#3F646D
Closest named color: Slate (#516572). oklch(47.9% 0.045 214.8), rgb(63, 100, 109).
Aa
White text reads best on this color (6.45:1).
About this color
#3F646D is a medium-dark, muted teal or cyan. In OKLCH its lightness is 48%, its chroma 0.045 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.025 away. White text reads best on it, at 6.45:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.25:1 |
| White text | 6.45:1 |
Values
| HEX | #3F646D |
| RGB | rgb(63, 100, 109) |
| HSL | hsl(192, 27%, 34%) |
| OKLCH | oklch(47.9% 0.045 214.8) |
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 #3F646D | 6.45:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #3F646D | 3.25:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #3F646D text on white | 6.45:1 | AA | Lc 82.0 | Fine for body text |
| #3F646D text on black | 3.25:1 | AA large text | Lc -19.9 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D1DBDE
oklch(88.5% 0.012 217.6)
-
Step 300
300
#B2C4C9
oklch(80.8% 0.021 216.2)
-
Step 400
400
#89A7AE
oklch(70.8% 0.035 213.5)
-
Step 500
500
#6B919A
oklch(63.2% 0.044 213.9)
-
Step 600
600
#527B85
oklch(55.6% 0.048 214.7)
-
Step 700
700 (this color)
#3F646D
oklch(47.9% 0.045 214.8)
-
Step 800
800
#37545C
oklch(42.6% 0.037 216.9)
-
Step 900
900
#30464B
oklch(37.8% 0.029 213.3)
-
Step 950
950
#1C292C
oklch(27% 0.019 213.5)
#3F646D 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) | #5D626E | 0.040 |
| Deuteranopia (no green cones) | #565C6D | 0.037 |
| Tritanopia (no blue cones) | #2C6867 | 0.026 |
| Achromatopsia (no color) | #5E5E5E | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F646D
#3F646D
oklch(47.9% 0.045 214.8)
- #74554C
#74554C
oklch(48% 0.044 36.8)
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 #3F646D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.025
- YInMn Blue #415A77 ΔE 0.040
- Dark Aqua #05696B ΔE 0.040
- Petrol #005F6A ΔE 0.048
- Dark Green Blue #1F6357 ΔE 0.050
- Dusty Grape #545775 ΔE 0.052
- Deep Turquoise #017374 ΔE 0.052
- Denim #3B638C ΔE 0.052
Use #3F646D 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.