#406D66
Closest named color: Dark Aquamarine (#017371). oklch(50% 0.051 183.2), rgb(64, 109, 102).
Aa
White text reads best on this color (5.83:1).
About this color
#406D66 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 50%, its chroma 0.051 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aquamarine (#017371), ΔE 0.036 away. White text reads best on it, at 5.83:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Aquamarine (#017371) |
| Black text | 3.59:1 |
| White text | 5.83:1 |
Values
| HEX | #406D66 |
| RGB | rgb(64, 109, 102) |
| HSL | hsl(171, 26%, 34%) |
| OKLCH | oklch(50% 0.051 183.2) |
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 #406D66 | 5.83:1 | AA | Lc -84.4 | Fine for body text |
| Black text on #406D66 | 3.59:1 | AA large text | Lc 24.9 | Dividers and decoration only |
| #406D66 text on white | 5.83:1 | AA | Lc 79.1 | Fine for body text |
| #406D66 text on black | 3.59:1 | AA large text | Lc -22.7 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEA
oklch(93.5% 0.007 185.3)
-
Step 200
200
#D0DCDA
oklch(88.5% 0.013 185.1)
-
Step 300
300
#B0C6C2
oklch(80.9% 0.025 183.6)
-
Step 400
400
#86A9A3
oklch(70.7% 0.039 183.6)
-
Step 500
500
#66948C
oklch(63.1% 0.051 182.6)
-
Step 600
600
#4D7E76
oklch(55.6% 0.055 182.8)
-
Step 700
700 (this color)
#406D66
oklch(50% 0.051 183.2)
-
Step 800
800
#335751
oklch(42.8% 0.043 182.5)
-
Step 900
900
#2D4743
oklch(37.6% 0.033 183.9)
-
Step 950
950
#1B2A27
oklch(27% 0.021 180.8)
#406D66 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) | #696866 | 0.055 |
| Deuteranopia (no green cones) | #616367 | 0.051 |
| Tritanopia (no blue cones) | #2F6F6B | 0.016 |
| Achromatopsia (no color) | #656565 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #406D66
#406D66
oklch(50% 0.051 183.2)
- #7D5760
#7D5760
oklch(50% 0.052 3.5)
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 #406D66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aquamarine #017371 ΔE 0.036
- Deep Turquoise #017374 ΔE 0.038
- Slate #516572 ΔE 0.041
- Dark Aqua #05696B ΔE 0.042
- Bluegreen #017A79 ΔE 0.047
- Deep Aqua #08787F ΔE 0.048
- Dark Green Blue #1F6357 ΔE 0.050
- Dim Gray #696969 ΔE 0.055
Use #406D66 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.