#3F646F
Closest named color: Slate (#516572). oklch(48% 0.046 218.6), rgb(63, 100, 111).
Aa
White text reads best on this color (6.43:1).
About this color
#3F646F is a medium-dark, muted teal or cyan. In OKLCH its lightness is 48%, its chroma 0.046 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.024 away. White text reads best on it, at 6.43:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.26:1 |
| White text | 6.43:1 |
Values
| HEX | #3F646F |
| RGB | rgb(63, 100, 111) |
| HSL | hsl(194, 28%, 34%) |
| OKLCH | oklch(48% 0.046 218.6) |
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 #3F646F | 6.43:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #3F646F | 3.26:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #3F646F text on white | 6.43:1 | AA | Lc 81.9 | Fine for body text |
| #3F646F text on black | 3.26:1 | AA large text | Lc -20.0 | 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
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D1DBDF
oklch(88.5% 0.012 223.5)
-
Step 300
300
#B2C4CA
oklch(80.8% 0.021 219.7)
-
Step 400
400
#89A6B0
oklch(70.7% 0.035 220.7)
-
Step 500
500
#6B909C
oklch(63% 0.045 219.8)
-
Step 600
600
#527B87
oklch(55.7% 0.049 218.1)
-
Step 700
700 (this color)
#3F646F
oklch(48% 0.046 218.6)
-
Step 800
800
#37545D
oklch(42.7% 0.038 219.3)
-
Step 900
900
#30464C
oklch(37.8% 0.029 216.5)
-
Step 950
950
#1C292D
oklch(27.1% 0.019 218.7)
#3F646F 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) | #5D6270 | 0.040 |
| Deuteranopia (no green cones) | #555C6F | 0.036 |
| Tritanopia (no blue cones) | #2B6867 | 0.029 |
| Achromatopsia (no color) | #5F5F5F | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F646F
#3F646F
oklch(48% 0.046 218.6)
- #75554B
#75554B
oklch(48% 0.046 38.1)
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 #3F646F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.024
- YInMn Blue #415A77 ΔE 0.037
- Dark Aqua #05696B ΔE 0.041
- Petrol #005F6A ΔE 0.048
- Denim #3B638C ΔE 0.049
- Dusty Grape #545775 ΔE 0.050
- Dark Green Blue #1F6357 ΔE 0.052
- Deep Turquoise #017374 ΔE 0.053
Use #3F646F 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.