #366F63 text on white | 5.81:1 | AA | Lc 78.9 | Fine for body text |
| #366F63 text on black | 3.61:1 | AA large text | Lc -22.9 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E4ECEA
oklch(93.6% 0.009 179.6)
-
Step 200
200
#CEDDD9
oklch(88.5% 0.017 178.2)
-
Step 300
300
#ACC7C0
oklch(80.8% 0.031 178.1)
-
Step 400
400
#80ABA0
oklch(70.7% 0.049 177.3)
-
Step 500
500
#5E9689
oklch(63% 0.063 177.8)
-
Step 600
600
#428173
oklch(55.7% 0.069 177.4)
-
Step 700
700 (this color)
#366F63
oklch(49.9% 0.064 178.1)
-
Step 800
800
#2C594F
oklch(42.9% 0.053 177.4)
-
Step 900
900
#284942
oklch(37.8% 0.041 178.8)
-
Step 950
950
#182B26
oklch(27.1% 0.027 175.7)
#366F63 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) | #6B6963 | 0.067 |
| Deuteranopia (no green cones) | #626264 | 0.065 |
| Tritanopia (no blue cones) | #1C706B | 0.019 |
| Achromatopsia (no color) | #656565 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366F63
#366F63
oklch(49.9% 0.064 178.1)
- #815463
#815463
oklch(50% 0.063 358)
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 #366F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aquamarine #017371 ΔE 0.029
- Deep Turquoise #017374 ΔE 0.032
- Dark Aqua #05696B ΔE 0.039
- Bluegreen #017A79 ΔE 0.042
- Deep Aqua #08787F ΔE 0.045
- Dark Green Blue #1F6357 ΔE 0.046
- Slate #516572 ΔE 0.054
- Teal #008080 ΔE 0.057
Use #366F63 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.