#3A666B
Closest named color: Slate (#516572). oklch(48.1% 0.049 205), rgb(58, 102, 107).
Aa
White text reads best on this color (6.37:1).
About this color
#3A666B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 48%, its chroma 0.049 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.031 away. White text reads best on it, at 6.37:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.29:1 |
| White text | 6.37:1 |
Values
| HEX | #3A666B |
| RGB | rgb(58, 102, 107) |
| HSL | hsl(186, 30%, 32%) |
| OKLCH | oklch(48.1% 0.049 205) |
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 #3A666B | 6.37:1 | AA | Lc -86.7 | Fine for body text |
| Black text on #3A666B | 3.29:1 | AA large text | Lc 22.4 | Dividers and decoration only |
| #3A666B text on white | 6.37:1 | AA | Lc 81.6 | Fine for body text |
| #3A666B text on black | 3.29:1 | AA large text | Lc -20.3 | 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
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D0DCDD
oklch(88.6% 0.013 202.9)
-
Step 300
300
#B0C5C8
oklch(80.8% 0.023 207.1)
-
Step 400
400
#85A8AC
oklch(70.7% 0.039 204.9)
-
Step 500
500
#669298
oklch(63% 0.049 206.6)
-
Step 600
600
#4C7D82
oklch(55.7% 0.054 204)
-
Step 700
700 (this color)
#3A666B
oklch(48.1% 0.049 205)
-
Step 800
800
#33565A
oklch(42.8% 0.041 205)
-
Step 900
900
#2D474A
oklch(37.8% 0.032 205)
-
Step 950
950
#1B292B
oklch(26.9% 0.019 207.1)
#3A666B 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) | #60636B | 0.049 |
| Deuteranopia (no green cones) | #575C6B | 0.045 |
| Tritanopia (no blue cones) | #236967 | 0.023 |
| Achromatopsia (no color) | #5F5F5F | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A666B
#3A666B
oklch(48.1% 0.049 205)
- #775350
#775350
oklch(48% 0.049 24.4)
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 #3A666B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.031
- Dark Aqua #05696B ΔE 0.032
- Dark Green Blue #1F6357 ΔE 0.043
- Deep Turquoise #017374 ΔE 0.044
- Dark Aquamarine #017371 ΔE 0.045
- Petrol #005F6A ΔE 0.045
- YInMn Blue #415A77 ΔE 0.048
- Deep Aqua #08787F ΔE 0.056
Use #3A666B 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.