#366A63
Closest named color: Dark Aqua (#05696B). oklch(48.6% 0.057 184.2), rgb(54, 106, 99).
Aa
White text reads best on this color (6.17:1).
About this color
#366A63 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 49%, its chroma 0.057 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.030 away. White text reads best on it, at 6.17:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.39:1 |
| White text | 6.17:1 |
Values
| HEX | #366A63 |
| RGB | rgb(54, 106, 99) |
| HSL | hsl(172, 33%, 31%) |
| OKLCH | oklch(48.6% 0.057 184.2) |
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 #366A63 | 6.17:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #366A63 | 3.39:1 | AA large text | Lc 23.4 | Dividers and decoration only |
| #366A63 text on white | 6.17:1 | AA | Lc 80.7 | Fine for body text |
| #366A63 text on black | 3.39:1 | AA large text | Lc -21.2 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4ECEA
oklch(93.6% 0.009 179.6)
-
Step 200
200
#CFDDDA
oklch(88.6% 0.016 181.7)
-
Step 300
300
#AEC7C3
oklch(81% 0.028 185)
-
Step 400
400
#82AAA4
oklch(70.7% 0.044 184.9)
-
Step 500
500
#61958D
oklch(63.1% 0.057 183.8)
-
Step 600
600
#467F77
oklch(55.5% 0.062 184)
-
Step 700
700 (this color)
#366A63
oklch(48.6% 0.057 184.2)
-
Step 800
800
#2F5852
oklch(42.8% 0.047 183.6)
-
Step 900
900
#2A4844
oklch(37.7% 0.037 185.1)
-
Step 950
950
#192A28
oklch(26.9% 0.023 186.7)
#366A63 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) | #666563 | 0.062 |
| Deuteranopia (no green cones) | #5D5E64 | 0.059 |
| Tritanopia (no blue cones) | #1E6C68 | 0.018 |
| Achromatopsia (no color) | #616161 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366A63
#366A63
oklch(48.6% 0.057 184.2)
- #7B525B
#7B525B
oklch(48.6% 0.056 5)
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 #366A63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.030
- Dark Aquamarine #017371 ΔE 0.035
- Dark Green Blue #1F6357 ΔE 0.035
- Deep Turquoise #017374 ΔE 0.036
- Slate #516572 ΔE 0.046
- Bluegreen #017A79 ΔE 0.052
- Deep Aqua #08787F ΔE 0.052
- Petrol #005F6A ΔE 0.054
Use #366A63 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.